Types of Engines

There are ...  in all petrol engines.

Diesel engines have ... .

For a four-stroke engine, key parts of the engine include the ..., one or more camshafts and valves.

In both types of engines, there are one or more cylinders and for each cylinder there is a spark plug, ... and a crank.

During ... stroke the inlet valve opens, the piston moves down and a fuel-air mixture is drawn into the cylinder.

The burning of the mixture causes the gases to expand, forcing the piston down in the … stroke.

This engine has two pistons moving in opposite directions in the same cylinder.

Instead of pistons that move up and down in the cylinders, the ... engine has an equilateral triangular orbiting rotor.

The diesel is then ... in the injectors, and a mist is sprayed into the hot air. The hot air immediately ... the fuel.

For a two-stroke engine, there may simply be an exhaust outlet and fuel inlet instead of a valve system. There is no ... in a 2-stroke engine. There is oil in the fuel.