5. 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
6. It is an electrical
device that fits into
the cylinder head and
ignites air fuel
mixtures.
Spark plugs
9. Compression stroke consist of
the piston travelling back up.
Both intake and exhaust valves
are closed
Air fuel mixture is now being
compressed
Compression
12. 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
19. 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