Tom3holer
MEMBER
Cape Cod
We just started the annual on my 185 and the compression had dropped a good deal from last year.
Last year they were 73,75,69,70,71,72. This check showed 63,73,60,64,63,62. The engine has 233 hrs. since a 2006 FRM.
I dd one flight around the patch to warm it up. The plane had flown about 70 hours since last annual and had been running Phillips 20/50 with a bottle of Camguard. Previously it had run Aeroshell.
Most of the flights were over an hour. I have been running LOP on most all the flights and operating per Gami recommended procedures. My mechanic was in a bit time constraint to leave for an appointment so we didn't have time to do any diagnosing with the scope till he returns on Monday.
In going through the logbook the previous compressions were fairly consistent over the years. I do have a multiprobe engine analyzer and keep an eye on temps and the cylinder temps run in the low 300's with #1 the highest at 360 in cruise. the EGT's all in the mid to upper 1400's.
I am questioning the change from AS to Phillips and perhaps the LOP operation but am quite concerned at the big drop almost on all jugs.
Any thoughts or suggestiosn greatly appreciated.
Tom
Last year they were 73,75,69,70,71,72. This check showed 63,73,60,64,63,62. The engine has 233 hrs. since a 2006 FRM.
I dd one flight around the patch to warm it up. The plane had flown about 70 hours since last annual and had been running Phillips 20/50 with a bottle of Camguard. Previously it had run Aeroshell.
Most of the flights were over an hour. I have been running LOP on most all the flights and operating per Gami recommended procedures. My mechanic was in a bit time constraint to leave for an appointment so we didn't have time to do any diagnosing with the scope till he returns on Monday.
In going through the logbook the previous compressions were fairly consistent over the years. I do have a multiprobe engine analyzer and keep an eye on temps and the cylinder temps run in the low 300's with #1 the highest at 360 in cruise. the EGT's all in the mid to upper 1400's.
I am questioning the change from AS to Phillips and perhaps the LOP operation but am quite concerned at the big drop almost on all jugs.
Any thoughts or suggestiosn greatly appreciated.
Tom