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Project Addicted
Join Date: Jul 2012
Location: Eastern Shore. MD
Posts: 919
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Measured deck height today
I got the deck height measured today using just a caliper on the edge of the piston and then using gauging wax (what I've used on the past on my Ducati engines) Sample info here:
cam degreeing and cylinder squish And came up with an averaged height of 1.2mm I went here to enter all info to calculate the compression ratio: Engine Compression Ratio (CR) Calculator  With the piston info on the JE website for these 10.5:1 pistons (I don't have the original paperwork), I get a CR of 9.84. This is with a .25mm shim under the cylinder. With all of the discussions in other threads about quality of gasoline and twin plug, 9.8 seems like a nice safe CR to have on this engine. 3.4, twin plug, JE pistons
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Jon 1966 912 1976 911 3.4 Backdate Project 1986 944 |
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02-22-2015, 10:22 AM
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