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I had a compression test done while I watched. He did it at top DC and bottom . The compression was all 78 or better. He couldn't believe the compression was that good. He also borascoped each cylinder and could not find and problems. He cut the oil filter and found no metal. He told me to carry...

It was a factory rebuild. I am not sure what was used in the rebuild. I was told that they were chrome. I don't know who broke the engine in. The plane is based in WV at PKB. Two mechanics have done compression checks with the lowest being 78/80. One of them is telling me that the front crank...

Today I took a hose from the breather and hooked it up to the airspeed indicator. Much to my surprize both engines were the same. At 1000 rpm 50mph at 1500 it was 75mph and at 2000 it was 95mph. I am told that lycoming has a bulletin that tells you what these readings should be. Does anyone know...

Both the engines were put on in 2001. When I talk to the A&P's they always correct me and have their own idea of what to do.I told them that the oil is coming out the breather, they said no. I asked the one that if the oil ring was broken would I not burn oil or foul plugs, he wants to pull the...

Thank you Bruce and Mike. Is there anything other than bad compression rings that can darken the oil.

I have a 1973 Aztec non turbo. (540)The problem I am having is in the left engine, the oil turns very dark after about 10 hrs. It also blows the oil out over 8 quarts. It was a factory rebuild and has about 1000 hrs. The lowest compression is 74/80. I have had it to two different mechanics and...