What is the highest compression ratio?
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From: Port Tobacco, MD
What is the highest compression ratio? What is the highest compression ratio can you run in an all aluminum LS1 with a big cam and lots of overlap? 232/238 111 lsa XER. If you have run over 11.0:1 post your cam and final compression ratio. 
Phillip
Phillip
Re: What is the highest compression ratio?
When you say how long it lasts, what does that mean? Assuming the car is tuned correctly.
Phillip
Phillip
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From: Hartsdale, NY
Re: What is the highest compression ratio? I'm running 11.4 to 1. .....055 milled heads with a 60cc chamber...car has mild cam 220/220, 564/564, 110 lsa cam
...car is not tuned and runs rich (A-Tap).
NO KNOCK - EVER on 93 octane **** gas.
...car is not tuned and runs rich (A-Tap).
NO KNOCK - EVER on 93 octane **** gas.
Re: What is the highest compression ratio? 12.2:1 CR and a 243/250 cam :-D I run on 91 octane with lots of timing pulled for the street, we dynoed it and it made 465rwhp, for the track it's 28* of timing and 103 octane, which the car made 511rwhp on the dyno.
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From: Port Tobacco, MD
Re: What is the highest compression ratio? LinearVelocity,
What kind of timing do you run on the street?
Fireball,
Have you ever tried race gas and upping the timing?
My setup uses a 232/238 XER 111lsa cam and ~12.0:1cr.
Phillip
What kind of timing do you run on the street?
Fireball,
Have you ever tried race gas and upping the timing?
My setup uses a 232/238 XER 111lsa cam and ~12.0:1cr.
Phillip
Joined: Nov 2001
Posts: 8,484
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From: Cecil County Raceway!!!
Re: What is the highest compression ratio?
Fireball,
Have you ever tried race gas and upping the timing?
Have you ever tried race gas and upping the timing?
Re: What is the highest compression ratio? I don't quite remember off the top of my head, it's either 14* of timing or 18. Anyhow the CR will drop a little as I'm going with a thicker head gasket.
Re: What is the highest compression ratio?
I don't quite remember off the top of my head, it's either 14* of timing or 18. Anyhow the CR will drop a little as I'm going with a thicker head gasket.
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From: new england
Re: What is the highest compression ratio? I run 11.2 to 1 with 93 mobil or 94 sunoco no problem. I run 32* of timing, never any knock even running 3.42 gears all this time.Car weight is min. 3460lbs but i have raced in stock streettrim at 3650lbs still with good tune no problem. My cam is MMS custom grind 220*/220* .585"/.585" lift on a 112* with 2* advance.My compression figures from 62.5cc chambers .042" head gaskets, flat top pistons, stock +.007" deck height. I turn 7000 rpm occasionally with min. shift of 6700 rpm. 
