Using Blair to spec a Cam

General engine tech -- Drag Racing to Circle Track

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GARY C
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Re: Using Blair to spec a Cam

Post by GARY C » Mon May 21, 2018 8:58 pm

hoffman900 wrote:
Mon May 21, 2018 7:23 pm
How much of that 107* LSA was driven by available cam cores? I can't imagine there are any available cast cam cores that could handle that.

An oldie but a goodie: Vizard on 106* LSA vs 112* LSA in a BBC http://www.speedtalk.com/forum/viewtopi ... =1&t=16186

The late Harold Brookshire mentioned grinding 107* LSA BBC cams, but that they were anything but streetable.

I'm not sure where this cam is installed, but no doubt it's tight. 358ci, 7000rpm peak, 9:1 compression. https://www.youtube.com/watch?v=Ne6nsVVykWw

I've been around a lot of cams in the 104-106 centerline area, and they're very lopey and not happy from a dead stop. Make a ton of power in the 5000-7200rpm range (which is what the engines were designed to do).
The 107 was specific to this engine but DV has said you will likely pay more for the core needed to get a tighter LSA on some engines, he sent me a 106 LSA Hyd Roller for my 496 from Howard's and has also recommended Mike Jones for this type of a core as some cam company's don't stock them.

As for street able... DV's street-able and mine or about 10 degrees of overlap apart. :)

This is a 468 right at 600 horse/600 ftlbs with a 268 flat tappet on a 106. https://www.youtube.com/watch?v=QkgbDbmWBKY

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Re: Using Blair to spec a Cam

Post by GARY C » Mon May 21, 2018 9:00 pm

hoffman900 wrote:
Mon May 21, 2018 8:15 pm
Gary,

Hope this helps:
Since Blair uses metric 177.645 = 12.2482 Bars

► BMEP_BARS = 12.2482
► (5.02 * BMEP_BARS + 57.78 ) / 10000 = 0.0119265964s/m (intake pumping)
► (1.7775 * BMEP_BARS + 74.822) / 10000 = 0.009659317549999999s/m (exhaust pumping)
► (4.1185 * BMEP_BARS - 17.985) / 10000 = 0.00324592117s/m (intake overlap)
► (3.0296 * BMEP_BARS - 11.363) / 10000 = 0.002574414672s/m (exhaust overlap)
► (1.6329 * BMEP_BARS - 7.1871) / 10000 = 0.001281298578s/m (exhaust blowndown)
► (2.4022 * BMEP_BARS - 14.57) / 10000 = 0.001485262604s/m (intake ramming)
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Vincenzo,

So 4stHead can export a cam file to show the bounce to be run in a sim program? I like that feature a lot.
Thanks for filling n the blanks, the visual helps the terminology.
Last edited by GARY C on Mon May 21, 2018 9:35 pm, edited 1 time in total.

hoffman900
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Re: Using Blair to spec a Cam

Post by hoffman900 » Mon May 21, 2018 9:14 pm

Stan,

How are you coming up with STA from your valve lift curve? Are you just breaking it up as a percent (so the sum of the intake STA would be "100%", and then you can divy up the area of the valve lift curve that way?).

For example:
► BMEP_BARS = 12.2482
► (5.02 * BMEP_BARS + 57.78 ) / 10000 = 0.0119265964s/m (intake pumping)
► (2.4022 * BMEP_BARS - 14.57) / 10000 = 0.001485262604s/m (intake ramming)
► (4.1185 * BMEP_BARS - 17.985) / 10000 = 0.00324592117s/m (intake overlap)
.0119265964+0.001485262604+.00324592117 = 0.016657780174

Intake Pumping: ~72%
Intake Ramming: ~9%
Intake Overlap: ~19%

Then, taking those proportions of your valve lift area?

With a symmetrical valve lift curve, I would imagine your centerline would be at the 50% point (so half the area is to the left of peak lift, half to the right).

Do you think it would be better to approach the designed valve lift side from the Delivery Ratio, which is proportional to STA?

For those following along, the Delivery Ratio could be thought of as the Cross Sectional Area (so the valve/throat) over the engine speed and volume of the cylinder, at each degree of crank rotation. This will account for the head geometry in your calculations. You could go further by calculating the coefficient of discharge and coming into the Delivery Ratio that way. That will take in the effect of what mass the head can flow.
-Bob

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Re: Using Blair to spec a Cam

Post by Stan Weiss » Mon May 21, 2018 10:00 pm

Because of a limit of how much can be posted in one post. I have broken this into a few piece to show what I do.

Stan

Code: Select all

Pressing the . key will cause this Page to be Written to a Disk File.

C:\Program Files\Microsoft Visual Studio\VB98\CARFOR\test_blis.prm

Bore = 4.35     Stroke = 4.5               Rod Length = 6.7     RPM = 7500
Wrist Pin Offset = 0.0                     Number of - Intake Valves = 1 - Exhaust Valves = 1
Intake Valve Size = 2.23                   Exhaust Valve Size = 1.72
Intake Valve / Bore Ratio = 0.512644       Exhaust Valve / Bore Ratio = 0.395402
Intake Valve Area = 3.905707 sq. in.       Exhaust Valve Area = 2.323522 sq. in.
Intake Valve Stem Size = 0.3415            Exhaust Valve Stem Size = 0.3415
Intake Valve Stem Area = 0.091595 sq. in.  Exhaust Valve Stem Area = 0.091595 sq. in.
Valve Lift at which the Valve Area and Window / Curtain Area are the SAME SIZE
At that point the velocity will be the same in both areas
Intake Valve Lift = 0.5575 Inches          Exhaust Valve Lift = 0.43 Inches
Intake Centerline = 111.0                  User Selected DC - Discharge Coefficient = 0.5
Throat CSA (0.91) Intake = 3.1427 sq. in.  Throat CSA (0.91) Exhaust = 1.8325 sq. in.
Effective Throat CSA = 0.89702             Effective Throat CSA = 0.88808
Valve Lift at which the Throat Area and Window / Curtain Area are the SAME SIZE
At that point the velocity will be the same in both areas
Intake Valve Lift = 0.44859 Inches         Exhaust Valve Lift = 0.33913 Inches
Intake Valve Seat Angle = 45.0             Intake Valve Seat Width = 0.08



