4 stroke engine – induction compression combustion exhaust
induction – intake valve open atmospheric pressure draws in air and fuel mixture when piston is traveling to BDC. Exhaust valve is closed.
Compression – both valves are closed piston is traveling to TDC and compresses the air and fuel mixture
Combustion – Both valves are closed. Air fuel mixture is ignited by spark plugs when piston is near TDC piston then heads to BDC from explosion
The four stroke engine was invented by Nicolaus Otto in the year 1976. The four stroke engine was theorised in 1961 by Alphonse Beau de Rochas but Nicolaus Otto was the first to make it practical
Crankshaft - Converts the up and down movement for the pistons to a rotational movement of the crankshaft.
Camshaft - Connected directly to the crankshaft by timing belt. Controls the inlet and oulet valves and the air/fuel mixture
Valve collets - Work in pairs to hold the inlet and exhaust valves in the engine
Valve stem seals - Control the amount of oil to the valves and to the combustion chamber for lubrication. sit on top of the valve stem
Head gasket - Sits inbetween the engine block and the cylinder head to create maximum compression and prevent leaks from coolant and oil into the cylinders
Pistons - Attached to the crankshaft by con rods. creates compression of the air fuel mixture which ignites and the force created turns the crankshaft
Piston rings - Open ended rings around the piston to seal the combustion chamber, transfer heat from the piston to the cylinder wall, and control oil consumption
Cambelt - The cambelt is connected to the crankshaft and the camshaft and it controls the timing of the engines valves
Flywheel - Connected to the crankshaft and provides the momentum to keep the crankshaft turning from the energy created by the combustion stroke
Bore - The diameter of the combustion chamber
Stroke - The movement of the piston from Top Dead Center to Bottom Dead center
good effort
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