Important Engine Characteristics

Some basic geometrical relationships and the parameters comonly used to characterize engine operation.

The main factors to an engine user are :

1 . The engine's performance over its operating rage

2 . The engine's fuel consumption within this operating
     range and the cost of the required fuel

3 . The engine's noise and air pollutant emission
     within this operating range

4 . The initial cost of the engine and its installation

5 . The reliability and durability of the engine , its
     maintenance requirements,and how these affect
     engine availability and operation costs

Engine performance is more precisely defined by :

1. The maximum power (The maximum Torque ) available at each speed within the useful engine operating
     range

2 . The range of speed and power over which engine operation is satisfactorty

The following performance definitions are commonly used :

* Maximum rated power : The highest power an engine is allowed to develop for short periods of operation .

* Normal rated power : The highest power an engine is allowed to develop in continuous operation .

* Rated speed : the crankshaft rotational speed at which rated power is developed