       I  N  T  A  K  E
Rocker Arm Ratio = 1.650         Valve Lash = 0.0140         Valve Angle = 14.0
Cam     Valve  Crank    Time    Time     Valve    Valve  Valve  Valve  Piston Cylinder   User           L/D
Lift    Lift   Angle    Port    Port   Velocity Acceler  Lift   Lift   Travel   Volume Supplied Valve  Ratio
                        Area    Area      FPS     ation  Horiz  Vert              cc     Air  Discharge
                        cm^2  cm^2/cc             FPS^2                                  Flow Coefficient
0.0012 -0.0121  -66.0                   0.1359-44994.8886
0.0018 -0.0110  -65.0                   4.1789  18.1934
0.0026 -0.0098  -64.0                   4.5974   1.8836
0.0034 -0.0084  -63.0                   5.0202   1.9023
0.0043 -0.0070  -62.0                   5.4470   1.9207
0.0052 -0.0054  -61.0                   5.8779   1.9390
0.0062 -0.0037  -60.0                   6.3129   1.9577
0.0073 -0.0019  -59.0                   6.7520   1.9761
0.0085  0.0000  -58.0  0.0000  0.0000   7.1953   1.9947 0.0000 0.0000  1.3351  325.158     .00 0.8313 0.0000
0.0097  0.0020  -57.0  0.0020  0.0000   7.6427   2.0131 0.0020 0.0005  1.2958  315.575    1.73 0.8313 0.0009
0.0110  0.0042  -56.0  0.0042  0.0000   8.0942   2.0318 0.0041 0.0010  1.2567  306.060    3.57 0.8313 0.0019
0.0124  0.0065  -55.0  0.0065  0.0000   8.5498   2.0501 0.0063 0.0016  1.2179  296.618    5.50 0.8313 0.0029
0.0139  0.0089  -54.0  0.0089  0.0000   9.0094   2.0685 0.0086 0.0021  1.1795  287.254    7.55 0.8313 0.0040
0.0154  0.0114  -53.0  0.0115  0.0000   9.4733   2.0874 0.0111 0.0028  1.1414  277.971    9.69 0.8313 0.0051
0.0170  0.0141  -52.0  0.0141  0.0000   9.9412   2.1055 0.0136 0.0034  1.1036  268.775   11.95 0.8313 0.0063
0.0187  0.0168  -51.0  0.0169  0.0000  10.4132   2.1239 0.0163 0.0041  1.0662  259.668   14.31 0.8313 0.0075
0.0204  0.0197  -50.0  0.0198  0.0000  10.8894   2.1431 0.0192 0.0048  1.0292  250.657   16.78 0.8313 0.0089
0.0223  0.0228  -49.0  0.0229  0.0000  11.3697   2.1610 0.0221 0.0055  0.9926  241.744   19.35 0.8313 0.0102
0.0242  0.0259  -48.0  0.0260  0.0000  11.8540   2.1796 0.0252 0.0063  0.9565  232.935   22.04 0.8313 0.0116
0.0262  0.0292  -47.0  0.0293  0.0000  12.3425   2.1983 0.0284 0.0071  0.9207  224.232   24.84 0.8313 0.0131
0.0283  0.0326  -46.0  0.0328  0.0000  12.8351   2.2166 0.0317 0.0079  0.8854  215.642   27.75 0.8313 0.0146
0.0304  0.0362  -45.0  0.0364  0.0000  13.3318   2.2353 0.0351 0.0088  0.8506  207.167   30.77 0.8313 0.0162
0.0327  0.0399  -44.0  0.0401  0.0000  13.8327   2.2537 0.0387 0.0096  0.8163  198.812   33.90 0.8313 0.0179
0.0350  0.0437  -43.0  0.0439  0.0000  14.3376   2.2721 0.0424 0.0106  0.7825  190.580   37.15 0.8313 0.0196
0.0374  0.0477  -42.0  0.0479  0.0000  14.8467   2.2910 0.0463 0.0115  0.7493  182.477   40.52 0.8313 0.0214
0.0399  0.0518  -41.0  0.0520  0.0000  15.3597   2.3088 0.0502 0.0125  0.7165  174.505   44.00 0.8313 0.0232
0.0424  0.0560  -40.0  0.0562  0.0001  15.8771   2.3280 0.0543 0.0135  0.6844  166.669   47.60 0.8313 0.0251
0.0451  0.0604  -39.0  0.0606  0.0001  16.3958   2.3344 0.0586 0.0146  0.6528  158.972   51.32 0.8313 0.0271
0.0478  0.0649  -38.0  0.0652  0.0001  16.9055   2.2938 0.0630 0.0157  0.6217  151.418   55.15 0.8313 0.0291
0.0506  0.0695  -37.0  0.0698  0.0001  17.4036   2.2414 0.0675 0.0168  0.5913  144.012   59.09 0.8313 0.0312
0.0535  0.0743  -36.0  0.0746  0.0001  17.8903   2.1899 0.0721 0.0180  0.5615  136.756   63.15 0.8313 0.0333
0.0565  0.0792  -35.0  0.0795  0.0001  18.3651   2.1365 0.0768 0.0192  0.5324  129.654   67.31 0.8313 0.0355
0.0595  0.0842  -34.0  0.0846  0.0001  18.8284   2.0852 0.0817 0.0204  0.5039  122.710   71.58 0.8313 0.0378
0.0626  0.0894  -33.0  0.0897  0.0001  19.2801   2.0326 0.0867 0.0216  0.4760  115.928   75.95 0.8313 0.0401
0.0658  0.0946  -32.0  0.0950  0.0001  19.7201   1.9800 0.0918 0.0229  0.4488  109.309   80.42 0.8313 0.0424
0.0691  0.1000  -31.0  0.1004  0.0001  20.1486   1.9282 0.0970 0.0242  0.4224  102.859   84.99 0.8313 0.0448
0.0724  0.1055  -30.0  0.1059  0.0001  20.5653   1.8753 0.1023 0.0255  0.3966   96.580   89.43 0.8292 0.0473
0.0758  0.1111  -29.0  0.1115  0.0001  20.9706   1.8238 0.1078 0.0269  0.3715   90.475   93.96 0.8274 0.0498
0.0792  0.1168  -28.0  0.1173  0.0001  21.3641   1.7709 0.1133 0.0282  0.3472   84.547   98.57 0.8256 0.0524
0.0828  0.1226  -27.0  0.1231  0.0001  21.7462   1.7191 0.1189 0.0296  0.3236   78.800  103.27 0.8241 0.0550
0.0863  0.1285  -26.0  0.1290  0.0001  22.1164   1.6662 0.1246 0.0311  0.3007   73.235  108.05 0.8226 0.0576
0.0900  0.1344  -25.0  0.1350  0.0001  22.4752   1.6147 0.1305 0.0325  0.2786   67.857  112.90 0.8212 0.0603
0.0937  0.1405  -24.0  0.1412  0.0001  22.8223   1.5620 0.1364 0.0340  0.2573   62.667  117.83 0.8200 0.0630
0.0974  0.1467  -23.0  0.1474  0.0001  23.1578   1.5094 0.1424 0.0355  0.2368   57.669  122.83 0.8188 0.0658
0.1012  0.1530  -22.0  0.1536  0.0001  23.4816   1.4573 0.1484 0.0370  0.2171   52.864  127.91 0.8177 0.0686
0.1050  0.1593  -21.0  0.1600  0.0001  23.7940   1.4056 0.1546 0.0385  0.1981   48.255  133.05 0.8167 0.0714
0.1089  0.1657  -20.0  0.1665  0.0002  24.0946   1.3526 0.1608 0.0401  0.1800   43.845  138.25 0.8157 0.0743
0.1129  0.1722  -19.0  0.1730  0.0002  24.3836   1.3006 0.1671 0.0417  0.1627   39.636  143.52 0.8149 0.0772
0.1169  0.1788  -18.0  0.1796  0.0002  24.6609   1.2480 0.1735 0.0433  0.1463   35.629  148.84 0.8140 0.0802
0.1209  0.1855  -17.0  0.1863  0.0002  24.9268   1.1964 0.1800 0.0449  0.1307   31.828  154.23 0.8132 0.0832
0.1250  0.1922  -16.0  0.1930  0.0002  25.1809   1.1435 0.1865 0.0465  0.1159   28.233  159.67 0.8125 0.0862
0.1291  0.1990  -15.0  0.1998  0.0002  25.4234   1.0915 0.1931 0.0481  0.1020   24.847  165.16 0.8118 0.0892
0.1332  0.2058  -14.0  0.2067  0.0002  25.6544   1.0391 0.1997 0.0498  0.0890   21.671  169.65 0.8062 0.0923
0.1374  0.2127  -13.0  0.2136  0.0002  25.8738   0.9873 0.2064 0.0515  0.0768   18.707  174.00 0.8000 0.0954
0.1416  0.2197  -12.0  0.2206  0.0002  26.0814   0.9342 0.2131 0.0531  0.0655   15.956  178.38 0.7942 0.0985
0.1459  0.2267  -11.0  0.2277  0.0002  26.2774   0.8824 0.2199 0.0548  0.0551   13.421  182.80 0.7887 0.1016
0.1501  0.2337  -10.0  0.2348  0.0002  26.4620   0.8303 0.2268 0.0565  0.0456   11.102  187.24 0.7835 0.1048
0.1544  0.2408   -9.0  0.2419  0.0002  26.6347   0.7774 0.2337 0.0583  0.0370    9.000  191.72 0.7785 0.1080
0.1588  0.2480   -8.0  0.2491  0.0002  26.7960   0.7259 0.2406 0.0600  0.0292    7.116  196.22 0.7739 0.1112
0.1631  0.2552   -7.0  0.2563  0.0002  26.9456   0.6730 0.2476 0.0617  0.0224    5.452  200.75 0.7694 0.1144
0.1675  0.2624   -6.0  0.2635  0.0002  27.0835   0.6206 0.2546 0.0635  0.0165    4.007  205.30 0.7652 0.1177
0.1719  0.2696   -5.0  0.2708  0.0002  27.2100   0.5694 0.2616 0.0652  0.0114    2.784  209.87 0.7612 0.1209
0.1763  0.2769   -4.0  0.2781  0.0003  27.3270   0.5265 0.2687 0.0670  0.0073    1.783  214.46 0.7574 0.1242
0.1807  0.2842   -3.0  0.2855  0.0003  27.4368   0.4939 0.2758 0.0688  0.0041    1.003  219.07 0.7537 0.1275
0.1852  0.2916   -2.0  0.2929  0.0003  27.5392   0.4608 0.2829 0.0705  0.0018     .446  223.70 0.7503 0.1308
0.1897  0.2989   -1.0  0.3003  0.0003  27.6344   0.4285 0.2901 0.0723  0.0005     .111  228.34 0.7470 0.1341
0.1941  0.3063 TDC     0.3077  0.0003  27.7225   0.3962 0.2972 0.0741  0.0000     .000  233.12 0.7442 0.1374
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Re: Using Blair to spec a Cam

