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This article's lead section may be too short to adequately summarize the key points. Please consider expanding the lead to provide an accessible overview of all important aspects of the article. (January 2024)

X-engine cycle

The red line is a three lobe epitrochoid, which is the shape of the LiquidPiston's swept volume

The X-engine is a type of pistonless rotary engine manufactured by LiquidPiston of Bloomfield, Connecticut.

The X engine is a hybrid cycle rotary engine.