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.

You know it when you hear it: the grumbly, all-too-unmistakable sound of an approaching Subaru and its characteristic flat-four-cylinder engine. Since the mid-1960s, the boxer engine has been a ...

The plastic cover of a Subaru Boxer engine showing the Subaru constellation logo - Topuria Design/Shutterstock Flat engines are horizontally-opposed piston engines, and this group includes Boxer ...

Car companies used to have an obsession with the number 12, especially in Formula 1. The siren song of a duodecimal engine has ensnared many an automaker, resulting in shrieking double sixes with ...

Although Subaru didn't invent flat engines, and isn't the only automaker still using them, those motors have become a defining characteristic of the brand. (The same can be said for all-wheel drive, ...

Add Yahoo as a preferred source to see more of our stories on Google. From the eyes of the casual observer, Porsche's entire identity is marked by the flat-6 engine. That's hardly surprising, as it's ...

A straight-twin engine, also called an inline-twin or parallel-twin, is a two-cylinder setup where both cylinders sit side by side, upright, and share a single crankshaft. It's the simplest way to ...

Dear Tom and Ray: I have a question about horizontally opposed, or "boxer," engines. To the best of my knowledge, only Porsche and Subaru use this type of engine design now. Subaru goes so far as to ...

Flat engines are horizontally-opposed piston engines, and this group includes Boxer engines, but not opposed-piston engines like the Cummins 14.3L Advanced Combat Engine (ACE) designed to power tanks.