Compression? - Team Camaro Tech
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post #1 of 2 (permalink) Old Mar 24th, 08, 02:52 PM Thread Starter
Senior Tech
Trevor
 
Join Date: May 2006
Location: Winnipeg,Manitoba,Canada
Posts: 172
Compression?

I have been doing a lot of reading posts on compression, quench etc. and this is what I have come up with on my motor. I have L2252AF pistons with a .220 dome and a piston cc of 10.60 This piston specs are with it .025 in the hole not at zero deck height. and a deck height of .020 head gasket of .041 cc's of cylinder heads are 70 and I come up with 11.15 compression ratio. Not the best quench. So tell me am I wrong?
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post #2 of 2 (permalink) Old Mar 24th, 08, 05:12 PM
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Ron
 
Join Date: Nov 2006
Location: North Channel Lake Huron
Posts: 3,934
Re: Compression?

At TDC you say the piston is .025" below Deck Height and you have a .041" thick Gasket which equals .061" Quench. Granted for a cleaner a burn and bigger bang you want somewhere between .035" to no more then .050" Quench - providing you are not using Open chamber heads. Why not use a Steel Shim Head Gasket? They are approx .018" thick. The quench would be .025" + .018" = .038" which is about ideal. This would also up the Static Compression by 1/2 a point to around 11.5:1. You could run a longer duration cam to get the DRC down to a respectable 8 or 8.2:1 - providing the L2252AF are spinning on a 350 Crank. NOTE: Always use Plastercine or alternative method to measure Piston to Valve Clearances when Degreeing the Cam.

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This was my 70 1/2 Z28

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