Internal Combustion Engines
The output of a diesel engine can be increased without increasing the engine revolution or size in following way

Feeding more fuel
Scavenging
Heating incoming air
Supercharging

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Internal Combustion Engines
The injector nozzle of a compression ignition engine is required to inject fuel at a sufficiently high pressure in order to

Inject fuel in a chamber of high pressure at the end of compression stroke
Inject fuel at a high velocity to facilitate atomization
All of these
Ensure that penetration is not high

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