Question

The pressure at the end of compression in the case of the diesel engine is of the order of
(A) $6Kg/cm$
(B) $12Kg/cm$
(C) $20Kg/cm$
(D) $35Kg/cm$

Answer 1

Hint: Compression pressure is defined as the pressure which is produced at the end of the compression stroke without fuel combustion in a reciprocating piston engine. Compression indicates a density rise or a volume change, whereas friction is a force applied to the surface.

Complete step by step answer: There are no spark plugs for diesel engines to ignite the fuel. The friction is so great that the temperature is very high in the cylinder. The pressure is so high (16:1 or 234 psi), that without a spark plug, the temperature becomes high enough to ignite the fuel. The pressure at the end of the compression is $35Kg/cm$ in the case of diesel engines.
Hence, option (D) is the correct option.
Additional information:
Compression failure is the result of a leak caused by normal engine wear and tear in one or more of the cylinders. It can cause misfiring and low vehicle efficiency if you experience compression failure in one cylinder of the engine. A drop in power output is an indication of internal parts that are worn-out.

Note: In this question you are asked to find the order of pressure at the end of compression in the case of diesel engines. In this solution, we go through the basic details of compression pressure and diesel engine. We also study the cause of loss of compression in diesel engines and most importantly we find out the pressure at the end of compression in the case of diesel engines.