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It is going to run like a garden tractor, very rough and sputtery. Using only two cylinders in a 4-stroke engine is not dynamically stable. It creates a lot of rocking force in the engine that you will feel as a strong vibration in the car. To make it run properly would require a larger mass flywheel to keep up the crank speed between the widely spaced power strokes. It is not like a 2-stroke engine that fires every revolution. Each cylinder fires once every TWO revolutions.
Bill the Engineer
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