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Old 01-17-2013, 08:20 AM
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Buddy: While the summit cast pistons you are using are very good quality, they are a cast piston. You DO NOT WANT TO experiment with DCR theory and seek maximum compression ratio or the limit on your pump gas with these pistons. You want to stay well within the real world limits of the fuel you are using.
You will make excellent horspower power at a reliable practical 10.5:1cr in your engine.
The real gain of pushing it further is VERY VERY small. You will not go faster. Your luck will run out.
Its just a matter of time.
All you will achieve is busting up a perfectly good set of nice pistons and cylinder walls.

How long do you want to go fast till the luck runs out????

The usual typical failure mod when High speed detonation occurs is a broken top ring land, usually right near the intake valve relief.

A more expensive forged piston just takes longer to fail. If it does not break, it distorts the ring lands and scuff the cylinder walls. The engine if *&^%ed either way. It takes about 5 seconds for this to occur @ WOT and YOU WILL NOT HEAR IT.

On a high performance engine that will see WOT running pay close attention to the recomended top ring end gap.
Especially on a hyper piston. More heat load requires a larger top ring end gap. Horsepower is heat load. more heat more often/less time to remove it.

These pistons are Heat efficient.... translated that means the engine often makes maximum power with a bit less than typical spark advance. KB says about 2 less is typical. It also means the rings gap needs to be generous.

Last edited by F-BIRD'88; 01-17-2013 at 08:34 AM.
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