towing heads and cam question

[wyrmrider]

204/210 @.050"
,472"/.450" Valve Lift with 1.6/1.5 rockers
111 LSA
sounds very similar to the one mike ground for me
for an auto trans 85-86 truck that burnt down now in granny gear 4 speed truck
It does work- and much better than the 204-214 budget cam which is downright lazy
if you do go flat tappet you rally need to watch today's oils
I have standard rockers, not roller tip or full roller
not needed but again I might question that choice with today's oils
I like my stereo- so no headers
I also may have the one size smaller cam since I do not have a 400
(that's budget cam when you buy from Jegs or Summit, pricy when you buy same cam in an Edlebrock box
You never get more than what you pay for- In that case you do not get what you pay for
I'm following the head discussion closely I think I have ported 305 HO heads about the same year as the block

[Alan Roehrich]

204/210 @.050"
,472"/.450" Valve Lift with 1.6/1.5 rockers
111 LSA

That is a very mild gentle cam, why would it even need rollers ?

It doesn't. That's his flat tappet grind.

[swatson454]

I suppose I should've been a little more specific on my thoughts.

From Bullet's profiles:
Intake: 259 @ .006, 208 @ .050, 130 @ .200, CTA (conventional nose, asymetrical) lobe profile, .521 lift with 1.6 rockers
Exhaust: 268 -4 (264) @ .006, 210 @ .050, 120 @ .200, CTS (conventional nose, symetrical) lobe profile, .486 lift with 1.6 rockers
108 LSA

I'm guessing Mike widened the LSA for mileage?

[Kenneth Flippen]

How much torque can be produced in towing type application?

http://www.dartheads.com/dartboard/showthread.php?t=760

In the link I posted they made 400hp and over 400ft-lbs of torque cam this kind of power be made 1000 rpm lower I'm cam illiterate so when I see the specs lift is about all that I understand LOL

Mike how much power will be made with the cams already suggested


Kenneth

Here's another build that looks impressive but can it be done 1000 rpm lower

http://www.chevyhiperformance.com/techa ... ck_torque/

[Warpspeed]

It depends on not only the cam, but the rest of the induction/exhaust system.

At some point the power curve peaks and falls over, it just runs out of air.
How high it peaks determines the power potential.
A fairly average figure might be 1 Hp per inch at 6,000 Rpm.
If you built it to peak at only 5,000 rpm, expected power might be roughly 5/6ths of 1 HP per cubic inch.

My guess would be about 335 Hp at 5,000 rpm, or maybe 368 Hp at 5,500 rpm.

[wyrmrider]

OP
what's the gear and tire size
OD trans?
what is your rpm at cruze with the trailer
How important is start up a steep hill fully loaded grunt?
if yes that Howard's cam may be too big
stick or auto

[Kenneth Flippen]

235/85/16 tires
Stick Granny low 4 speed final drive 1:1
I think 4.10 or 4.55 rear end
Cruising is 2000-3000
Plenty of hills but low gear will help there

I think if the cam run out before 5000 it would be fine as long as their is plenty of power before we get to the end



Kenneth

[Alan Roehrich]

You really need to swap in a 5 speed.

[CamKing]

Mike how much power will be made with the cams already suggested

In real HP numbers, not the B.S. numbers in those articals you listed.
The Hydr flat tappet would make about 400 ft/lbs, and 350hp.
The Hydr roller would make about 425 ft/lbs, and 365hp

[wyrmrider]

Mike's cam will make a nice broad torque cure
the reboxed ones I mentioned have extra long seat timing and long ramps to make them idiot proof installs
this gives more real seat overlap and really hurts the bottom end
Mike can fine tune the selection and rocker ratios once you've settled on a head
but I would really stay away from the unknown source cores
there have been several good choices made already
time to put the pencil to the paper
let us know how it turns out
I have a granny gear 4 speed with 4:11s
(was 6 cyl 3 speed truck OEM- bought new in 69)
I put really tall tires on it except when towing

[wyrmrider]

look here
http://www.mellingdurabond.com/Products ... Seats.aspx
I have not tried the copper infused seats but will check them out
I think Dura Bond bought the Washington State Company that was a pioneer (no pun intended) in sintered seats
some "hardened" and "ductile" seats contain very poor base metal
comments appreciated, I'm always looking for more durability

[swatson454]

From Bullet's profiles:
Intake: 259 @ .006, 208 @ .050, 130 @ .200, CTA (conventional nose, asymetrical) lobe profile, .521 lift with 1.6 rockers
Exhaust: 268 -4 (264) @ .006, 210 @ .050, 120 @ .200, CTS (conventional nose, symetrical) lobe profile, .486 lift with 1.6 rockers
108 LSA

I'm guessing Mike widened the LSA for mileage?

Any takers on how this cam will perform? My computer's dead so I lost my sim programs.


Shawn

[wyrmrider]

208 @ 50 was just about what the Dodge 340 H po cam was
how do you think that would work?
We also found that by going only one cam size larger to the "272" cam (but chryslers measures differently so do not compare) in the Direct Connection series 60 foot times doped although MPH went up slightly
to make the 272 cam work a converter and/or gear change was necessary
does that sound like a tow combination to you?
What I'm trying to say is
4 degrees makes a lot of difference
If you want a bigger lobe with grunt seat duration go with the Hyd roller
tight lobe center raises EGT

[swatson454]

208 @ 50 was just about what the Dodge 340 H po cam was
how do you think that would work?
We also found that by going only one cam size larger to the "272" cam (but chryslers measures differently so do not compare) in the Direct Connection series 60 foot times doped although MPH went up slightly
to make the 272 cam work a converter and/or gear change was necessary
does that sound like a tow combination to you?
What I'm trying to say is
4 degrees makes a lot of difference
If you want a bigger lobe with grunt seat duration go with the Hyd roller
tight lobe center raises EGT

I'm not sure if this post was directed at me but I'm not familiar with box-stock, old school, one-size-fits-all cams on different engines and I'm not too big on blanket statements like "tight lobe centers raise EGTs".

What I was hoping to accomplish, and we're just scratching down notes at this point, was to give him something that would give him enough overlap to make some real torque at his anticipated cruise speed that would still be strong on an uphill, downshift and an IVC that would build decent cylinder pressure without having to worry about pulling into some "Sinclare" gas station that's 200 miles from nowhere in any direction that pumps out marine swill.

I honestly don't really care what some less-than-optimal cam did in one engine that it shouldn't have been in compared to the same less-than-optimal cam in another engine that it shouldn't have been in did for performance.

I'm trying to give the OP something that "I" believe would work quite well for his intended use.

Forgive me if I read your post wrong.


Shawn

EdIt: I've done some heavy pulling before and a well-built 700r4 or maybe a 4L80E would be a nice addition to your plan. Locked up in "D" at 2,500 rpm is hard to beat. Then you have OD when you're empty.

[wyrmrider]

swatson
your hyd roller suggestion on the previous page was pretty good but then we did not know he had a non OD stick shift
I should have said overlap not lobecenters
I've lowered EGT 800 degrees with a combination of tight quench and much less overlap even with a compression increase (ok it was propane)
260 @006 is about as big an intake as I'd like to see
I'd prefer 256 and make up for it with higher ratio rockers