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-   -   4th flight engine issue (https://vansairforce.net/community/showthread.php?t=156945)

MK77 01-17-2018 12:04 PM

Quote:

Originally Posted by lr172 (Post 1232915)
+1
Losing one of two plugs in a cylinder will cause the "effective timing" to retard for that cylinder. This causes an increased EGT and decreased CHT. I also would be looking at the coil pack if it is shared by the two problem cylinders.

Larry

Yes, both #1 and #2 cylinders are fired from the same coil pack so it certainly is pointing in that direction.

N941WR 01-17-2018 01:07 PM

Quote:

Originally Posted by skylor (Post 1232903)
Usually when one of the 2 plugs on a cylinder stops firing the EGT rises due to the slower mixture burn, and the CHT will drop.

Skylor

RV-8

Yes, I wasn't sure if he was talking CHT or EGT's and I had thought, maybe, just maybe he had tried running it one just one ignition. That will tell you pretty quickly where the problem lies.

deek 01-17-2018 08:49 PM

I have about 6,600+ hours with LSE equipped planes. 1 coil intermittent coil failure above FL200, one bad coil spade connector/spade interface, and one intermittent RG58 (prior to Klaus being urged to supply RG400) failure due to long term thermal degradation with migration of center conductor towards the ground foil/braid.

I'd check the RG 400 lead and the male/female spades *very* carefully with a DVOM, actively wiggling the lead.

airguy 01-18-2018 07:35 AM

I've only got a couple hundred hours with LSE but I've had one user-caused installation error related to the coax, and one bad spade connector on a coil causing the coil to drop out. No problems with the coils themselves, as long as the connections to it were good.


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