V4 engines are few and far between(except in motorcycles). It's the reverse situation from 8-cylinder engines, where there are scores of V8s and a count-them-on-one ...

General Motors (GM) is revisiting a technology long thought to be obsolete in the world of cars: the two-stroke engine.

The concept of a five-cylinder engine began as early as the 1930s as a powertrain for agricultural and military equipment, ...

Combustion engines with an odd number of cylinders are not unheard of but are not particularly common, either. Honda‘s just trotted out an interesting one: A V3, so, two pistons on one side and one on ...

It is very rare that i get excited about any alternative technology with huge promises, but this looks really awesome: Oh it probably has been invented a long time ago just it didn't work very well.