Today's low-octane unleaded gas mandates a compression ratio reduction for '60s supercars. The easiest way to lower compression is usually to swap on late-model heads; not only do their larger ...

Legend has it that 30 seconds after Nikolaus Otto, the German engineer credited with developing the conventional four-stroke internal-combustion engine, successfully demonstrated his invention, his ...

Heavy-duty pickups and long-haul trucks rely on torquey diesel engines that are more economical, reliable, durable, and have a more straightforward construction than a comparable unleaded gas engine.