Both procedures are diagnostic tools employed to evaluate the condition of an internal combustion engine’s cylinders. One assessment measures cylinder sealing capability by injecting compressed air and monitoring the rate of pressure loss. This provides insight into where potential leakage is occurring, such as through the valves, piston rings, or head gasket. The other assessment quantifies the maximum pressure achieved within a cylinder during the compression stroke, indicating the overall ability of the cylinder to compress the air-fuel mixture. For example, a low reading in this assessment could suggest worn piston rings or leaking valves.
Effective engine diagnostics are crucial for maintaining optimal engine performance and preventing costly repairs. Accurate assessment of cylinder condition enables informed decisions regarding necessary maintenance or repairs, extending engine lifespan and improving fuel efficiency. These types of testing methods have evolved over time, becoming increasingly sophisticated with the advent of digital gauges and diagnostic software, enhancing the accuracy and efficiency of engine evaluation.