Commer TS3: Britain's Insane Six-Piston Truck Engine

The Commer TS3, famously known as the "Knocker", was one of the most eccentric and brilliant diesel engines ever to power British haulage. Designed by the Rootes Group to solve a strict packaging problem, this flat, three-cylinder, six-piston two-stroke machine became the deafening heartbeat of the UK road network in the 1950s and 60s. But despite its incredible torque and fuel economy, the engine—and its aborted 200-horsepower TS4 successor—was ultimately killed by American corporate standardisation, foreign ownership, and changing global regulations. Discover how a masterpiece of British mechanical engineering went from dominating the motorways to surviving only as a supercharged roar at vintage transport rallies. #CommerTS3, #BritishEngineHistory, #RootesGroup.