22R/20R compression ratio?
#3
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Thanx for the response. I was hoping for more than that....Does anybody know if you can use pre '85 donut top pistons with the later lazer block and a 20R head?
#4
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they won't work too well with the lazer block -- it's 3mm higher than the '81-84 block so they lower part of the pistons won't go all the way to the top.
talk to the guys at LC engineering. i know they can mill 20R heads and do some necessary reworking of an oil passage so you can run the head on a lazer block with flat top pistons -- i think that bumps the compression to over 10:1
talk to the guys at LC engineering. i know they can mill 20R heads and do some necessary reworking of an oil passage so you can run the head on a lazer block with flat top pistons -- i think that bumps the compression to over 10:1
#5
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I dunno if this will help or not, but this is the most complete listing of 'specs' regarding the 20/22r that I have found (so far.. I'm still searching).
While it doesn't give the specification of the chamber volume for the head, there is a formula about 2/3 down the page that spells out how to work out the EXACT CR you will have with any given set of specifications.
While it doesn't give the specification of the chamber volume for the head, there is a formula about 2/3 down the page that spells out how to work out the EXACT CR you will have with any given set of specifications.
#6
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Thread Starter
Thanx for the info. I also found a site that states that your compression test #'s should be 17-20 times your compression ratio. This allows for an estimation on CR cause if your compression averages 200psi then that would equal ~10:1 CR. Now if only my bro did not steal my compression tester...doh!
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