OHV, OHC, SOHC and DOHC (twin cam) engine - Automotive illustrated glossary
DOHC means Double OverHead Cam, or sometimes it could be called "Twin Cam" or "Double Cam." Most modern cars have DOHC engines. A typical DOHC engine has two camshafts and 4 valves per cylinder. One camshaft operates intake valves that are ......