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For proper use of this engine in a car you will need to add a bolt on flywheel to the side of the pinion gear comming off the moter. Without this the car will not run properly, a cintripital clutch would also help the car operate by allowing the car to idle.
But if you really want some fun print 5 of these engines and put them in a radial design around the spur gear with the timings offset by 72 degrees. Thus would give for a great sound but also a lot of torque and should help keep the engine (s) running at max efficiency