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1. 09:41 PM - Re: RV-10 Down (rv10flyer)
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Very sad to hear this.
I missed his second from last post on VAF...and no replies. 1500F EGT's!!
"I have begun to see lower CHT and EGT on cyls 1 and 3 lately at idle, with EGT
not even registering on my MGL Odyssey display until runup. At runup RPM, all
temps seem pretty even on all cyls. CHTs are about 50F less than the neighbors
but are reasonable. At max power on takeoff the EGTs are slightly higher +50F
than the other cyls - just over 1500. At cruise WOT all CHT/EGT readings are
very similar on all cylinders. Reducing power sends the EGTs higher on 1 and
3 than the others. Mag drops seem fine and similar on both.
When I changed the oil I noticed that I have some dark oily varnish to the left
of the plugs and dripped down the intake pipes near the intakes on 1, 2, and
3 cylinders. I suspect that maybe there was some oil was finding its way out around
the intake gaskets. I was also thinking that an air leak here (too much
induction) at low RPM could make it too lean to fire and explain low rpm pops
on the right side of the engine which I sometimes hear, and might explain lower
CHT at idle.
So, I am going to change the gaskets on the intakes and also the EGT probes - two
of which have been replaced in the past three years for bizarre readings. This
may be more of the same related behavior, but I want to be sure.
Anyone else seen such behavior with their Lyc 540s or its sensors? Other suggestions
or thoughts would be appreciated.
__________________
Doug Nebert - RV-10, #40546 (SB), started 2/2006, low compression O540 with older
CS prop, 375+ hours on Hobbs. Flying since August 2010. Based KONP, Newport,
OR"
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Wayne G.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=424478#424478
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