How to Measure Engine Compression Part 1 of 2
Any time that you make a change to an engine by machining the crankcase or machining the cylinder heads, you change the compression relationships. Today with the limited availability of original pistons and cylinders it means aftermarket pistons are becoming more normal. Combine machine work and the use of aftermarket pistons and it cements the need for accurate compression measurements.
In this video lesson, we show you how to gather the needed measurements from the engine. After showing you how to get the measurements we start an Excel program to work with the numbers.
I would highly recommend working through this lesson so that you are ready for lesson two, where we bring all the numbers into play and you end up with an adaptable engine compression program.
Visit our site for the full write up on this video with the formulas written out.
While you are there check out lots more air-cooled engine goodness.
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Tools you will need
Barrette tube and holder https://amzn.to/3jms5hx
1.25 Piston Deck Height
15.37 Piston Dome Volume
26.36 Chamber Volume
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