Post by Stan Weiss » Mon May 21, 2018 10:02 pm

Part two from 1 ATDC to a couple past ICL.

Stan

Code: Select all

0.1986  0.3138    1.0  0.3151  0.0003  27.8033   0.3636 0.3044 0.0759  0.0005     .111  237.94 0.7416 0.1407
0.2031  0.3212    2.0  0.3226  0.0003  27.8768   0.3308 0.3116 0.0777  0.0018     .446  242.77 0.7392 0.1440
0.2077  0.3286    3.0  0.3301  0.0003  27.9431   0.2985 0.3189 0.0795  0.0041    1.003  247.62 0.7368 0.1474
0.2122  0.3361    4.0  0.3376  0.0003  28.0022   0.2659 0.3261 0.0813  0.0073    1.783  252.47 0.7346 0.1507
0.2167  0.3436    5.0  0.3451  0.0003  28.0541   0.2333 0.3334 0.0831  0.0114    2.784  257.33 0.7324 0.1541
0.2213  0.3511    6.0  0.3526  0.0003  28.0986   0.2005 0.3407 0.0849  0.0165    4.007  262.20 0.7304 0.1574
0.2258  0.3586    7.0  0.3602  0.0003  28.1360   0.1685 0.3479 0.0867  0.0224    5.452  267.08 0.7284 0.1608
0.2304  0.3661    8.0  0.3677  0.0003  28.1662   0.1359 0.3552 0.0886  0.0292    7.116  271.96 0.7265 0.1642
0.2349  0.3736    9.0  0.3753  0.0003  28.1891   0.1027 0.3625 0.0904  0.0370    9.000  276.85 0.7247 0.1675
0.2395  0.3811   10.0  0.3828  0.0003  28.2048   0.0707 0.3698 0.0922  0.0456   11.102  281.74 0.7229 0.1709
0.2440  0.3887   11.0  0.3904  0.0004  28.2132   0.0379 0.3771 0.0940  0.0551   13.421  286.63 0.7212 0.1743
0.2486  0.3962   12.0  0.3979  0.0004  28.2145   0.0058 0.3844 0.0958  0.0655   15.956  291.52 0.7196 0.1777
0.2532  0.4037   13.0  0.4055  0.0004  28.2085  -0.0270 0.3917 0.0977  0.0768   18.707  296.07 0.7172 0.1810
0.2577  0.4112   14.0  0.4130  0.0004  28.1951  -0.0601 0.3990 0.0995  0.0890   21.671  300.28 0.7141 0.1844
0.2623  0.4187   15.0  0.4206  0.0004  28.1748  -0.0916 0.4063 0.1013  0.1020   24.847  304.49 0.7111 0.1878
0.2668  0.4262   16.0  0.4281  0.0004  28.1470  -0.1250 0.4136 0.1031  0.1159   28.233  308.70 0.7083 0.1911
0.2714  0.4337   17.0  0.4356  0.0004  28.1121  -0.1570 0.4209 0.1049  0.1307   31.828  312.89 0.7055 0.1945
0.2759  0.4412   18.0  0.4432  0.0004  28.0699  -0.1899 0.4281 0.1067  0.1463   35.629  317.09 0.7028 0.1979
0.2804  0.4487   19.0  0.4507  0.0004  28.0205  -0.2222 0.4354 0.1085  0.1627   39.636  321.27 0.7002 0.2012
0.2849  0.4562   20.0  0.4582  0.0004  27.9638  -0.2550 0.4426 0.1104  0.1800   43.845  325.45 0.6977 0.2046
0.2895  0.4636   21.0  0.4656  0.0004  27.9000  -0.2873 0.4498 0.1122  0.1981   48.255  329.61 0.6953 0.2079
0.2939  0.4710   22.0  0.4731  0.0004  27.8289  -0.3199 0.4570 0.1139  0.2171   52.864  333.77 0.6930 0.2112
0.2984  0.4784   23.0  0.4805  0.0004  27.7506  -0.3525 0.4642 0.1157  0.2368   57.669  337.91 0.6907 0.2145
0.3029  0.4858   24.0  0.4879  0.0004  27.6650  -0.3851 0.4714 0.1175  0.2573   62.667  342.04 0.6886 0.2178
0.3074  0.4931   25.0  0.4953  0.0005  27.5722  -0.4177 0.4785 0.1193  0.2786   67.857  346.16 0.6865 0.2211
0.3118  0.5005   26.0  0.5027  0.0005  27.4722  -0.4500 0.4856 0.1211  0.3007   73.235  350.47 0.6848 0.2244
0.3162  0.5078   27.0  0.5100  0.0005  27.3648  -0.4831 0.4927 0.1228  0.3236   78.800  357.77 0.6891 0.2277
0.3206  0.5150   28.0  0.5173  0.0005  27.2504  -0.5148 0.4997 0.1246  0.3472   84.547  365.03 0.6931 0.2310
0.3250  0.5223   29.0  0.5246  0.0005  27.1287  -0.5480 0.5068 0.1263  0.3715   90.475  372.27 0.6971 0.2342
0.3294  0.5295   30.0  0.5318  0.0005  26.9997  -0.5803 0.5137 0.1281  0.3966   96.580  379.47 0.7009 0.2374
0.3337  0.5366   31.0  0.5390  0.0005  26.8635  -0.6131 0.5207 0.1298  0.4224  102.859  386.63 0.7046 0.2406
0.3380  0.5438   32.0  0.5462  0.0005  26.7201  -0.6451 0.5276 0.1315  0.4488  109.309  393.76 0.7082 0.2438
0.3423  0.5508   33.0  0.5533  0.0005  26.5694  -0.6783 0.5345 0.1333  0.4760  115.928  400.42 0.7109 0.2470
0.3466  0.5579   34.0  0.5603  0.0005  26.4116  -0.7100 0.5413 0.1350  0.5039  122.710  403.94 0.7081 0.2502
0.3508  0.5649   35.0  0.5674  0.0005  26.2463  -0.7437 0.5481 0.1367  0.5324  129.654  407.44 0.7054 0.2533
0.3551  0.5718   36.0  0.5744  0.0005  26.0741  -0.7749 0.5549 0.1383  0.5615  136.756  410.92 0.7028 0.2564
0.3592  0.5787   37.0  0.5813  0.0005  25.8944  -0.8089 0.5616 0.1400  0.5913  144.012  414.37 0.7002 0.2595
0.3634  0.5856   38.0  0.5882  0.0005  25.7076  -0.8403 0.5682 0.1417  0.6217  151.418  417.80 0.6977 0.2626
0.3675  0.5924   39.0  0.5950  0.0005  25.5136  -0.8732 0.5748 0.1433  0.6528  158.972  421.20 0.6953 0.2657
0.3716  0.5992   40.0  0.6018  0.0005  25.3123  -0.9060 0.5814 0.1449  0.6844  166.669  424.58 0.6930 0.2687
0.3757  0.6058   41.0  0.6085  0.0006  25.1038  -0.9381 0.5878 0.1466  0.7165  174.505  425.58 0.6870 0.2717
0.3797  0.6125   42.0  0.6152  0.0006  24.8880  -0.9712 0.5943 0.1482  0.7493  182.477  426.25 0.6806 0.2747
0.3837  0.6191   43.0  0.6218  0.0006  24.6650  -1.0032 0.6007 0.1498  0.7825  190.580  426.91 0.6744 0.2776
0.3876  0.6256   44.0  0.6283  0.0006  24.4348  -1.0361 0.6070 0.1513  0.8163  198.812  427.56 0.6684 0.2805
0.3915  0.6320   45.0  0.6348  0.0006  24.1974  -1.0684 0.6133 0.1529  0.8506  207.167  428.20 0.6626 0.2834
0.3954  0.6384   46.0  0.6412  0.0006  23.9526  -1.1015 0.6195 0.1544  0.8854  215.642  428.84 0.6569 0.2863
0.3992  0.6447   47.0  0.6476  0.0006  23.7008  -1.1332 0.6256 0.1560  0.9207  224.232  429.47 0.6514 0.2891
0.4030  0.6510   48.0  0.6539  0.0006  23.4416  -1.1664 0.6317 0.1575  0.9565  232.935  430.10 0.6461 0.2919
0.4068  0.6572   49.0  0.6601  0.0006  23.1753  -1.1984 0.6376 0.1590  0.9926  241.744  430.72 0.6410 0.2947
0.4105  0.6633   50.0  0.6662  0.0006  22.9016  -1.2315 0.6436 0.1605  1.0292  250.657  431.33 0.6360 0.2974
0.4141  0.6693   51.0  0.6723  0.0006  22.6208  -1.2635 0.6494 0.1619  1.0662  259.668  431.93 0.6311 0.3001
