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 ...

Some four-cylinder engines use eight spark plugs for better fuel economy, efficiency, and emissions, though they can be ...

While electric and hybrid power trains are leading in the performance race, when it comes to pure internal combustion engines, you'd think the only way to achieve horsepower heaven would be to get a ...

Big, naturally-aspirated engines are cool, but not the only way to generate horses. Engineering and ingenuity give these four ...