compression and fuel
09-18-2002, 02:00 PM
#2
Supreme Member
Join Date: Jan 2001
Location: Someone owes me 10,000 posts
Posts: 7,164
Likes: 0
Received 1 Like
on
1 Post
Car: 99 Formula
Engine: LS1
Transmission: T56
Axle/Gears: 342
Re: compression and fuel
Originally posted by CHRISMAN2000
If I run 11.1 compression can I get away with running 92 octane?
If I run 11.1 compression can I get away with running 92 octane?
09-19-2002, 02:10 PM
#5
Supreme Member
Around 10:1 +/- a smuggin' is about the limit with cast iron heads. Alumium heads can go about .5 more.
A true 11:1 is pushing it.
There are some variables that will affect the ultamite limit.
And every motor will be a little different.
I'd build for 10.5:1 for alumium heads on 92 octane.
The trouble is,,, having just a little more compression than
*your motor in your car* needs will result in spark knock
which kills power and can damage your motor.
Being slightly under the absolute limit, is not going to hold you back any and you'll go a lot further for longer
A true 11:1 is pushing it.
There are some variables that will affect the ultamite limit.
And every motor will be a little different.
I'd build for 10.5:1 for alumium heads on 92 octane.
The trouble is,,, having just a little more compression than
*your motor in your car* needs will result in spark knock
which kills power and can damage your motor.
Being slightly under the absolute limit, is not going to hold you back any and you'll go a lot further for longer
Thread
Thread Starter
Forum
Replies
Last Post
theshackle
Tech / General Engine
4
03-05-2017 06:37 PM
92camaroJoe
Tech / General Engine
6
08-13-2015 06:07 AM