0.4177  0.6753   52.0  0.6782  0.0006  22.3327  -1.2964 0.6552 0.1634  1.1036  268.775  432.53 0.6264 0.3028
0.4213  0.6811   53.0  0.6841  0.0006  22.0374  -1.3290 0.6609 0.1648  1.1414  277.971  433.11 0.6219 0.3054
0.4248  0.6869   54.0  0.6900  0.0006  21.7348  -1.3616 0.6665 0.1662  1.1795  287.254  433.69 0.6174 0.3080
0.4283  0.6926   55.0  0.6957  0.0006  21.4251  -1.3939 0.6721 0.1676  1.2179  296.618  434.26 0.6131 0.3106
0.4317  0.6983   56.0  0.7014  0.0006  21.1081  -1.4264 0.6775 0.1689  1.2567  306.060  434.83 0.6090 0.3131
0.4350  0.7038   57.0  0.7069  0.0006  20.7838  -1.4593 0.6829 0.1703  1.2958  315.575  435.15 0.6046 0.3156
0.4383  0.7093   58.0  0.7124  0.0007  20.4523  -1.4916 0.6882 0.1716  1.3351  325.158  435.37 0.6003 0.3181
0.4416  0.7146   59.0  0.7178  0.0007  20.1137  -1.5239 0.6934 0.1729  1.3747  334.806  435.59 0.5961 0.3205
0.4448  0.7199   60.0  0.7231  0.0007  19.7677  -1.5570 0.6985 0.1742  1.4146  344.513  435.80 0.5920 0.3228
0.4479  0.7251   61.0  0.7283  0.0007  19.4146  -1.5890 0.7035 0.1754  1.4547  354.276  436.00 0.5881 0.3252
0.4510  0.7302   62.0  0.7334  0.0007  19.0542  -1.6219 0.7085 0.1766  1.4950  364.090  436.21 0.5842 0.3274
0.4540  0.7351   63.0  0.7384  0.0007  18.6865  -1.6545 0.7133 0.1778  1.5355  373.951  436.41 0.5805 0.3297
0.4570  0.7400   64.0  0.7433  0.0007  18.3117  -1.6868 0.7181 0.1790  1.5761  383.855  436.60 0.5770 0.3319
0.4599  0.7448   65.0  0.7481  0.0007  17.9296  -1.7194 0.7227 0.1802  1.6170  393.796  436.79 0.5735 0.3340
0.4627  0.7495   66.0  0.7528  0.0007  17.5403  -1.7519 0.7272 0.1813  1.6579  403.772  436.98 0.5702 0.3361
0.4655  0.7541   67.0  0.7574  0.0007  17.1436  -1.7848 0.7317 0.1824  1.6990  413.776  437.16 0.5670 0.3381
0.4682  0.7585   68.0  0.7619  0.0007  16.7399  -1.8168 0.7360 0.1835  1.7402  423.806  437.34 0.5639 0.3401
0.4708  0.7629   69.0  0.7662  0.0007  16.3288  -1.8499 0.7402 0.1846  1.7815  433.858  437.52 0.5609 0.3421
0.4734  0.7671   70.0  0.7705  0.0007  15.9105  -1.8822 0.7443 0.1856  1.8228  443.925  437.68 0.5580 0.3440
0.4759  0.7713   71.0  0.7747  0.0007  15.4851  -1.9143 0.7483 0.1866  1.8642  454.006  437.85 0.5552 0.3459
0.4783  0.7753   72.0  0.7787  0.0007  15.0523  -1.9477 0.7522 0.1876  1.9056  464.095  438.01 0.5525 0.3477
0.4807  0.7792   73.0  0.7826  0.0007  14.6125  -1.9794 0.7560 0.1885  1.9471  474.188  438.17 0.5500 0.3494
0.4830  0.7829   74.0  0.7864  0.0007  14.1652  -2.0125 0.7597 0.1894  1.9885  484.282  438.32 0.5475 0.3511
0.4852  0.7866   75.0  0.7901  0.0007  13.7108  -2.0451 0.7632 0.1903  2.0299  494.371  438.46 0.5451 0.3527
0.4874  0.7901   76.0  0.7936  0.0007  13.2492  -2.0771 0.7667 0.1911  2.0713  504.454  438.61 0.5429 0.3543
0.4894  0.7935   77.0  0.7970  0.0007  12.7803  -2.1100 0.7700 0.1920  2.1127  514.524  438.74 0.5407 0.3558
0.4914  0.7968   78.0  0.8003  0.0007  12.3042  -2.1426 0.7732 0.1928  2.1540  524.580  438.87 0.5386 0.3573
0.4933  0.8000   79.0  0.8035  0.0007  11.8207  -2.1754 0.7762 0.1935  2.1952  534.616  439.00 0.5367 0.3587
0.4951  0.8030   80.0  0.8065  0.0007  11.3302  -2.2072 0.7791 0.1943  2.2363  544.629  439.06 0.5347 0.3601
0.4969  0.8059   81.0  0.8094  0.0007  10.8324  -2.2403 0.7819 0.1950  2.2773  554.615  439.12 0.5329 0.3614
0.4986  0.8086   82.0  0.8122  0.0007  10.3273  -2.2729 0.7846 0.1956  2.3182  564.572  439.17 0.5311 0.3626
0.5002  0.8113   83.0  0.8148  0.0007   9.8150  -2.3052 0.7872 0.1963  2.3589  574.494  439.23 0.5295 0.3638
0.5017  0.8137   84.0  0.8173  0.0007   9.2955  -2.3378 0.7896 0.1969  2.3995  584.380  439.27 0.5279 0.3649
0.5031  0.8161   85.0  0.8197  0.0007   8.7688  -2.3703 0.7918 0.1974  2.4400  594.224  439.32 0.5265 0.3660
0.5044  0.8183   86.0  0.8219  0.0007   8.2348  -2.4032 0.7940 0.1980  2.4802  604.025  439.37 0.5251 0.3669
0.5056  0.8203   87.0  0.8239  0.0008   7.6937  -2.4349 0.7960 0.1985  2.5202  613.779  439.41 0.5238 0.3679
0.5068  0.8222   88.0  0.8258  0.0008   7.1451  -2.4683 0.7978 0.1989  2.5601  623.482  439.44 0.5227 0.3687
0.5079  0.8240   89.0  0.8276  0.0008   6.5894  -2.5006 0.7995 0.1993  2.5997  633.131  439.48 0.5216 0.3695
0.5088  0.8256   90.0  0.8292  0.0008   6.0266  -2.5327 0.8011 0.1997  2.6391  642.725  439.51 0.5206 0.3702
0.5097  0.8270   91.0  0.8307  0.0008   5.4564  -2.5661 0.8025 0.2001  2.6782  652.258  439.54 0.5197 0.3709
0.5105  0.8283   92.0  0.8320  0.0008   4.8791  -2.5978 0.8037 0.2004  2.7171  661.729  439.57 0.5190 0.3715
0.5112  0.8295   93.0  0.8331  0.0008   4.2945  -2.6307 0.8049 0.2007  2.7558  671.135  439.59 0.5183 0.3720
0.5118  0.8305   94.0  0.8341  0.0008   3.7026  -2.6635 0.8058 0.2009  2.7941  680.473  439.61 0.5177 0.3724
0.5123  0.8313   95.0  0.8350  0.0008   3.1035  -2.6958 0.8066 0.2011  2.8322  689.741  439.63 0.5172 0.3728
0.5127  0.8320   96.0  0.8356  0.0008   2.4972  -2.7284 0.8073 0.2013  2.8699  698.935  439.64 0.5168 0.3731
0.5130  0.8325   97.0  0.8361  0.0008   1.8837  -2.7607 0.8077 0.2014  2.9073  708.054  439.65 0.5165 0.3733
0.5132  0.8328   98.0  0.8365  0.0008   1.2629  -2.7936 0.8081 0.2015  2.9445  717.096  439.66 0.5163 0.3735
0.5133  0.8330   99.0  0.8366  0.0008   0.6349  -2.8261 0.8082 0.2015  2.9813  726.056  439.66 0.5162 0.3735
0.5133  0.8330  100.0  0.8366  0.0008   0.0000  -2.8570 0.8082 0.2015  3.0177  734.935  439.66 0.5162 0.3735
0.5132  0.8328  101.0  0.8365  0.0008  -0.6349  -2.8570 0.8081 0.2015  3.0538  743.729  439.66 0.5163 0.3735
0.5130  0.8325  102.0  0.8361  0.0008  -1.2629  -2.8261 0.8077 0.2014  3.0896  752.436  439.65 0.5165 0.3733
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Re: Using Blair to spec a Cam

