Today I want to show you a unique engine. It’s called the INNengine, and it claims to be a 1-stroke engine. No crankshaft, no cylinder head, 120hp naturally aspirated from just 500cc, and only 35kg.

With a slogan like “The Future is Ecclectic,” we’d expect some interesting things from INNengine, a startup based in Spain. The company is showcasing a “one-stroke” engine that works as an opposed ...

Gearheads and faithful Jalopnik readers already know the basics of an engine's bore and stroke, but for those that might be new here, let's dip our toes in the shallow end. An engine's bore refers to ...