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Registered
Join Date: Jan 2015
Posts: 1,499
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Well, 1.25 is a good deck height, I'd use that. Again, you will not get exactly the same readings around the piston because of the piston rock as a result of the piston/wall clearance. Set your piston dome even with the cyl. top like you did with the straight edge and then measure down to the lip with the caliper and compare that to the .525" that JE says the dome height is.
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05-17-2016, 05:04 AM
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Under the radar
Join Date: May 2007
Location: Fortuna, CA. On the Lost Coast near the Emerald Triangle
Posts: 7,129
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Hijack
My burette finally arrived.
In my case, my 9.5 JE pistons, spec'ed out as specified. Deck height at 1mm with .25 base gaskets.  Here I'm confirming the dome height, .400" or 1.016cm  Here I'm verifying the dome volume. 39.4ml. Spec is 39.8.  With my heads measuring 89ml my CR comes in at 9.8 to 1. Right where I want to be. BTW, I used Excel to do my calcs. Makes it easier to fiddle with the numbers.
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Gordon ___________________________________ '71 911 Coupe 3,0L outlawed #56 PCA Redwood Region, GGR, NASA, Speed SF Trackrash's Garage :: My Garage Last edited by Trackrash; 06-09-2016 at 07:31 PM.. |
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06-09-2016, 07:25 PM
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Under the radar
Join Date: May 2007
Location: Fortuna, CA. On the Lost Coast near the Emerald Triangle
Posts: 7,129
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Forgot to post the spec sheet.
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Gordon ___________________________________ '71 911 Coupe 3,0L outlawed #56 PCA Redwood Region, GGR, NASA, Speed SF Trackrash's Garage :: My Garage |
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06-09-2016, 07:28 PM
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My Garage
1971 Porsche 911
Baja Bug
