valve timing
Intake-exhaust coordination mechanism
Valve timing refers to when an engine's intake and exhaust valves open and close relative to piston position.
Precise timing determines how efficiently air and fuel enter the cylinder and how completely exhaust gases exit.
Variable valve timing systems adjust this dynamically for better performance or fuel economy.
Mechanics check valve timing when diagnosing engine problems: The timing was off by several degrees.
- camshaftLobed rod operating valves
- overhead camCamshaft positioned above valves
- pushrodEngine valve linkage component
- crankshaftRotating engine shaft
- pistonReciprocating cylinder component
retard · engine · cylinder · engine block · rocker arm · overlap · tappet · advance · duration · exhaust · compression ratio · engine tuning · throttle response · horsepower · intake manifold · combustion chamber · four stroke · intake
- Engine Managementfuel injection, ignition system, throttle, fuel injector, spark plugs
- valve partsrocker arm, pushrod
- mechanicsforce, turning, rotation, momentum, velocity
- engine behavioridling, running, stalling, starting, revving