Bruce Crower's Six Stroke Engine Prototype

Bruce Crower of Crower Cams, a performance engine parts business, has developed a prototype of a six-stroke engine. The additional strokes are introduced by harnessing otherwise-wasted heat energy, and injecting water into the combusion chamber creates additional power through a "steam stroke." In addition to creating more power, the water also cools the engine, so no extra cooling system is required.

Crower believes his new design could revolutionize engines and provide much more efficient systems -- especially in the area of commercial trucking where vehicles use huge radiators for cooling the engine. He claims that his model increases fuel efficiency by 40%, and that emmissions are lower than conventional engines.