"What is the difference between a Petrol and Diesel Engine?
Petrol engine:
- In petrol engines fuel is mixed with air
- then forced into the cylinders
- where the fuel-air mix is compressed by the pistons
- and ignited by spark plugs.
Diesel engine:
- In a diesel engine the air is compressed before the fuel is added to it.
- When air is compressed it heats up. This means that when the fuel is added to the compressed air it is very hot and the fuel-air mix ignites automatically. (So there are no spark plugs in a diesel engine as pressure is used to ignite the fuel-air mix.")
source
Brilliant animated demonstration of the working of a diesel engine on Thomas Schwenke online channel
Brilliant animated demonstration of the working of a diesel engine on Thomas Schwenke online channel
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