Post by Stan Weiss » Mon May 21, 2018 10:07 pm

The last part for the intake from a little after ICL to zero lifter raise is on the report but not shown here. The report also has this same information for the exhaust.

The Max Total CFM / Total CFM is a computer generated count for the page from the Super Flow Manual.

Stan

Code: Select all

Totals               140.7510  0.1284                                                    90058
                                                                Theoretical Cycle VE = 1.41126
    Max Total CFM Sq In Area = Valve Duration @ 0.000 * 146 (Only good if head flow is @ 28" of Water)
    Max Total CFM Sq In Area = 45990.00
    Total CFM Sq In Throat Area = 28655.94
    Total CFM Sq In Net Valve Area (Valve Area - Valve Stem Area) = 23611.68
    Total CFM Sq In Valve Area = 23057.95

Intake BTDC (IVO to TDC) = 7.463
Intake Pumping (TDC to BDC) = 119.310
Intake Ramming (BDC to IVC) = 14.737
Intake Overlap (IVO to EVC) = 35.689

VALVE     Lift      Opens   Closes  Duration
                 Deg BTDC  Deg ABDC             Area
         0.00000    58.00 |  77.00 | 315.00 |  70.07
         0.00200    57.02 |  76.02 | 313.04 |  70.07
         0.00400    56.09 |  75.09 | 311.18 |  70.06
         0.00600    55.21 |  74.21 | 309.42 |  70.06
         0.01000    53.56 |  72.56 | 306.11 |  70.05
         0.02000    49.91 |  68.91 | 298.83 |  69.98
         0.04000    43.97 |  62.97 | 286.94 |  69.80
         0.05000    41.43 |  60.43 | 281.86 |  69.71
         0.10000    31.00 |  50.00 | 260.99 |  68.88
         0.15000    22.47 |  41.47 | 243.95 |  67.87
         0.20000    14.85 |  33.85 | 228.70 |  66.47
         0.25000     7.72 |  26.72 | 214.43 |  64.88
         0.30000     0.86 |  19.86 | 200.72 |  62.94
         0.35000    -5.86 |  13.14 | 187.29 |  60.99
         0.40000   -12.51 |   6.49 | 173.98 |  58.38
         0.45000   -19.17 |  -0.17 | 160.65 |  55.39
         0.50000   -25.94 |  -6.94 | 147.13 |  52.55
         0.55000   -32.88 | -13.88 | 133.24 |  48.89
         0.60000   -40.13 | -21.13 | 118.75 |  44.29
         0.65000   -47.84 | -28.84 | 103.32 |  39.91
         0.70000   -56.31 | -37.31 |  86.38 |  33.84
         0.75000   -66.11 | -47.11 |  66.78 |  26.56
         0.80000   -79.01 | -60.01 |  40.98 |  16.45
CAM
         0.00200    64.77 |  83.77 | 328.53 |  43.83
         0.00400    62.30 |  81.30 | 323.59 |  43.83
         0.00600    60.23 |  79.23 | 319.45 |  43.82
         0.01000    56.79 |  75.79 | 312.57 |  43.79
         0.02000    50.25 |  69.25 | 299.51 |  43.70
         0.04000    40.94 |  59.94 | 280.89 |  43.40
         0.05000    37.22 |  56.22 | 273.44 |  43.27
         0.10000    22.31 |  41.31 | 243.63 |  42.17
         0.15000    10.03 |  29.03 | 219.06 |  40.69
         0.20000    -1.30 |  17.70 | 196.40 |  38.60
         0.25000   -12.31 |   6.69 | 174.38 |  36.12
         0.30000   -23.35 |  -4.35 | 152.30 |  33.08
         0.35000   -34.80 | -15.80 | 129.40 |  29.51
         0.40000   -47.20 | -28.20 | 104.60 |  24.63
         0.45000   -61.67 | -42.67 |  75.66 |  18.66
         0.50000   -82.90 | -63.90 |  33.19 |   8.65

