Checking Piston Ring Measurments

One evening I had a little time, so I decided to check the piston ring measurements. First I checked the ring end gap for the first and second rings. The gap is important to ensure the ring doesn't bind up due to heat expansion - of course too large a gap will compromise compression...

All of my rings had a gap of about 0.022"

Measuring piston ring gap for a Porsche 914 engine


Next I measured the clearance of the grooves machined in the pistons - which is about 0.0025"

Measuring piston ring groove clearance on a Porsche 914 engine

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All pictures and text copyright 2008