 Who has the secret decoder ring for machinist to increase CR? |
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| stugray |
 Jan 13 2012, 05:52 PM
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Advanced Member  Group: Members Posts: 3,824 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None  |
So I converted my car to carbs for vintage racing and have the Raby race cam.
I know I need to increase my compression ratio to make this work out. Who has the numbers for "Cut 'X' from the combustion chamber to get 'Y' compression ratio? I have measured my deck height and CCd my heads and everything I have now appears to be exactly stock. Someone has done this before. I have a machinist that can flycut the heads (they are in great shape), but he wants me to tell him exactly how much to take them down. I am targeting a 9.5:1 for now with the stock "slightly dished" 94mm pistons. I can get a little more increase by switching to flat tops if I want. Stu |
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Posts in this topic
stugray Who has the secret decoder ring for machinist to increase CR? Jan 13 2012, 05:52 PM
Dr Evil I just tend to google CR calc.
This one should be ... Jan 13 2012, 06:27 PM 76-914 Here's one. http://www.aircooledtech.com... Jan 13 2012, 06:43 PM Don M you can expect to lower standard chamber volume ve... Jan 14 2012, 09:16 AM
Mark Henry Try to change the CR with shims first. I would set... Jan 14 2012, 09:59 AM  |
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