The Alpha Otto Rev Force features forced induction, rotary exhaust valves and can run on a variety of different fuels.

Four-stroke engines, which make up 99% of engines on the road, need to breathe: air in during intake, sealed tight during compression and combustion, then air out on exhaust. So we need a system that ...

Keywords engines, heat energy, steam engine, internal combustion, external combustion, reciprocating engine, four-stroke cycle, diesel engine, rotary engine, gas turbine, jet engine, rocket engine ...

In one of its updates about the valve system, the startup said, "There is no external oil being provided to lubricate the rotary valve, except through a 50:1 fuel oil mix used in two-stroke ...

Unlike a four-stroke engine, which musters a single power stroke for every two revolutions of the crankshaft, Porsche's six-stroke affords two power strokes for every three turns of the crank.

I love weird engines—give me a rotary, a turbine, or, hell, even a flat-eight and I’ll be happy. That’s why I was so excited when I heard that INNengine of Granada, Spain had produced a ...

Essentially, it’s a six-stroke engine that relies on a different stroke length for one of the strokes. The first three strokes are very like those in a four-stroke: intake, compression, ignition ...

Most of all, however, the Avadi engine is incredibly compact. The prototype – a 250-cc single-cylinder, the typical displacement of a beginner’s full-sized motorcycle – puts out 15.5 ...

Rotary engines have three power phases instead of just the one of a four-stroke engine. This, along with the way the rotor is mated to the gear of the output shaft, means that for every complete ...