DOHC
Twin camshaft setup
DOHC stands for dual overhead camshaft, an engine configuration where two camshafts sit above the cylinders—one operating intake valves, the other exhaust valves.
This design allows precise valve timing at high RPMs, making it standard in performance and modern passenger vehicles: a 2.0-liter DOHC four-cylinder.
Compare SOHC (single overhead camshaft).
Lobed rod operating valves
- valvetrainEngine valve operating system
- cylinderCircular-based solid form
- overheadLocated directly above
- timingArt of choosing moments
belt · chain · valves · intake · exhaust · crankshaft · rocker arm · lifter
Rate of mechanical work
- torqueRotational force measurement
- revolutionsTurnovers of power
- redlineEditorial revision marking
- throttle responseEngine's reaction to pedal
acceleration · power band · naturally aspirated · turbocharger · supercharger · tuning · sportscar · racing
Accuracy of measurement
- toleranceWillingness to accept difference
- synchronizationAligning timing across systems
- calibrationAdjusting for measurement accuracy
- four-strokeEngine completing cycle in four stages
combustion · aspiration · direct injection · optimization · thermodynamics · bore · stroke · compression ratio
camshaft
Lobed rod operating valves
- valvetrainEngine valve operating system
- cylinderCircular-based solid form
- overheadLocated directly above
timing · belt · chain · valves · intake · exhaust · crankshaft · rocker arm · lifter · twin-cam
horsepower
Rate of mechanical work
- torqueRotational force measurement
- revolutionsTurnovers of power
- redlineEditorial revision marking
throttle response · acceleration · power band · naturally aspirated · turbocharger · supercharger · tuning · sportscar · racing · Formula One
precision
Accuracy of measurement
- toleranceWillingness to accept difference
- synchronizationAligning timing across systems
- calibrationAdjusting for measurement accuracy
four-stroke · combustion · aspiration · direct injection · optimization · thermodynamics · bore · stroke · compression ratio · engine design
- Transport AbbreviationsMPG, RPM, VIN, DMV, ETA
- enginesdiesel engine, gasoline engine, car engine, truck engine, piston engine
- valvetraincamshaft, camshafts, valve, rocker arm, rocker arms