The vehicles we drive are powered by many engine types (and electric motors, of course) — but perhaps two of the most emotive forms of internal combustion engine are the V and flat configurations.

Boxer engines feature flat, opposing pistons that move in opposite directions for smooth operation. Subaru and Porsche are primary modern users, benefiting from low center of gravity and performance.

Most cars on the road today use an inline engine. You'll find them in everything from economy hatchbacks to performance models. In fact, the inline six engine has been making a comeback in recent ...