engine gurus
6th Gear Member
Joined: Apr 2007
Posts: 10,468
From: California
I'm running flat tops with 5cc reliefs, 4.100" bore gasket with .039 compressed, 4.04 bore with a 3" stroke and the piston is .006" below the deck, and with a 60cc chamber my compression is only about 9.44:1 If it were 0 decked then it would only be about 9.6:1 and with 0 deck and a 58cc chamber it's still only 9.8:1.
4th Gear Member
Joined: Aug 2007
Posts: 1,235
From: Socal
What compression you tolerate on pump gas has a lot to do with the cam, intake and head selection.
And don't lower compression by using thicker gaskets, it just makes the problem worse. Yeah, you might lower compression by a half a point, but you reduce quench effectiveness which reduces detonation resistance.
And don't lower compression by using thicker gaskets, it just makes the problem worse. Yeah, you might lower compression by a half a point, but you reduce quench effectiveness which reduces detonation resistance.
Thread Starter
5th Gear Member
Joined: Jun 2005
Posts: 2,258
From: So. California
Ive been reading up on quench effectiveness. Looks like running the thicker gasket has the adverse effect to detonation just as 67mustang302 had stated. Had no idea it was so important. Im going to run the 10.8 since the cam was specifically designed for it. If I run into a problem ill address it then. should be fun spinnin it up to 6800 though =)
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