Jun/Jul 2008

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A Piezo Crystal Furnishes the Ignition

By Paul F. Brien

4312 Lone Oak Road Nashville, Tennessee 37215

A friend of mine gave me this air compressor to convert into a hit and miss engine, an offer I couldn't refuse. It turned out to be NOS, as the hone marks were still evident on the wall of the 17/8 dia. x 1 stroke cylinder. The crankshaft runs in Timken taper roller bearings. I had to weld an extension on the back end of the crankshaft to support the second flywheel, and upon checking the hole in the front cover, I noticed it was around .003 larger all around than the crankshaft passing through it. Then I realized the purpose of that reed type valve on the top of the crankcase: On the down stroke of the piston, air is compressed in the crankcase and this is vented out through the flapper valve, while the vacuum formed inside there, on the upstroke, sucks any oil trying to get out around the cranksh...

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