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Re: Using Blair to spec a Cam

Post by Vincenzo » Tue May 22, 2018 5:58 am

Stan

If I understand the reason behind your original post, you are interested to discover if there is any way that meaningful STA values could be arrived at for an engine of a certain performance, in the form of a 'stand alone' computer program.

It may well be possible, but would need to be done so that different poppet valve engine types are handled separately. For instance, five basic categories would comprise DOHC, SOHC, OHV pushrod, flathead and Desmo.

These in turn might require possible further sub division, in the case of the V8 engine according to cylinder head configuration, i.e wedge or hemi, there are also to consider valve arrangements , 2, 3, 4 or 5 per cylinder.

Once the engine type and configuration is determined, then the specific detail leading up to the STA values may be open to calculation.

Here again, the question arises - how to select the best STA value for any particular engine type ?
Working backwards using data from a top performer could be one way.

You could be about to open a kind of Pandora's Box here Stan, but there is also a real possibility that you may be onto an idea that could turn into something rather unique.

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Re: Using Blair to spec a Cam

Post by SchmidtMotorWorks » Tue May 22, 2018 11:22 am

Vincenzo wrote:
Tue May 22, 2018 5:58 am
Stan

If I understand the reason behind your original post, you are interested to discover if there is any way that meaningful STA values could be arrived at for an engine of a certain performance, in the form of a 'stand alone' computer program.

It may well be possible, but would need to be done so that different poppet valve engine types are handled separately. For instance, five basic categories would comprise DOHC, SOHC, OHV pushrod, flathead and Desmo.

These in turn might require possible further sub division, in the case of the V8 engine according to cylinder head configuration, i.e wedge or hemi, there are also to consider valve arrangements , 2, 3, 4 or 5 per cylinder.

Once the engine type and configuration is determined, then the specific detail leading up to the STA values may be open to calculation.

Here again, the question arises - how to select the best STA value for any particular engine type ?
Working backwards using data from a top performer could be one way.

You could be about to open a kind of Pandora's Box here Stan, but there is also a real possibility that you may be onto an idea that could turn into something rather unique.
Exactly^^^^

The concept of how the STA is quantified is one thing
The reference data being compared to is a separate thing.

Comparing to one good engine that is very similar to an engine you plan to build would be better than using some average of many different engines.
http://www.schmidtmotorworks.com Aerospace Machine Work: Prototypes, Tooling, Molds.

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Re: Using Blair to spec a Cam

Post by Stan Weiss » Tue May 22, 2018 1:02 pm

Ron,
Because I had the cam lift data at every 1 crank degrees to create an S96 file I needed to respec and generate a new file. It produced an almost identical results. The ICL has moved .25 degree and both the Intake pumping and Ramming a small amount closer to Blair's. If you cut the data below between the ======= lines and save as an S96. This is the intake lobe data.

Stan

Code: Select all

Intake BTDC (IVO to TDC) = 7.387
Intake Pumping (TDC to BDC) = 119.274
Intake Ramming (BDC to IVC) = 14.853
Intake Overlap (IVO to EVC) = 7.387

VALVE     Lift      Opens   Closes  Duration
                 Deg BTDC  Deg ABDC             Area
         0.00000    57.73 |  77.23 | 314.97 |  70.07
         0.00200    56.77 |  76.27 | 313.04 |  70.07
         0.00400    55.86 |  75.36 | 311.22 |  70.06
         0.00600    54.98 |  74.49 | 309.47 |  70.06
         0.01000    53.35 |  72.85 | 306.20 |  70.05
         0.02000    49.73 |  69.23 | 298.96 |  69.99
         0.04000    43.77 |  63.27 | 287.05 |  69.82
         0.05000    41.21 |  60.72 | 281.93 |  69.70
         0.10000    30.74 |  50.24 | 260.98 |  68.93
         0.15000    22.23 |  41.73 | 243.95 |  67.87
         0.20000    14.59 |  34.09 | 228.69 |  66.57
         0.25000     7.46 |  26.96 | 214.41 |  64.88
         0.30000     0.61 |  20.11 | 200.71 |  63.09
         0.35000    -6.10 |  13.40 | 187.30 |  60.82
         0.40000   -12.75 |   6.75 | 174.00 |  58.38
         0.45000   -19.42 |   0.08 | 160.66 |  55.62
         0.50000   -26.19 |  -6.69 | 147.13 |  52.30
         0.55000   -33.13 | -13.63 | 133.23 |  48.62
         0.60000   -40.38 | -20.88 | 118.74 |  44.59
         0.65000   -48.09 | -28.59 | 103.32 |  39.59
         0.70000   -56.56 | -37.06 |  86.39 |  33.84
         0.75000   -66.36 | -46.86 |  66.78 |  26.94
         0.80000   -79.26 | -59.76 |  40.97 |  16.85
CAM
         0.00200    64.16 |  83.66 | 327.82 |  43.83
         0.00400    61.86 |  81.36 | 323.22 |  43.83
         0.00600    59.88 |  79.39 | 319.27 |  43.82
         0.01000    56.54 |  76.04 | 312.58 |  43.79
         0.02000    50.07 |  69.57 | 299.64 |  43.70
         0.04000    40.73 |  60.23 | 280.96 |  43.42
         0.05000    36.97 |  56.47 | 273.44 |  43.24
         0.10000    22.07 |  41.57 | 243.63 |  42.17
         0.15000     9.77 |  29.27 | 219.05 |  40.62
         0.20000    -1.55 |  17.95 | 196.40 |  38.60
         0.25000   -12.55 |   6.95 | 174.40 |  36.12
         0.30000   -23.60 |  -4.10 | 152.30 |  33.08
         0.35000   -35.05 | -15.55 | 129.39 |  29.34
         0.40000   -47.45 | -27.95 | 104.60 |  24.83
         0.45000   -61.92 | -42.42 |  75.67 |  18.66
         0.50000   -83.16 | -63.66 |  33.18 |   8.40
         
Intake Lobe
===========================
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===========================
Stan Weiss / World Wide Enterprises
Offering Performance Software Since 1987
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Re: Using Blair to spec a Cam

Post by Stan Weiss » Tue May 22, 2018 6:37 pm

Ron,
Here is the exhaust data that can be saved for an S96 file.

