There are several factors to consider in the selection of an engine.

Type of Fuel
The type of fuel chosen will depend to a large degree on availability, price, local building codes, and pollution restrictions. For instance, in some communities, natural gas is not available for industrial use, while in others, local building codes will prohibit storage of diesel fuel.

The price of one fuel may preclude its use in comparison with another type of fuel. Moreover, emissions restrictions may have a bearing on what type of fuel may be used. All of these are factors in choosing an engine.

Horsepower Load and Speed
The load and speed of the equipment to which the engine will be coupled are key considerations in engine selection. The aim is to match the prime mover to the power required at a speed which will be compatible with the equipment to be driven, while maintaining optimum efficiency.

Duty Cycle
The duty cycle should be examined to determine whether continuous or intermittent operation of the equipment is required, because this affects engine selection.

Brake Mean Effective Pressure (BMEP) This is important because the higher the figure, the greater the chance for higher stress on working parts of the engine. This could mean higher maintenance costs and earlier need for rebuilding.

Fuel and Oil Consumption
With the cost of petroleum or fossil-based fuels tending to rise over time, this is becoming an increasingly significant factor in the selection of an engine.

Torsional Compatibility
A torsional analysis should be conducted to determine whether the engine and driven equipment are compatible with respect to operating stress in the shaft system.

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