If the manufacturer's timing specification is 8 degrees BTDC but the actual timing is 4 degrees BTDC, what is the result of the timing test?

When conducting a timing test, it is important to compare the manufacturer's specification with the actual timing of the engine. The specification in this scenario indicates that the timing should be set at 8 degrees Before Top Dead Center (BTDC). However, if the actual timing is measured at 4 degrees BTDC, this presents a significant deviation from the manufacturer's requirement.

The result of the timing test is classified as a failure in this situation because the engine's timing is not set within the acceptable parameters prescribed by the manufacturer. Timing that is too retarded (as indicated by 4 degrees BTDC instead of the required 8 degrees BTDC) can lead to various performance issues, such as reduced power output, increased emissions, and potential engine knocking. Consequently, proper timing is crucial for optimal engine performance and compliance with emissions standards, which is why this timing discrepancy is considered a failure rather than normal operation or any possibility of adjustment at this stage.