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Compression question

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Old Jan 11, 2007 | 03:48 AM
  #1  
outtacontrolsol's Avatar
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From: Lakenheath, UK
Default Compression question

For S&G, what C/R would I have if I milled my PR3 head 0.030" and got flat faced valves in a JDM B16A. The factory C/R is 10.4:1, how far would these changes raise it?
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Old Jan 11, 2007 | 08:06 AM
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gibsanez's Avatar
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Default Re: Compression question (outtacontrolsol)

You're going to be closer to 11.4 static CR without taking into account the new valves. I'd like to hear how guys feel about taking 30 thou off the head, because you might run into timing issues.
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Old Jan 11, 2007 | 09:13 AM
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Default Re: Compression question (outtacontrolsol)

11.4 to 11.8 sounds about right
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Old Jan 11, 2007 | 01:27 PM
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Default Re: Compression question (LABjunkies)

zealautowerks.com
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Old Jan 11, 2007 | 04:34 PM
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00Red_SiR's Avatar
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Default Re: Compression question (fezzie)

my calculations put you right about 11.5:1
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