Correct. I you spend about 20 minutes looking at component weights on the Summit website, this should be evident. The long rod/short piston combos take a lighter bobweight.BrazilianZ28Camaro wrote:A longer rod weights more , than it need heavier crank counterweights...
This difference is offset by a slight lighter piston?
5.7 vs 6.0 Rods
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Note: For the 6" / 152.4 mm rod I increased weight to 600 grams from 570 grams for the 5.7" / 144.78 mm rod
Note: This is with GAS PRESSURE = 0
Note: Since I did not have large and small end weight of the rod I let the program calculate these.
Stan
Edit: Here is 6" / 152.4 mm rod with same weight as 5.7" / 144.78 mm rod
Note: This is with GAS PRESSURE = 0
Note: Since I did not have large and small end weight of the rod I let the program calculate these.
Stan
Code: Select all
Bore = 101.4 Stroke = 90.0 Rod Length = 144.78 RPM = 8000
Crankshaft Degrees at which Rod and Crank are 90 Degrees 72.7339
Crank Piston Crank Rod Cylinder Cylinder
Angle Travel Rod Bore Volume Volume
Degree mm Angle Angle CI cc
-ATDC
90.0000 52.170958 71.89156 18.10844 25.70949 421.30305
Piston Weight = 500.0 Rod Weight = 570.0
Small End Rod Weight = 190.0 Big End Rod Weight = 380.0
Rod CG / Distance from Small End = 96.52
Reciprocating Total Piston Side
Crank Angle Force Force Force
Degree Newtons Newtons Newtons
90.000 -7126.304 13957.749 -2330.397
------------------
Bore = 101.4 Stroke = 90.0 Rod Length = 152.4 RPM = 8000
Crankshaft Degrees at which Rod and Crank are 90 Degrees 73.5494
Crank Piston Crank Rod Cylinder Cylinder
Angle Travel Rod Bore Volume Volume
Degree mm Angle Angle CI cc
-ATDC
90.0000 51.795192 72.82594 17.17406 25.52431 418.26858
Piston Weight = 500.0 Rod Weight = 600.0
Small End Rod Weight = 200.0 Big End Rod Weight = 400.0
Rod CG / Distance from Small End = 101.6
Reciprocating Total Piston Side
Crank Angle Force Force Force
Degree Newtons Newtons Newtons
90.000 -6832.577 14362.423 -2111.647
Code: Select all
Piston Weight = 500.0 Rod Weight = 570.0
Small End Rod Weight = 190.0 Big End Rod Weight = 380.0
Rod CG / Distance from Small End = 101.6
Reciprocating Total Piston Side
Crank Angle Force Force Force
Degree Newtons Newtons Newtons
90.000 -6734.969 13762.062 -2081.481
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Code: Select all
Bore = 101.4 Stroke = 90.0 Rod Length = 144.78 RPM = 8000
Piston Weight = 500.0 Rod Weight = 570.0
Small End Rod Weight = 190.0 Big End Rod Weight = 380.0
Rod CG / Distance from Small End = 96.52
Reciprocating Total Piston Side
Crank Angle Force Force Force
Degree Newtons Newtons Newtons
90.00000000000 -7126.3042027 13957.7491289 -2330.3969332
---------------
Reduce piston weight by 30 grams
Piston Weight = 470.0 Rod Weight = 570.0
Small End Rod Weight = 190.0 Big End Rod Weight = 380.0
Rod CG / Distance from Small End = 96.52
Reciprocating Total Piston Side
Crank Angle Force Force Force
Degree Newtons Newtons Newtons
90.00000000000 -6816.4648895 13802.1281963 -2229.0753274
---------------
Reduce rod weight by 30 grams
Piston Weight = 500.0 Rod Weight = 540.0
Small End Rod Weight = 180.0 Big End Rod Weight = 360.0
Rod CG / Distance from Small End = 96.52
Reciprocating Total Piston Side
Crank Angle Force Force Force
Degree Newtons Newtons Newtons
90.00000000000 -7023.0244316 13363.9394456 -2296.6230646
---------------
Reduce rod weight by 30 grams all on small end
Piston Weight = 500.0 Rod Weight = 540.0
Small End Rod Weight = 160.0 Big End Rod Weight = 380.0
Rod CG / Distance from Small End = 101.8822
Reciprocating Total Piston Side
Crank Angle Force Force Force
Degree Newtons Newtons Newtons
90.00000000000 -6816.4648895 13802.1281963 -2229.0753274