What every aircraft owner should know about cylinder compression testing

What is the purpose of a compression test, and what does it really tell us? As you watch this webinar,
\ it will probably conflict with a lot of what you have been taught, told, or read over the years.

[@johnenglish3255]

Great post! A little long but great stuff to know as a pilot, A&P or aircraft owner. The only post I’ve seen on You Tube that discusses how the calibrated leak works with the differential compression testers and aircraft reciprocating engines. Thanks for posting.

[@cessnaflyerassociation1493]

Glad you enjoyed it!

[@John-nc4bl]

Thanks for your video.
On the cylinder being leak checked, the piston rings should be seated in the bottom surfaces of their lands, (ring grooves in the piston).
To achieve this the piston must be coming up on its upstroke.
If the rings are not seated in the bottom of their lands, the compressed air can escape thru the ring gaps, then under the rings and give a little lower gage reading.

[@josephkaminski1857]

There is a major flaw in this test.