When we did the pre buy on the six I purchased we found 1 cylinder down on compression leaking out the exhaust valve. Flew it a bit and it came back up to normal. At the first annual this year it was down again so we decided to address it. The normal tricks did not work to bring the compression up to where we wanted it. Pulled the cylinder and sent it to Penn Yan where they found the valve seat appeared to have been miss cut probably caused by the cutter chattering a bit. Depending on how the value had rotated explained the up and down compression. Valve seat has been re cut with no other problems noted and cylinder should be back on this Wednesday.
There is lots of info on break in procedures available but very little talks about what to do when one cylinder only is removed. Penn Yann did hone the cylinder. They are ECI Nickel Carbide cylinders that I am told break in very easy. ECI recommends Phillips 20-50 XC oil for break in and normal ops. Any thoughts other then run it hard the first 10 hours? Altitude or airspeed suggestions? The aircraft does have 10 to 1 compression pistons with FI and full engine monitoring.
George
There is lots of info on break in procedures available but very little talks about what to do when one cylinder only is removed. Penn Yann did hone the cylinder. They are ECI Nickel Carbide cylinders that I am told break in very easy. ECI recommends Phillips 20-50 XC oil for break in and normal ops. Any thoughts other then run it hard the first 10 hours? Altitude or airspeed suggestions? The aircraft does have 10 to 1 compression pistons with FI and full engine monitoring.
George
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