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Old 01-17-2018, 01:04 PM
MK77 MK77 is offline
Join Date: Apr 2013
Location: Evanston, IL
Posts: 106

Originally Posted by lr172 View Post
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.

Yes, both #1 and #2 cylinders are fired from the same coil pack so it certainly is pointing in that direction.
Matt K.
RV-7 Tip-up - Flying!
XP Superior IO-360 w/cold air sump, Catto 3 blade prop
Garmin G3X
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Old 01-17-2018, 02:07 PM
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N941WR N941WR is offline
Join Date: Jan 2005
Location: SC
Posts: 11,600

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.


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.
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
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Old 01-17-2018, 09:49 PM
deek deek is offline
Join Date: Mar 2013
Location: Flathead Lake Montana - 8S1
Posts: 308

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.
'83 LongEZ - N888EZ 3,314 hours
'89 LimoEZ - N26EZ 686 hours (sold)
A couple of Glasairs and a Lancair 320...
Next: a RV14 need something to build
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Old 01-18-2018, 08:35 AM
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airguy airguy is offline
Join Date: Oct 2006
Location: Garden City, Tx
Posts: 4,321

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.
Greg Niehues - VAF 2018 dues paid
Garden City, TX
N16GN flying!
Built an off-plan 9A with too much fuel and too much HP. Should drop dead any minute now.
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