An Opposed Piston Engine with No Crankshaft

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The perfection of the internal combustion engine has been sought for almost 150 years. In the process, some innovative and downright odd designs have emerged.

Granada, Spain-based INNengine has developed an innovative opposed piston design that does away with crankshafts, replacing them with rotary cam tracks, the pistons functioning in a way similar to roller lifters in pushrod overhead valve engines. Mechanical simplicity and light weight are major advantages, as is a unique advantage offered by the cam system: variable compression ratio. The company has prototypes running now, and is developing engines for both automotive and aviation use.

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#innengine #combusionengines #pistons