ILLWIN

iTrader: (35)

Alright, thanks in advance for any info, here's what I have:

Comp cams 224/224 .561/.561 110lsa +4 (4deg. of advance ground into camshaft)
Ported and polished LS1 5.7L heads w 2.02/1.60 valves. Heads flowed 273 intake and 199 exhaust. (The same flowbench was used to flow a set of cartek S2 LS1 heads which flowed identical numbers) The heads have been milled .010.
From what I can pull up from doing searches, there's only one more person who has really posted any info on this camshaft. From what I can tell, he installed the cam with a non adjustable timing chain and wound up making like 407/405 with stock heads.

But I also see where others posted recommending to him to retard the cam by about 6-8 degrees and it would make much better power on the top end and not sacrifice much low end at all.

I also know from personal experience that 110 lsa cams build alot of cylinder pressure, I don't think this will be an issue I would need to worry about if I retarded this cam alot, (seeing how I'm only about what, 10.5-10.8 compression) but if you guys think so, please let me know. Also, what is the maximum cranking compession I will want to have while running 93 octane?

On a final note, when all is said and done, this is what I'll have when I strap her down to the dyno:
-the cam
-the heads
-slp longtubes with true duals
-LS6 intake
-LS1 edit tuning
-Stock rockers
-Ported throttle body
Anyone care to take a guess at what she'll put down?

Again, any feedback will be greatly appreciated

arron

ttt....................

ILLWIN

iTrader: (35)

ttt......

GrannySShifting

iTrader: (10)

retard it 4 degrees so it goes in straight up

Larry

iTrader: (4)

Really depends on what maximum rpm you want to take your engine. With this duration a 110 lsa with +4 grounds into it will peak fairly low. I would install it dot to dot and then make a run on the dyno to see where peak hp occurs before you can know exactly where to retard or advance. You have an equivalent of a 106 ICL now. I would guess peak hp would be no more than 6000, maybe a little less if you don't have a very free flowing intake and exhaust.

This cam should make some killer low end torque which is good for launching those M6 trannys. Let us know what set up you find best.

GrannySShifting

iTrader: (10)

yeah itll peak at 5900-6050 Kinda too low for me, not that i like buzzing motors, but Id want as much torque 4700-6200 where the motor will spend its time at. You definitely go thru the traps higher than 5900 if yu have anything other than stock gears

Larry

iTrader: (4)

With that in mind, I think you are going to need a little retard on this cam. Every degree retard will bring your hp/tq up about 50 rpm.

Damian

iTrader: (89)

ILLWIN, you bring up an excellent point about cylinder pressure. Single pattern cams w/ low ICL's will most definately creating SERIOUS cranking compression which can lead to fatal detonation problems....Don't ask me how I know

I'd personally back it up 2 degrees and run it. A 224 on a 108 ICL will make some kick *** low end TQ for the street, but still turn plenty of RPM. Most 224/112 sticks have +4 in them, putting them on a 108 ICL which is pretty common...


josh

ILLWIN

iTrader: (35)

Yeah Josh, your car is where I gained my experience with 110 lsa and high cylinder presssure. I am the guy who worked on your car the day you brought it to LWA. I think yours was like 225 psi, I was thinking I might try to dial mine in around 190 or so?

J-Rod

I'd look at a straight up.

ILLWIN

iTrader: (35)

Thanks for all the info and replies guys

J-rod, thanks for your input, I think you really know your stuff from reading other posts.

So here's my next question-

Since I have 4.10 gears I agree that I want as much torque in my power band under acceleration as possible (I'm not worried about "around town" torque at very low rpm's) so I want to retard this cam as far as a possible with an adjustable timing chain, and therefore bring the powerband up in the rpm range as far as possible. BUT if I retard the cam that far, the cylinder pressure might be so high that I'll have to run much lower ignition timing in order to get rid of detonation.

so I guess my question is this, would I make more hp and torque if I--

#1-Install the cam 4 degrees retarded, which would bring it in to a 110 icl, and would (I'm speculating/guessing here on the cranking compression, so correct me if I'm wrong) have a cranking compression of about 190 psi and probably run around 32-34 degrees of timing for peak power.

OR

#2-Install the cam 6-8 degrees retarded, which would bring the icl to a 112-114 and have a much higher cranking compression, and have to run lower timing for peak power without detonation.

again, thanks for any info.

SSEUL8R

A higher ICL would mean that the intake valve closes later which would equal into lower cranking compression because the cylinder has less time to build compression before TDC.

ILLWIN

iTrader: (35)

SSEUL8R, your right that the higher the ICL, the later the intake valve closing point, but that equals a higher cranking compression by having more time to pull air into the cylinder before the intake valve closes. Compression doesn't start until the piston starts on it's way back up.