overhead cam
Top-mounted camshaft
An overhead cam is a camshaft positioned above the engine's cylinders rather than within the engine block.
This design, standard in modern automotive engines, allows more direct operation of the valves and typically enables higher engine speeds.
A dual overhead cam (DOHC) engine has separate camshafts for intake and exhaust valves.
Lobed rod operating valves
- valvetrainEngine valve operating system
- DOHCDual overhead camshaft
- timing beltEngine valve regulator
- timing chainEngine valve synchronization belt alternative
rocker arms · lobes · sprockets · tappets
Machine producing motion
- four-cylinderEngine with four pistons
- inline-sixSix-cylinder engine configuration
- V8Eight-cylinder engine layout
- combustionExothermic reaction with oxygen
piston · crankshaft · spark plug · fuel injection · intake manifold · exhaust manifold · turbocharger · displacement
Rate of mechanical work
- torqueRotational force measurement
- throttle responseEngine's reaction to pedal
- power bandElastic fitness loop
- RPMTurns in sixty seconds
Flow-controlling mechanisms
- pushrodsRods activating overhead valves
- journalRecord of daily events
- lubricationCoating to reduce friction
- oil pressureLubricant circulation force
camshaft
Lobed rod operating valves
- valvetrainEngine valve operating system
- DOHCDual overhead camshaft
- timing beltEngine valve regulator
timing chain · rocker arms · lobes · sprockets · tappets
engine
Machine producing motion
- four-cylinderEngine with four pistons
- inline-sixSix-cylinder engine configuration
- V8Eight-cylinder engine layout
combustion · piston · crankshaft · spark plug · fuel injection · intake manifold · exhaust manifold · turbocharger · displacement · four-stroke
horsepower
Rate of mechanical work
- torqueRotational force measurement
- throttle responseEngine's reaction to pedal
- power bandElastic fitness loop
RPM · redline · breathing · dyno · naturally aspirated
valves
Flow-controlling mechanisms
- pushrodsRods activating overhead valves
- journalRecord of daily events
- lubricationCoating to reduce friction
oil pressure · non-interference · retainers · keepers · guide rails