The defining characteristic of a two-stroke engine is to fire (combust) every time the piston is at top dead center. This makes them highly power dense, but also notoriously makes two-stroke engines ...

Volvo Trucks introduces its ultra-low .05 NOx diesel engine, beating 2027 standards. Learn how the new D13 platform fits into their EV and hydrogen plans.

Expanded compatibility adds 7-cylinder radial engines found in classic Cessna, Beech, WACO, and Howard models.

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

The Frankenstein car, powered by a 20-horsepower Kubota D722 diesel engine, boasted 70.1 mpg in a 60-mile road test. Details at Equipment World.

So you've decided to take the leap and add a cat-back exhaust system to your car. Will it work without a tune? Here's what ...

Engines range from 1.2 55 to 1.9 TDI Readers report Real MPG to be between 27–80 mpg 74.3mpg combined is a bold claim for a 1.4 diesel. 83.1 at 56mph is even more remarkable. As, of course, is 99g/km ...