Static Compression Ratio?

ECHO

New Member
Sep 2, 2012
8
2
3
How much power are you guys making with off the shelf GN1 performance stock stroke 4340 rotating assembly? What are your ETs with boost numbers? I have JE pistons with 29cc dish well already which is like 8.5:1 CR. Will a 14 cc dish well volume with custom pistons be better at a 10:1 CR? My goals are to run in the 10's with 550+ horsepower 99% time on the street.
 

pacecarta

MAGNA
Staff member
Aug 1, 2003
9,070
748
113
RIP racewaypark, NJ
mid 9s on je .020 8.5CR pistons ,stock stroke forged external balanced , K1 rods , irons .051 cometics, 215/220 roller and TD 1.55 , ... HP around 820 93+alky drive it anywhere

with 10.1 youll need octane all the time so e85 or race fuel only .. no 93
 
  • Like
Reactions: Mr.Spool and ECHO

ECHO

New Member
Sep 2, 2012
8
2
3
I’m converting to E85 120lb injectors, 450 fuel pump and Teflon lines. I will be upgrading to the TurboTweak ECM.
 
Last edited:

earlbrown

runs with scissors
May 26, 2001
7,062
1,273
113
48
lagrange, GA
With a 29cc dish (on stock castings) you'll never make any real compression. Even if you hit the head.


14 might be a little too small, and it'll most likely knock you out of any quench range.


When I make my pistons (22cc), I start at .040" off the head and see what I've got. 99% of the time that's when I stop. The only time I have to remove compression height is on the case of very small combustion chambers and stroker cranks.
 

Boost231

What's An Intercooler
Staff member
May 26, 2001
14,765
839
113
35
SoCal
www.arizonagn.com
What you have is more than enough for your goals. No need to spend money just to change pistons

Sent from my SM-G950U using Tapatalk
 
  • Like
Reactions: ECHO

Mr.Spool

Well-Known Member
Nov 6, 2006
4,255
542
113
How much power are you guys making with off the shelf GN1 performance stock stroke 4340 rotating assembly? What are your ETs with boost numbers? I have JE pistons with 29cc dish well already which is like 8.5:1 CR. Will a 14 cc dish well volume with custom pistons be better at a 10:1 CR? My goals are to run in the 10's with 550+ horsepower 99% time on the street.
with octane you can run more compression but what you need to understand is higher compression narrows the tuning window,lower compression widens it.more compression drives the turbo easier but with your goals anything would work.
 
  • Like
Reactions: gunzandgearz
Top Bottom