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Milling & Compression Ratios

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Old Jan 4, 2005 | 12:59 PM
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Default Milling & Compression Ratios
How many thousanths are equal to a cc, if i have 73cc heads and want to get 11:1 compression with 2cc valve reliefs .050 gasket and pistons .008 out of the hole how much would i have to mill them.
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Old Jan 4, 2005 | 01:02 PM
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Originally Posted by Juiced
How many thousanths are equal to a cc, if i have 73cc heads and want to get 11:1 compression with 2cc valve reliefs .050 gasket and pistons .008 out of the hole how much would i have to mill them.
https://ls1tech.com/forums/advanced-engineering-tech/111207-ls1-head-combustion-chamber-cc-volume-vs-cr.html

Check there, all the info you will need. However that big a chamber to get that compression ratio is a stretch. What heads are you starting with?

Brandon
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Old Jan 4, 2005 | 01:23 PM
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those are finished chambers after the 2.08 intake and 1.6 exhaust valves.
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Old Jan 4, 2005 | 01:27 PM
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What I have personally seen is for every .006" you take off the head you remove 1cc out of the combustion chamber.
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Old Jan 4, 2005 | 01:36 PM
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so with the following specs i should get 10.7:1 compression

Milled .040
67cc chamber
.050 gasket
1.5 cc valve reliefs
pistons .008 out of the hole
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