Today's Message Index:
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1. 12:36 AM - Re: EGT ()
2. 08:15 AM - Re: EGT (Brian Lloyd)
3. 11:48 AM - Christmas Mags?? (Cpayne)
Message 1
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I would disagree with useless. You cant use a laser temp gauge in the air.
I had a "slight" engine roughness in the air, but not on the ground. It
would only happen at altitudes greater than 4k. Turned out to be the wires
to two cylinders going bad. But I knew which ones, due to the EGT.
I've had bad plug issues in the past, prior to the EGT that took a number of
attempts to fix from good mechanics (not me). Each recommended the EGT
probes as the fastest way to know which cyl was giving us the problems.
YMMV
Bear
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Genzlinger, Reade
Sent: Thursday, December 08, 2011 10:55 PM
Subject: RE: Yak-List: EGT
A rough running engine will tell you all that too! A simple check with a
laser pyrometer ($80) will tell you which cylinder is cold on mag and plug
issues. Primer and intake is easily identified by rough idle and visual
cockpit check. If you don't have a way to lean the 9 probe egt is pretty
useless.
Reade Genzlinger
Cairnwood Cooperative Corp.
215.914.0370
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of dabear@devere.us
Sent: Thursday, December 08, 2011 10:40 PM
Subject: RE: Yak-List: EGT
So, yes, having the EGT readings can help if you have a bad plug or wire.
It can also tell you when you left the primer cocked over/open and it can
tell you when you left the intake drain open. It immediately tells you when
you have a Cyl problem. I think it is worth the installation as it saves
time/cost in troubleshooting problems.
Bear
Message 2
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On Sat, Dec 10, 2011 at 12:33 AM, <dabear@devere.us> wrote:
> I would disagree with useless.
>
A single-point EGT is useless. The only exception to that is a TIT but then
you are measuring something else.
You cant use a laser temp gauge in the air=85 I had a =93slight=94 engine
> roughness in the air, but not on the ground. It would only happen at
> altitudes greater than 4k. Turned out to be the wires to two cylinders
> going bad. But I knew which ones, due to the EGT. ****
>
> I=92ve had bad plug issues in the past, prior to the EGT that took a numb
er
> of attempts to fix from good mechanics (not me). Each recommended the EG
T
> probes as the fastest way to know which cyl was giving us the problems.
>
Yes, a probe-per-cylinder EGT is useful. But without a mixture control, it
is substantially less useful. Sure it helped you in that case but you have
to weigh the cost of troubleshooting the plug wires without EGT with the
cost of the EGT. Of course your mechanic recommended it. There was no
incremental cost to him.
And then there is the point of knowing that your plug wires are more than 5
years old and should be replaced anyway. Plug wires and hoses. You know,
one of the best ways to ensure that your airplane doesn't have problems
while flying is to be aggressive on prophylactic maintenance. That
substantially mitigates the need for diagnostic instrumentation.
--
Brian Lloyd, WB6RQN/J79BPL
3191 Western Dr.
Cameron Park, CA 95682
brian@lloyd.com
+1.767.617.1365 (Dominica)
+1.916.877.5067 (USA)
Message 3
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| Subject: | Christmas Mags?? |
Yes, you too could put a pair of Mags under the tree for your "baby". Just finished
going through a pair of M9F (M-14P) mags that I had taken off some time ago.
They ran good after some maintenance. I'll probably do an article using pics
I took while going through them since I went beyond what the Task cards spell
out.
658TT, 462 factory SMOH and 0 since maintenance. Rotors included but no distributor
caps or couplers since I'm still using them. Best reasonable offer takes
'em.
Craig Payne
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