He says that the power-dense rotary four-stroke engine prototype’s basic architecture is pretty much the same as that of the X2, which shows the scalability of the engines. The X Mini has a 4 lb ...

Designed for hand-held equipment, the GX25 mini 4-stroke engine weighs only 6 pounds and features a .29-kW/kg power-to-rate ratio. It replaces the GX22. Mechanical decompression provides easy start-up ...

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 ...

The Z125 is fitted with a 4-stroke, one-cylinder, SOHC, 2-valve, fuel-injected 125cc air-cooled engine pushing it to a top speed of 64 miles per hour. It's mated to a four-speed manual ...

The NR-200 is a four-stroke water-cooled engine with a displacement of 8.6 cubic centimeters and an electric starter and has an operating range of 3,000-18,000 rpm and a maximum speed of 22,000 rpm.

How hard could it to be to build a two-stroke internal combustion engine (ICE) from scratch? This is a challenge that [Camden Bowen] gladly set for himself, while foregoing such obvious wastes of t… ...

Two-stroke/four-stroke hybrid. The name is so totally nonsensical that neither Jacquot-who brought it up after eavesdropping on some motorcycle geeks-nor I had any idea what it was. He guessed it ...

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.

The Conley Stinger 609 supercharged four-cycle V8 gasoline engine - 6.09 cubic inches and 9.5 horsepower at 10,000 rpm (Photo: Conley Precision Engines) View 19 Images 1 / 19 ...

By design, the six-stroke engine of Porsche's dreams would use a novel operation; the automaker says the process is "six individual strokes that can be divided into two three-stroke sequences." ...