Stan

Code: Select all

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Re: Using Blair to spec a Cam

Post by Stan Weiss » Tue May 22, 2018 6:39 pm

If all of these numbers are a little confusing. Maybe a picture will help. This is what a I at this moment.

Stan
ab-blair-pontiac-in-ex-t3.gif
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Re: Using Blair to spec a Cam

Post by Vincenzo » Thu May 24, 2018 4:55 am

Stan
from a perusal of the S96 data and graphics I take it you have not included any ramp design data ?
What you show appears to be the valve lift data only.
I can process this data easily enough to arrive at a valve lift file suitable for used in Vannik's software, but it is impossible to run a dynamic simulation in the Blair software without the full design data, which must include the ramps.

Obviously there is some merit in developing a theoretical valve lift design, but it will only be of real value if said design is fully practical and to this end it must be capable of use in a working engine. The Blair software enables this latter to be fully computed.

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Re: Using Blair to spec a Cam

Post by Stan Weiss » Thu May 24, 2018 10:24 am

Ron,
From the beginning I stated that the lift curve that I came up with would need to be smoothed / adjusted to actually even look good on paper at velocity (see graph below), acceleration, or jerk. I am not a cam designer and do not have the tools to do so. These are basically just some spline curves.

Those files produced the TA I showed using 1.65:1 ratio rocker arms and 0.014" lash on the intake and 0.015" lash on the exhaust.

The graph posted a couple of posts up is the valve lift curve and so has the lash removed. This graph has those same curves (Green and Red lines) but also shows the curves at the valves with lash set at zero (Blue and Cyan lines).

Stan
ab-blair-pontiac-in-ex-t3-no-lash.gif
ab-blair-pontiac-in-ex-t3-vel.gif
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Re: Using Blair to spec a Cam

Post by Stan Weiss » Thu May 24, 2018 2:01 pm

One more try just as an experiment. If anyone just wants to look at the cam lift and duration numbers then you are not seeing the whole picture. While these number are not quite as close as the last set look at how much different the cam number are. This was done with real measured lobes data. Way more rocker arm ratio so I do not know how that would workout.

Stan

Code: Select all

Rocker Arm Ratio = 1.900         Valve Lash = 0.0240

Intake BTDC (IVO to TDC) = 7.399
Intake Pumping (TDC to BDC) = 119.107
Intake Ramming (BDC to IVC) = 14.661
Intake Overlap (IVO to EVC) = 57.195

VALVE     Lift      Opens   Closes  Duration
                 Deg BTDC  Deg ABDC             Area
         0.00000    55.53 |  76.72 | 312.25 |  70.28
         0.00200    54.56 |  75.62 | 310.18 |  70.28
         0.00400    53.63 |  74.58 | 308.21 |  70.27
         0.00600    52.77 |  73.57 | 306.34 |  70.26
         0.01000    51.14 |  71.67 | 302.81 |  70.24
         0.02000    47.52 |  67.46 | 294.98 |  70.17
         0.04000    41.64 |  60.81 | 282.45 |  69.97
         0.05000    39.19 |  58.10 | 277.29 |  69.87
         0.10000    29.25 |  47.50 | 256.76 |  69.00
         0.15000    21.47 |  39.39 | 240.86 |  67.93
         0.20000    14.68 |  32.41 | 227.09 |  66.84
         0.25000     8.40 |  25.97 | 214.37 |  65.20
         0.30000     2.35 |  19.90 | 202.24 |  63.50
         0.35000    -3.62 |  13.93 | 190.31 |  61.49
         0.40000    -9.65 |   7.84 | 178.20 |  59.18
         0.45000   -15.84 |   1.61 | 165.76 |  56.59
         0.50000   -22.28 |  -4.89 | 152.82 |  53.22
         0.55000   -29.21 | -11.80 | 138.99 |  50.02
         0.60000   -36.82 | -19.38 | 123.80 |  45.38
         0.65000   -45.44 | -27.98 | 106.58 |  40.35
         0.70000   -55.70 | -38.24 |  86.06 |  32.87
         0.75000   -69.41 | -51.73 |  58.86 |  23.40
CAM
         0.00200    73.87 |  93.90 | 347.77 |  39.08
         0.00400    67.61 |  88.84 | 336.45 |  39.07
         0.00600    63.76 |  85.20 | 328.96 |  39.04
         0.01000    58.25 |  79.68 | 317.93 |  39.00
         0.02000    49.61 |  69.90 | 299.51 |  38.83
         0.04000    38.73 |  57.60 | 276.33 |  38.48
         0.05000    34.64 |  53.20 | 267.84 |  38.29
         0.10000    19.22 |  37.07 | 236.29 |  37.07
         0.15000     7.05 |  24.61 | 211.67 |  35.53
         0.20000    -4.33 |  13.20 | 188.87 |  33.37
         0.25000   -15.97 |   1.48 | 165.51 |  30.83
         0.30000   -28.64 | -11.23 | 140.13 |  27.21
         0.35000   -43.78 | -26.34 | 109.88 |  22.27
         0.40000   -65.01 | -47.40 |  67.59 |  14.31
 
 ============
Rocker Arm Ratio = 2.020         Valve Lash = 0.0240
 
Exhaust Blow-Down (EVO to BDC) = 5.889
Exhaust Pumping (BDC to TDC) = 96.854
Exhaust ATDC (TDC to EVC) = 12.474
Exhaust Overlap (IVO to EVC) = 40.779

VALVE     Lift      Opens   Closes  Duration
                 Deg BBDC  Deg ATDC             Area
         0.00000    56.17 |  83.05 | 319.22 |  75.20
         0.00200    55.26 |  81.76 | 317.02 |  75.20
         0.00400    54.41 |  80.51 | 314.92 |  75.19
         0.00600    53.60 |  79.32 | 312.92 |  75.19
         0.01000    52.07 |  77.10 | 309.17 |  75.17
         0.02000    48.66 |  72.44 | 301.10 |  75.08
         0.04000    43.08 |  65.27 | 288.34 |  74.92
         0.05000    40.71 |  62.38 | 283.09 |  74.73
         0.10000    31.00 |  51.50 | 262.50 |  73.93
         0.15000    23.23 |  43.29 | 246.53 |  73.02
         0.20000    16.44 |  36.25 | 232.69 |  71.57
         0.25000    10.23 |  29.80 | 220.03 |  70.17
         0.30000     4.30 |  23.69 | 207.99 |  68.47
         0.35000    -1.50 |  17.81 | 196.30 |  66.47
         0.40000    -7.24 |  11.97 | 184.73 |  64.15
         0.45000   -13.04 |   6.06 | 173.02 |  61.53
         0.50000   -19.06 |   0.00 | 160.94 |  58.61
         0.55000   -25.37 |  -6.33 | 148.30 |  55.39
         0.60000   -32.16 | -13.11 | 134.74 |  51.29
         0.65000   -39.61 | -20.56 | 119.83 |  46.87
         0.70000   -48.02 | -29.01 | 102.96 |  40.72
         0.75000   -57.97 | -39.05 |  82.98 |  33.39
         0.80000   -71.44 | -52.35 |  56.21 |  23.24
CAM
         0.00200    71.27 | 105.67 | 356.94 |  39.25
         0.00400    66.41 |  96.58 | 342.99 |  39.22
         0.00600    62.92 |  92.16 | 335.08 |  39.20
         0.01000    58.03 |  85.69 | 323.71 |  39.15
         0.02000    49.83 |  74.01 | 303.84 |  39.00
         0.04000    39.20 |  60.60 | 279.80 |  38.62
         0.05000    35.12 |  56.00 | 271.12 |  38.44
         0.10000    19.33 |  39.25 | 238.58 |  37.24
         0.15000     6.77 |  26.22 | 212.99 |  35.45
         0.20000    -4.95 |  14.31 | 189.36 |  33.47
         0.25000   -16.74 |   2.33 | 165.58 |  30.73
         0.30000   -29.65 | -10.61 | 139.74 |  27.12
         0.35000   -45.02 | -26.01 | 108.97 |  21.84
         0.40000   -66.50 | -47.50 |  65.99 |  13.86
Stan Weiss / World Wide Enterprises
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Re: Using Blair to spec a Cam

