cdwood37 Posted April 23, 2006 Report Share Posted April 23, 2006 ok i am already running 110 octane race fuel, i just built my motor and want to run pretty high compression because i am running 110 octane with plus 5 timing how high can i go compression wise with the plus 5 timing? Quote Link to comment Share on other sites More sharing options...
Wallrat Posted April 23, 2006 Report Share Posted April 23, 2006 What kinda crank are you running? Quote Link to comment Share on other sites More sharing options...
cdwood37 Posted April 23, 2006 Author Report Share Posted April 23, 2006 a 4mm stroker Quote Link to comment Share on other sites More sharing options...
sheenut05mx Posted April 23, 2006 Report Share Posted April 23, 2006 (edited) I wouldn't run any thing over 155psi 10.5:1 static, any thing higher and you'll want to run 116 octane. Edited April 23, 2006 by sheenut05mx Quote Link to comment Share on other sites More sharing options...
blueshee03 Posted April 23, 2006 Report Share Posted April 23, 2006 ok i am already running 110 octane race fuel, i just built my motor and want to run pretty high compression because i am running 110 octane with plus 5 timing how high can i go compression wise with the plus 5 timing? 506304[/snapback] what is your altitude . one of the main things to take into consideration when determining type of fuel to use with compression and timing is your altitude.remember also ,the higher you go on your compression the more you loose on top end. Quote Link to comment Share on other sites More sharing options...
Ducman Posted April 23, 2006 Report Share Posted April 23, 2006 Depends on how high your exhaust ports have been raised. If you have a doon or drag type port then your static compression will be quite a bit lower. Example: my old motor was a +4mm dune port, exhaust ports raised A LOT. I had 19cc stroker domes, .035 squish, and I was measuring 145 psi when the motor was fresh. I ran +6 timing and could use 100 octane at 400+ ft elevation btu not at sea level. Then I needed 110. I think you could get away with 19cc domes for sure running 110, possibly 18cc. Quote Link to comment Share on other sites More sharing options...
cdwood37 Posted April 23, 2006 Author Report Share Posted April 23, 2006 I am a little above 5000 feet. i am already running 150 psi and the cylinders are cubs and they are factory with a touch up port. Quote Link to comment Share on other sites More sharing options...
fastbanshee4u Posted April 24, 2006 Report Share Posted April 24, 2006 I have run up to 210lbs compression with + 4 timing on aviation gas all summer.Yea the fuel alot of people ,say" its junk".I refuse to spend six dollars a gallon on fuel. Quote Link to comment Share on other sites More sharing options...
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