The diesel engine efficiently converts chemical energy into mechanical energy more so than a regular gasoline engine. This is because the compression concentrates the air in the cylinder. Diesel fuel reacts more with the oxygen because of the concentration. The concentration means improved efficiency. Explosions in the cylinders happen after the air is injected and then fuel is ignited because of the heated compressed air.
The diesel engine has a four stroke combustion cycle:
- Intake stroke: Intake valve opens, letting air in and moving the piston down
- Compression stroke: The piston come back up and compresses the air
- Combustion stroke: While the piston reaches the top fuel is injected and ignited making the piston go down.
- Exhaust stroke: The piston moves up pushing the exhaust out of the exhaust valve.
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