Compression Question - 5.3L Heads...
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Compression Question - 5.3L Heads...
Anyone out there know how much compression 5.3L heads milled .015 would make on an LS1?? I'm thinking ~ 11.4:1??
I've got LS1Edit, so I'm thinking I should be able to pull some timing and run that compression on 93octane. Thoughts??
TIA
I've got LS1Edit, so I'm thinking I should be able to pull some timing and run that compression on 93octane. Thoughts??
TIA
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Re: Compression Question - 5.3L Heads...
Hey Fireball. Aprox. What is your CR with .040 off?
444rwhp , What are you calling a small cam?
Thanks!!
444rwhp , What are you calling a small cam?
Thanks!!
232/232 .574/.574 112
#9
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Re: Compression Question - 5.3L Heads...
I may be mis-informed, but I can't see how you guys expect to run todays pump gas with 11.2 to 1 and above compression ratio.
With my TEA 5.3L heads (milled a mere .003"), my CR is 10.8 to 1 (63cc chambers). At that, 92-93 octane pump gas is ok, but pushing it as far as knock retard is concerned.
Sure, you can take some timing out of it with Edit, but there comes a point where there is nothing gained by increasing CR, while pulling timing out of the motor.
Just my opinion,
Ron,
With my TEA 5.3L heads (milled a mere .003"), my CR is 10.8 to 1 (63cc chambers). At that, 92-93 octane pump gas is ok, but pushing it as far as knock retard is concerned.
Sure, you can take some timing out of it with Edit, but there comes a point where there is nothing gained by increasing CR, while pulling timing out of the motor.
Just my opinion,
Ron,
#10
Re: Compression Question - 5.3L Heads...
Well my cam is small by today's standards...was big at one time
You've got to be running valve reliefs in the piston's..Yea???
How did you get the cam in with .040 off the heads?
Thanks alot!!!
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Re: Compression Question - 5.3L Heads...
"I may be mis-informed, but I can't see how you guys expect to run todays pump gas with 11.2 to 1 and above compression ratio. "
why not? i know a few LT1 guys that run at 12.2:1 on 93. i think this general rule or, "myth" as i like to call it, has more to do with your specific application rather than anyone else's opinion. im not bashing, im just saying that if you are good enough to get away with it... go for it.
why not? i know a few LT1 guys that run at 12.2:1 on 93. i think this general rule or, "myth" as i like to call it, has more to do with your specific application rather than anyone else's opinion. im not bashing, im just saying that if you are good enough to get away with it... go for it.
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Re: Compression Question - 5.3L Heads...
I may be mis-informed, but I can't see how you guys expect to run todays pump gas with 11.2 to 1 and above compression ratio.
I pulled 440+ RWHP on 26 degrees.
No KR at all on 93 octane with .040 milled off my 5.3L heads. Then again my dynamic CR is alot lower running a 230+ cam
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Re: Compression Question - 5.3L Heads...
Well my cam is small by today's standards...was big at one time
You've got to be running valve reliefs in the piston's..Yea???
How did you get the cam in with .040 off the heads?
Thanks alot!!!