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4 Stroke Petrol Engine
Engine displacement
The 4 Stroke engine cycle consist of these: 1) Intake 180degree2) Compression 180
degree3) Power/ Combustion 180
degree4) Exhaust 180
degree
Total engine revolution 720 degree
4 Stroke Cycle
The Intake Stroke consist of the piston
travelling down.
Intake valves are open to allow
Air/Fuel mixture to come into the combustion chamber.
Intake
It is an electrical device that fits into the cylinder head and ignites air fuel
mixtures.
Spark plugs
Inlet valve open
Piston downINTAKE STROKE
Exhaust valve closed
Inlet valve open
Piston downINTAKE STROKE
Fuel in
Exhaust valve closed
Compression stroke consist of the piston travelling back up.
Both intake and exhaust valves are closed
Air fuel mixture is now being compressed
Compression
Inlet valve closed
COMPRESSION STROKEPiston up
Exhaust valve closed
Inlet valve closed
COMPRESSION STROKE
Piston up
Exhaust valve closed
The piston is now at the TDC
Spark plug ignites, creating a spark that ignites the compressed air fuel mixture.
Explosion is created and the piston is forced back down.
Hence the Power stroke
Both valves are still closed
Combustion/Power
Inlet valve closed
POWER STROKE
Exhaust valve closed
Inlet valve closed
POWER STROKEPiston downpowerfully
Exhaust valve closed
Exhaust stroke the piston is travelling
up
Exhaust valve is open
Intake valve is Closed
Exhaust gases being pushed out by piston
Exhaust
Inlet valve closed
EXHAUST STROKE
Exhaust valve open
Piston up
Exhaust gasesout
Inlet valve open
INTAKE STROKE
Exhaust valve closed
Basic Components of Four-Stroke Engines
Intake Valve
Valve Cover
Intake Port
Head
Coolant
Engine Block
Oil Pan
Oil Sump
Crankshaft
Camshaft
Exhaust Valve
Spark Plug
Exhaust Port
Piston
Connecting Rod
Rod Bearings
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