Measuring peak pressure is a simple, quick and cheap  way to maintain engines.

When the combustion engine loses power, measuring compression (peak pressure) is often a first step in locate potential problems. When measuring the cylinders, the pressure on each compression stroke on the peak pressure indicator (gauge) increases until the maximum indicated by the engine manufacturer has been reached, or nearly reached.

If the measured pressure is significantly lower than indicated in the specification of the engine, this may indicate wear. When increasing the max. Cylinder pressure also increase the mechanical stresses.

Depending on how the peak pressure measurement value is, and the engine is set, then measures for repairing the engine can be initiated at short notice.