This is a great way to tell if you have dusted an engine or you have an issue with one cylinder. This is far better then a compression test as it can help tell you what the issue is. It applies to most four-stroke cars and trucks, testing the engine cylinder sealing is within the allowed range of leak or engine cylinder leaks, quickly find the source problem, also can further analyse and judge the leakage position and the reason from the failure issue, in order to take measures to eliminate failures, help you save time and cost of maintenance. Some of the tests results could be Creaked head or block, piston ring blow by, exhaust valve leak or inlet valve leak and so on. this is something we do after almost every race to make sure everything is good to go.