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How a Two Stroke Engine Works

How a Two Stroke Engine Works

A two stroke engine works on much more simple principles than a four stroke


engine. It has a higher power to weight ratio but cannot produce as much torque, for this reason it is mostly seen in small but powerful machines such as lawnmowers, quad bikes, mopeds,leaf blowers, remote controlled aircraft/cars.

Two Stroke Engine Parts

1- 2 stroke engine parts

1- 2 stroke engine parts

Spark Plug – this is used ti ignite the fuel and air mixture. The timing of the spark is controlled by a magnet passing an induction coil on the flywheel, this ensures that the spark plug sparks when the piston is at Top Dead Center (TDC) – at the very top of the cylinder.

Exhaust port, this is where the exhaust gases escape out to the exhaust system

Inlet Port – this is where fuel, two stroke oil and air are sucked into the engine

Flywheel – the flywheel conserves the momentum of the engine when it is not under power, without a flywheel the engine would simply stop at the bottom after the fuel has been ignited

Crankshaft – the crankshaft control the reciprocating (up and down) motion of the piston

Connecting Rod – the connecting rod is the link between the crankshaft and the piston

Transfer port – the transfer port is where the fuel and air are sent from the crankshaft housing up into the cylinder

Piston – the piston is a cylinder of aluminum that fits snugly inside the engine, it is the mean by which the heat explosion created by the burning of the fuel is transferred to motion.

 How a two stroke engine works page 2