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  #11  
Old 01-17-2018, 01:04 PM
MK77 MK77 is offline
 
Join Date: Apr 2013
Location: Evanston, IL
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Quote:
Originally Posted by lr172 View Post
+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.
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  #12  
Old 01-17-2018, 02:07 PM
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N941WR N941WR is offline
 
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Quote:
Originally Posted by skylor View Post
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.
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  #13  
Old 01-17-2018, 09:49 PM
deek deek is offline
 
Join Date: Mar 2013
Location: Flathead Lake Montana - 8S1
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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.
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  #14  
Old 01-18-2018, 08:35 AM
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airguy airguy is offline
 
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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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