Compression?

1306 Views 8 Replies 5 Participants Last post by smblktbolt, Mar 30, 2006

Thordane65

Discussion Starter · Mar 28, 2006

Hey guys... just wondering if someone can do the math for me as to what compression ration I am currently running...

My 306 has cast (ya, I know) flat-top pistons with the stock deck world JR heads...
Chamber volume... 58cc
head gaskets... Fel-Pro 9333PT-1 or 1011-2

Also, depending on what compression I am running, am I able to deck the heads to gain combustion?

THANKS!

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truedog

· #2 · Mar 28, 2006

http://www.angelfire.com/fl/procrastination/motor.html

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Thordane65

Discussion Starter · #3 · Mar 28, 2006

I'm trying to find out how thick those gaskets are... but their website wont tell me. Anyone know?
Thanks

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mstngjoe

· #4 · Mar 28, 2006

http://www.wisespeedshop.com/Fel-Pro.htm

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mikemustang289

· #5 · Mar 28, 2006

the 1011-2 should be .039

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Thordane65

Discussion Starter · #6 · Mar 29, 2006

THANKS!

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smblktbolt

· #7 · Mar 29, 2006

TK, dont forget to take into account your valve reliefs and your piston deck height. they can be pretty out of whack unless you blueprinted the block.

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Thordane65

Discussion Starter · #8 · Mar 29, 2006

Good call.
It works out I am running a 10.451 compression... so thats about the max for me anyway.
Thanks for the tips!

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smblktbolt

· #9 · Mar 30, 2006

remember.... thats the "static" compression ratio. when the engine is running, a big cam will bleed off compression because of overlap. the bigger the cam-the more overlap-the lower your actual "running" ratio.

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