Small, ultra-fast, primary and “afterburner” secondary combustion events promise to deliver brake thermal efficiency as high ...

A ny oddball engine is clickbait crack for mechanical nerds, and the most compelling ones purport to introduce an entirely ...

"There is no external oil being provided to lubricate the rotary valve, except through a 50:1 fuel oil mix used in two-stroke applications." Although this is a four-stroke engine, it needs this ...

A patent for a six-stroke engine would normally go directly into our crackpot-engine file, but when the patent filer is Porsche, we feel obligated to examine it further. Unlike a four-stroke ...

A two-stroke engine is fueled by a mixture of gas and oil and has no camshaft or valves. It fires every time the piston reaches the top. A four-stroke engine uses four separate strokes—two 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 ...

Instead, a fairly conventional piston goes up and down in a cylinder, just like in a conventional four-stroke engine ... intake and exhaust “valves” are a simple rotary disc in the cylinder ...

A crankcase ventilation system removes unwanted gases from the crankcase of an internal combustion engine. The system usually consists of a tube, a one-way valve ... four-axis machines manage all ...