An H engine is a piston engine comprising two separate flat engines (complete with separate crankshafts), most often geared to a common output shaft. The name "H engine" is due to the engine blocks resembling a letter "H" when viewed from the front.
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The number of these strokes is equal to the number of cylinders in 4 cylinder engines and hence there is more balance in their operations. While a 4 cylinder engine generates power after every 90-degree rotation of the crankshaft, a 3 cylinder engine makes power after every 120 degrees.5 Jan 2022
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