Compression Question - 5.3L Heads...
Thread Starter
10 Second Club
iTrader: (18)
Joined: Aug 2002
Posts: 406
Likes: 0
From: Bloomington, IL
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
Trending Topics
Joined: Nov 2001
Posts: 8,484
Likes: 0
From: Cecil County Raceway!!!
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
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
TECH Fanatic
Joined: Nov 2001
Posts: 1,975
Likes: 2
From: SW Florida
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,
TECH Resident
Joined: Mar 2002
Posts: 770
Likes: 0
From: WA
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!!!
TECH Addict
iTrader: (9)
Joined: Apr 2002
Posts: 2,085
Likes: 0
From: Texas, it's like your state, but better.
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.
Joined: Nov 2001
Posts: 8,484
Likes: 0
From: Cecil County Raceway!!!
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
Joined: Nov 2001
Posts: 8,484
Likes: 0
From: Cecil County Raceway!!!
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!!!
