We love ourselves a good oddball engine, and tiny, scrappy Mazda certainly must be responsible for more such engine concept patents per market-capitalization dollar than any other. We just discovered ...

Every new internal combustion car and truck sold in America today is equipped with a four-stroke engine, as are the vast majority of motorcycles. Today, if you hear the loud, ringing song of a ...

The two-stroke gasoline engine was once a marvel of engineering, offering up huge doses of power in small and lightweight packages. Unfortunately, gas two-strokes also burn oil by design, making them ...

Mazda's willingness to leave the Otto cycle behind when designing its engines brought us the rotary-powered RX-7 and RX-8, ...

Achates Power of San Diego has developed a two-stroke truck diesel that has two crankshafts linked to two opposed pistons facing each other in a common cylinder. The biggest advantage of this design ...

The purpose of your engine is to compress fuel and air and then ignite it, creating heat energy that then makes mechanical motion. If your engine can't compress the air and fuel properly, the engine ...

A fundamental difference between gasoline and diesel engines is that a gasoline engine uses spark ignition while a diesel engine uses compression ignition. Before we delve deeper, let's understand how ...

This paper describes the fundamental principles of operation of a mixture injection system now called the Compression Wave Injection system (CWI). The system has been initially designed for use in ...

Porsche was issued a patent for its six-stroke combustion engine on October 22, 2024. The company describes the new engine as having a "working cycle" of three complete crankshaft revolutions with two ...

As PopMech’s autos editor, I obviously consider myself a car guy. But when it comes to two wheels, the capabilities of modern motorcycles astonish me. We now have road-legal bikes that produce over ...