Engine Compression

How to Do An Engine Compression Test by Staff Writer A brief comparison of dry compression, wet compression, and leak-down tests. Read Article at Autozone Dynamic Duo by Mark Warren How to use a current clamp and oscilloscope combination to check cranking compression and the starter motor. Read Article at Motor Magazine Lab Scopes and […]

Almost every compression testing guide tells you to hold the engine’s throttle wide open during a compression test, but most won’t tell you why it may (or may not) matter.