S.No
|
Petrol Engine
|
Diesel Engine
|
1.
|
Air petrol mixture is
sucked in the engine cylinder during suction stroke.
|
Only air is sucked during
suction stroke.
|
2.
|
Spark Plug is used.
|
Employs an injector.
|
3.
|
Power is produced by spark
ignition.
|
Power is produced by
comparison ignition.
|
4.
|
Thermal efficiency up to
25%.
|
Thermal efficiency up to
40%.
|
5.
|
Occupies less space.
|
Occupies more space.
|
6.
|
More running cost.
|
Less running cost.
|
7.
|
Light in weight.
|
Heavy in weight.
|
8.
|
Petrol being volatile is
dangerous.
|
Diesel is non-dangerous as
it is non-volatile.
|
9.
|
Pre-ignition possible.
|
Pre-ignition not possible.
|
10.
|
Works on Otto cycle.
|
Works on Diesel cycle.
|
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Difference between petrol and Diesel engine
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