Raising compression by milling heads
12-16-2002, 05:59 PM
#11
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I believe I will get them surfaced for flatness (.008-.010). This will be the third time of doing that for a total of about .030 removed from virgin castings. If the 1cc/.005 is correct, I will end up with 112cc combustion chambers. This will put my ratio at about 8.37:1. Maybe I can sneak a little more out with head gaskets to get me nearer to 8.5:1.
Thanks fellas. As always, the input is much appreciated!
BT
Thanks fellas. As always, the input is much appreciated!
BT
12-16-2002, 07:32 PM
#12
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BT;
While you are getting some good advice here, I would also want to be sure that the quench area in the motor is right. How far down the hole is the piston at T.D.C.? This measurement added to your headgaskets' compressed thickness will give you quench. To me this is very important to make good power. The quench area is what creates necessary turbulence in the combustion chamber. You want the quench to measure somewhere close to .040" but no less.
While you are getting some good advice here, I would also want to be sure that the quench area in the motor is right. How far down the hole is the piston at T.D.C.? This measurement added to your headgaskets' compressed thickness will give you quench. To me this is very important to make good power. The quench area is what creates necessary turbulence in the combustion chamber. You want the quench to measure somewhere close to .040" but no less.
12-17-2002, 05:27 AM
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Checkmate... that was one thing I kind of gave up on when I figured out I cannot run shim gaskets with aluminum heads. I also am not rebuilding the rotating assemblies this time so cutting the decks is out. I haven't measured yet, but am guessing the piston to deck clearance is the standard .020. If I could locate a shim style gasket for use on aluminum I'd be in good shape. I have closed cooling so corrosion is not a concern. Just can't find the right gasket.
BT
BT
12-19-2002, 04:18 PM
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AMBUSHER .. going with the edelbrocks I have for now. If you post those in the parts section I bet they move quick.
Griff... thanks for the tip on the gaskets. Ordered the 1027. The bird I get my stuff from ordered me some .051 compressed thickness gaskets and I about ****. Needless to say, he has four more of those on his shelf now and some of the1027 inbound. It was nice to be able to tell him the part# I wanted. 1027/1037 drop over a cc off the standard .039 gaskets. Still won't get the ideal compression or quench, but its all working in the right direction.
BT
Griff... thanks for the tip on the gaskets. Ordered the 1027. The bird I get my stuff from ordered me some .051 compressed thickness gaskets and I about ****. Needless to say, he has four more of those on his shelf now and some of the1027 inbound. It was nice to be able to tell him the part# I wanted. 1027/1037 drop over a cc off the standard .039 gaskets. Still won't get the ideal compression or quench, but its all working in the right direction.
BT
