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That will be right on the edge with iron heads so sneak up on the total timing and don't run it lean!
Just My




I'm running aluminum Stealth heads if that makes a difference. Sorry, should have mentioned that.




Static 9.35 with alum heads , it would probably run on diesel ...


I think kerosene is cheaper, maybe I can use that

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This seems to be a pretty good calculator: http://www.kb-silvolite.com/calc.php?action=comp

I think to be accurate you'll need more info than your post has.

Darren


thanks. I used that one and got the same result. I had read that 8.5:1 is high. I realize that 9.3:1 static is low, but from what I understand, the dynamic number is what really determines if you will have detonation issues or not. I'm still on a learning curve so I'm just trying to gather as much knowledge as possible.




Generally, 8.5 w/al. heads is as high as I would go.

Right or wrong, I shoot for a static CR that gets me around 180 psi cranking and then dial in DCR with duration.