Please help me get a rough idea of my compression ratio.I have a stock forged L82 bottom end w/1 pair of valve reliefs,AFR 65cc heads,fel pro1003 gasket,no decking or milling. I have been running 93 octane with no detonation but i just wanted to be safe. The motor is fresh and has about 30 min of run time. Im trying to break it in easy although its very tempting to go WOT.

 

I'm coming up with around 9.6 to 1. I assumed 6cc piston dish, a .038 gasket and .022 deck height.

Check this site if you want to play some.

http://www.angelfire.com/fl/procrastination/motor.html




JIM

 

I used a .25" down in the hole, .041 gasket and 4cc's for the valve reliefs and came up with 9.65:1 using an excel spreadsheet.

-Mark.

 

thanks guys, so do i need to mix gas to spray 100-150 shot? or with proper timing and plug will i be ok?

 

This should be an intestering set of replies since your CR as indicated by 427HotRod is pretty hi for too much spary (assuming NOS). Typically you'd might want a lower CR but I'm certainly not an expert.