Firewall Forward: Compression Testing


Unlock the mysteries of the aircraft-engine leakdown test, otherwise known as the differential compression test. KITPLANES engine meister Paul Dye breaks down the process of compression testing and explains what the readings mean.

This series is sponsored by Tempest Aero Group.

View the complete list of published Firewall Forward videos.


  1. 2 things- 1 Lycoming SI recommends doing with a warm engine. I have found on Continentals this is critical.
    2 On a Rotax you use a different tester with a smaller orifice due to engine tolerances being much tighter


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