Jun/Jul 2008

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Reader's Scale Engines

I built this model engine in 1999 from a set of castings and drawings Ted Young was offering at that time. It is a neat little engine of 1-1/2-inch bore by 1-7/8-inch stroke with jump-spark ignition. The cylinder and piston are both cast iron. I turned two grooves for rings on the piston, but I found upon assembly that the engine had such high compression (5.6:1) that I never have installed rings.

I bored the cylinder as near parallel as I could and I honed it with a brake cylinder hone. I then turned the piston to as near the cylinder bore as I could and still just push the piston through the bore. I used Comet cleanser as a lapping compound to get a close fit that would leave just enough room to maintain a film of oil. I have run the engine many times at shows and events in the last four years, and the compression has not decreased.

Paul Brien's scale Young engine.

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