Low Compression on 2 Cylinders

[KenyaSkies]

Thanks David.

[KenyaSkies]

To All - I had a second compression test and the numbers are not good. 52; 32; 0. I have delivered the plane to the maintainance shop in Nairobi and they are going to pull the cylinders and take a look. It's looking like I may go with a full set of new cylinders as there are 900 hrs remaining on the engine. He will take a look first and let me know what he finds so I will send an update when I have that. In the meantime here's the question for today: where is the place in the US (or UK if possible) to purchase new cylinders? I communicated with Continental a while back and they quoted $900. Any advice appreciated. They would be shipped to the UK then to Kenya. Thanks - Nick

[GAHorn]

I've done business for many years with these people and I've always been very happy with their service and knowledge.

J J Airparts in Pleasanton, Texas.

http://www.jjairparts.com/

[FredM]

Turning the prop opens the exhaust valve so of course you are going to have air escape with the valve open. A compression ck is done with the cylinder at top dead center of the compression stroke not while turning the prop, that is because both valves are closed at Top dead center. If it leaks when the valve is supposed to be closed, then you have a problem either with the valve, valve guide or seat. If there isn't a leak into the exhaust your problem is elsewhere. piston rings (air leak into the crankcase or intake valve (leak into the intake)