2 Stroke Diesel Engine
We will begin learning how the 2 stroke diesel engine works with the engine in the following position –
The fuel/air mixture has just been ignited and the expansion of the gases will force the piston downwards.
The next image shows the engine at the bottom of its stroke, this is the lowest point the piston will reach –
The 2 stroke diesel engine has an inlet port (hole) in the cylinder wall that is opened and closed depending on the position of the piston. The inlet port allows air into the cylinder when the piston uncovers it. This air is constantly being forced in by an air pump that is connected to the engine by a belt, so as soon as the piston uncovers the port a strong rush of air enters the cylinder –
When the air inlet port is uncovered the engine has also been timed to have the exhaust valve open, this ensures that the incoming air fills the cylinder AND expels the exhaust gases out of the open exhaust valve –