Compression Question
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Cruiser
Joined: May 2008
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Compression Question
I am looking into upgrading to a 95" big bore kit with andrews 37G cams. My question is, I have read alot about the 37G's running real good about 9.7:1 - 9.8:1 compression ratios, all the kits that I have found have pistons with 9.1, 9.3, 10.1 and 10.5 compression ratios, none with 7.8:1. \\;I thought installing say a 10.5:1 piston will give you 10.5:1 comnpression ratio, but after reading dozens of posts I guess it does not. How do you get a 9.7 or 9.8:1 ratio, do you go with certain gaskets, rings, etc. This might be a stupid question but I have never really thought about this before until now. Thanks for your help.
[IMG]local://upfiles/61362/22C59A9A0E05422883A3B65B9CA45A08.jpg[/IMG]
[IMG]local://upfiles/61362/22C59A9A0E05422883A3B65B9CA45A08.jpg[/IMG]
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Joined: Sep 2007
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RE: Compression Question
It's not a stupid question....I think this is something most folks don't have a firm grasp on. \\; You can set your CR by a combination of your piston (flat, dish, or dome), your head chamber volume (the "cc" of the head), and your head gasket.
For example, for a 95" you will have 9.8:1 if you use a true flat top piston, a .030 gasket, and a 81.8cc head. \\; You could do the same with a 5cc dome piston and 86.8cc heads, for example. \\; Any competent head shop can deck the heads to set the desired chamber volume.
For example, for a 95" you will have 9.8:1 if you use a true flat top piston, a .030 gasket, and a 81.8cc head. \\; You could do the same with a 5cc dome piston and 86.8cc heads, for example. \\; Any competent head shop can deck the heads to set the desired chamber volume.
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