From Panhead legends to Shovelhead workhorses, vintage Harley-Davidsons and other heritage motorcycles are more than machines — they’re rolling pieces of history. But changing fuel standards, ...

Despite its critics and moves toward electrification, the internal combustion engine is not yet dead. Though its design for passenger vehicles may have begun to reach its apex with Mazda’s Skyactiv ...

Harley-Davidson first introduced the Electra Glide back in 1965, and with it came a newfangled invention: the traditional kick starter on Harley's FL model was replaced by an electric starter. That's ...

Add Yahoo as a preferred source to see more of our stories on Google. Harley-Davidson introduced the Panhead V-Twin in the fall of 1947 as a replacement for the Knucklehead engine for the upcoming ...

Just about every piston engine is defined by two basic measurements: bore and stroke. Bore is the diameter of the cylinder. Stroke is the distance the piston travels from bottom dead center to top ...

This article is part of our Forever Forward series, which is showcasing the ways Formula 1 is innovating for the 2026 season. Few things split Formula One fans like the power behind the championship’s ...

This file type includes high resolution graphics and schematics when applicable. Automotive engineers are concerned with weight-to-power ratios when designing vehicles. While light-weighting is a ...

Astron aerospace has shown a partial prototype of a new rotary combustion engine it claims runs at an extraordinary 60% thermal efficiency, burning totally clean with zero NOx emissions and nothing ...