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Old 12-29-2012, 08:40 PM
Wage92 Wage92 is offline
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Originally Posted by LATECH View Post
Your static compression with that cam and stroke etc will be 11.4 ish to one and the dynamic will be around 9.1 to one. Way to high for any pump gas, and... that is figured with the block decked and a .045 quench height.
Without a good quench , the chamber shape on the heads you have wont do diddly for you. You wont run on pump gas without it detonating itself to death.
If you deck the block, get a good quench,run a slightly larger duration cam, keep the cooling system working very well, keeping the engine at 170 degrees F (or a bit less) you will be on the edge with 92 octane.
Here is a little chart for dynamic comp Vs. octane Vs. temperature
I stare at it for hours sometimes
Also last photo bump
I just said im not decking the block, i dont think its needed. i already calculated my compression and its 10.3 static and 8.35 dynamic. My only question is if .052" quench is too high, i know its not the .040" that people claim is needed but ive seen professionals build engines with higher quench...
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