LS1TECH - Camaro and Firebird Forum Discussion

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-   -   Extra CC's when flycutting? (https://ls1tech.com/forums/generation-iii-internal-engine/304522-extra-ccs-when-flycutting.html)

bigdsz 04-11-2005 03:05 PM
Extra CC's when flycutting?
 
How do you figure additional CC's when fly cutting? I will be fly cutting the intake .040-.050 and exhaust .020-.025 and am concerned about how much I will decrease my CR.

DanZ28 04-11-2005 03:20 PM
Are you referring to fly cutting the head deck? I'm kinda lost here, sorry!

jrp 04-11-2005 03:31 PM
Originally Posted by DanZ28
Are you referring to fly cutting the head deck? I'm kinda lost here, sorry!
he means fly cutting the pistons. fly cuts or valve reliefs lower the combustion volume therefore the compression ratio. small fly cuts wont reduce compression much.

DanZ28 04-11-2005 04:11 PM
Originally Posted by jrp
he means fly cutting the pistons. fly cuts or valve reliefs lower the combustion volume therefore the compression ratio. small fly cuts wont reduce compression much.
Ok, I'm an idiot :bang:

Dan

Louis 04-11-2005 07:54 PM
Figure total with both cuts is about 1 CC.

Diamonds with larger cuts are 2CCs.

bigdsz 04-11-2005 07:56 PM
Hey JRP do you think I'd gain over about 1.5 CC combined per piston. I swear I saw something on this in the archives but can't find anything now.

bigdsz 04-11-2005 08:23 PM
Thanks Lou.


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