Post by maxracesoftware » Thu May 24, 2018 3:47 pm

Stan Weiss wrote:
Thu May 24, 2018 2:01 pm
One more try just as an experiment. If anyone just wants to look at the cam lift and duration numbers then you are not seeing the whole picture. While these number are not quite as close as the last set look at how much different the cam number are. This was done with real measured lobes data. Way more rocker arm ratio so I do not know how that would workout.

Stan

Code: Select all

Rocker Arm Ratio = 1.900         Valve Lash = 0.0240

Intake BTDC (IVO to TDC) = 7.399
Intake Pumping (TDC to BDC) = 119.107
Intake Ramming (BDC to IVC) = 14.661
Intake Overlap (IVO to EVC) = 57.195

VALVE     Lift      Opens   Closes  Duration
                 Deg BTDC  Deg ABDC             Area
         0.00000    55.53 |  76.72 | 312.25 |  70.28
         0.00200    54.56 |  75.62 | 310.18 |  70.28
         0.00400    53.63 |  74.58 | 308.21 |  70.27
         0.00600    52.77 |  73.57 | 306.34 |  70.26
         0.01000    51.14 |  71.67 | 302.81 |  70.24
         0.02000    47.52 |  67.46 | 294.98 |  70.17
         0.04000    41.64 |  60.81 | 282.45 |  69.97
         0.05000    39.19 |  58.10 | 277.29 |  69.87
         0.10000    29.25 |  47.50 | 256.76 |  69.00
         0.15000    21.47 |  39.39 | 240.86 |  67.93
         0.20000    14.68 |  32.41 | 227.09 |  66.84
         0.25000     8.40 |  25.97 | 214.37 |  65.20
         0.30000     2.35 |  19.90 | 202.24 |  63.50
         0.35000    -3.62 |  13.93 | 190.31 |  61.49
         0.40000    -9.65 |   7.84 | 178.20 |  59.18
         0.45000   -15.84 |   1.61 | 165.76 |  56.59
         0.50000   -22.28 |  -4.89 | 152.82 |  53.22
         0.55000   -29.21 | -11.80 | 138.99 |  50.02
         0.60000   -36.82 | -19.38 | 123.80 |  45.38
         0.65000   -45.44 | -27.98 | 106.58 |  40.35
         0.70000   -55.70 | -38.24 |  86.06 |  32.87
         0.75000   -69.41 | -51.73 |  58.86 |  23.40
CAM
         0.00200    73.87 |  93.90 | 347.77 |  39.08
         0.00400    67.61 |  88.84 | 336.45 |  39.07
         0.00600    63.76 |  85.20 | 328.96 |  39.04
         0.01000    58.25 |  79.68 | 317.93 |  39.00
         0.02000    49.61 |  69.90 | 299.51 |  38.83
         0.04000    38.73 |  57.60 | 276.33 |  38.48
         0.05000    34.64 |  53.20 | 267.84 |  38.29
         0.10000    19.22 |  37.07 | 236.29 |  37.07
         0.15000     7.05 |  24.61 | 211.67 |  35.53
         0.20000    -4.33 |  13.20 | 188.87 |  33.37
         0.25000   -15.97 |   1.48 | 165.51 |  30.83
         0.30000   -28.64 | -11.23 | 140.13 |  27.21
         0.35000   -43.78 | -26.34 | 109.88 |  22.27
         0.40000   -65.01 | -47.40 |  67.59 |  14.31
 
 ============
Rocker Arm Ratio = 2.020         Valve Lash = 0.0240
 
Exhaust Blow-Down (EVO to BDC) = 5.889
Exhaust Pumping (BDC to TDC) = 96.854
Exhaust ATDC (TDC to EVC) = 12.474
Exhaust Overlap (IVO to EVC) = 40.779

VALVE     Lift      Opens   Closes  Duration
                 Deg BBDC  Deg ATDC             Area
         0.00000    56.17 |  83.05 | 319.22 |  75.20
         0.00200    55.26 |  81.76 | 317.02 |  75.20
         0.00400    54.41 |  80.51 | 314.92 |  75.19
         0.00600    53.60 |  79.32 | 312.92 |  75.19
         0.01000    52.07 |  77.10 | 309.17 |  75.17
         0.02000    48.66 |  72.44 | 301.10 |  75.08
         0.04000    43.08 |  65.27 | 288.34 |  74.92
         0.05000    40.71 |  62.38 | 283.09 |  74.73
         0.10000    31.00 |  51.50 | 262.50 |  73.93
         0.15000    23.23 |  43.29 | 246.53 |  73.02
         0.20000    16.44 |  36.25 | 232.69 |  71.57
         0.25000    10.23 |  29.80 | 220.03 |  70.17
         0.30000     4.30 |  23.69 | 207.99 |  68.47
         0.35000    -1.50 |  17.81 | 196.30 |  66.47
         0.40000    -7.24 |  11.97 | 184.73 |  64.15
         0.45000   -13.04 |   6.06 | 173.02 |  61.53
         0.50000   -19.06 |   0.00 | 160.94 |  58.61
         0.55000   -25.37 |  -6.33 | 148.30 |  55.39
         0.60000   -32.16 | -13.11 | 134.74 |  51.29
         0.65000   -39.61 | -20.56 | 119.83 |  46.87
         0.70000   -48.02 | -29.01 | 102.96 |  40.72
         0.75000   -57.97 | -39.05 |  82.98 |  33.39
         0.80000   -71.44 | -52.35 |  56.21 |  23.24
CAM
         0.00200    71.27 | 105.67 | 356.94 |  39.25
         0.00400    66.41 |  96.58 | 342.99 |  39.22
         0.00600    62.92 |  92.16 | 335.08 |  39.20
         0.01000    58.03 |  85.69 | 323.71 |  39.15
         0.02000    49.83 |  74.01 | 303.84 |  39.00
         0.04000    39.20 |  60.60 | 279.80 |  38.62
         0.05000    35.12 |  56.00 | 271.12 |  38.44
         0.10000    19.33 |  39.25 | 238.58 |  37.24
         0.15000     6.77 |  26.22 | 212.99 |  35.45
         0.20000    -4.95 |  14.31 | 189.36 |  33.47
         0.25000   -16.74 |   2.33 | 165.58 |  30.73
         0.30000   -29.65 | -10.61 | 139.74 |  27.12
         0.35000   -45.02 | -26.01 | 108.97 |  21.84
         0.40000   -66.50 | -47.50 |  65.99 |  13.86
Stan , you're making good progress !

What Compression Ratio are you plan on using with this either actual or theoretical Engine ?
Meaux Racing Heads
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