What is Specific Power Output of Engine?

The power output of an engine per unit piston area is known as its specific power output, and it is a measurement of the engine designer’s ability to use the available piston area independent of cylinder size.

Mean effective pressure multiplied by mean piston speed yields specific power. 

Specific power output, Ps = bp / A

= constant x pbm x sp 

As can be seen, the specific power output is made up of two components: the force available to operate and the speed at which it works.

Hence, with the same piston displacement and brake mean effective pressure bmep, a faster engine will produce a greater specific output.

It is obvious that increasing the speed or bmep of an engine can enhance its output.

The mechanical load on various engine components increases as speed increases. Raising bmep necessitates better heat dissipation from the fuel, as well as a greater thermal load on the engine cylinders.