4.1K views · 47 reactions | For Weird Engine Wednesday, we bring you the Atkinson Cycle engine. You might have seen it in the recent article on GM's new variable displacement patent, but this design allows for a four-cycle engine with fairly traditional parts to have mechanically independent compression and expansion ratios in a single engine. | EngineLabs | Facebook

122K views · 766 reactions | Geoff starts the Atkinson cycle engine for some of today's visitors. | Anson Engine Museum | Facebook

The Atkinson-Cycle engine still has the same four strokes as an Otto-cycle engine, but uses mechanical linkage to have a different intake/compression stroke length than power/exhaust stroke length. Modern variations of the idea can be seen in production engines today. | EngineLabs