Internal Combustion Engines
Diesel engine can work on very lean air fuel ratio of the order of 30: 1. A petrol engine can also work on such a lean ratio provided

It is properly designed
Flywheel size is proper
Cannot work as it is impossible
Best quality fuel is used

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Internal Combustion Engines
The compensating jet in a carburettor supplies almost constant amount of petrol at all speeds because the

The diameter of the jet is constant and the discharge coefficient is invariant
Flow is produced due to the static head in the float chamber
Jet area is automatically varied depending on the suction
The flow from the main jet is diverted to the compensating jet with increase in speed

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