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Possible reasons for low compression...

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pasj66

Joined: 28 Jan 2009
Posts: 7
Location: Gothenburg, Sweden (ESGI)

Posted: Thu May 13, 2010 12:00 pm Post subject: Possible reasons for low compression...

Hello all,

I am hoping to get some input on a problem I noticed on the first 200 h service on my 914 UL3. When the engine was new the compression was 87/86 on all cylinders. Now it was 87/58 on cyl 1, 87/66 on cyl 2, 87/81 on cyl 3 and 4. A couple of months ago I did the SI regarding oil leakage from the cylinder barrels so a MIF (maintenance induced error) is not ruled out. Do anyone have experience with misaligned piston ring gaps? what is the remedy? new piston rings? I have 4 EGTs and the front cylinders usually runs richer but the plugs are clean after running on cruise power. Mag drops 240/270.



Happy for your input.



Best regards

Patrik

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