The popularity of various engine designs typically fades over time as technological advances provide more power, better fuel economy, or both. Flathead designs gave way to overhead valves, and inline ...

Ford Motor Company's 4-cylinder engines have always been popular with the hot rodding set. Even in the days of the flathead, a beefed-up flattie four Ford was a force to be reckoned with. And as the ...

Four-cylinder engines have been propelling compact and mid-size vehicles for over a century. Compact dimensions, low price, good power, and excellent fuel economy made them the preferred choice for ...

A five-cylinder motorcycle engine isn't common, but MV Agusta’s concept packs serious power, compact packaging, and a ...