Lapping Rubric

May 23, 2024 | Uncategorized

Is your valve a candidate for lapping? If the valve shows asymmetrical heating – maybe because the rotator has failed – but there are no green spots…

Or if the valve shows symmetrical heating but compression numbers indicate poor contact between the valve and the seat…

Then lapping might be a good next step.

In this video, Mike Busch demonstrates how to lap a valve without removing the cylinder or dropping the exhaust riser.