EZ Engine-

Here's a simple "wire crank" engine that uses just one small piece of aluminum plate. Crank and rods are built from .093 coat hanger wire. The base, block spacer and main bearing are built from wood. Valve is parallel to the piston and operates 90 degrees out-of-phase to it. "Flywheel" (not shown in sketch or photo) is simply two steel strips bolted together (with crank pinched between them). Valve contains a through hole and ground "flat". Both must be positioned carefully. "Kink" in valve pushrod allows slight bending, to adjust overall length (for tuning purposes).

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PLEASE NOTE: The piston diameter on the print (0.300") is incorrect. - The original intent was to have both the piston and cylinder be 0.200". -- Actually, the best strategy would be to use a #7 drill (0.201") to create the bore and then polish it as best you can. -- To make the piston, turn a piece of 1/4" stock down to around 0.200" and trial-fit. -- Polish the piston with fine paper until it slides smoothly in the bore.---- Thanks to Robert Alfredson for noticing this error. If anyone sees any other errors, please don't hesitate to point them out to me.

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3D image

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Sheet #2 of 2