Today's Message Index:
----------------------
1. 12:07 PM - Re: EGT, CHT wires and alternator B-lead (Fi Dot)
2. 02:00 PM - Re: EGT, CHT wires and alternator B-lead (Robert L. Nuckolls, III)
3. 02:05 PM - Re: EGT, CHT wires and alternator B-lead (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: EGT, CHT wires and alternator B-lead |
... I know this ain't helping _much_ but when I installed a CGR30P on my
Cheetah, I did not notice the note to _not_ run probes along the
ignition wires, and did so. You can look at the pictures here:
http://79ft.net/entries/misccheetah-cgr-30/. No problems. I asked EI and
they said "boo, but keep it - it worked for years for you after all".
On my current plane with Gem G2; I think the wires were ran along the
B-lead. I'll double check later today. Regardless, I haven't heard of
issues from the gentleman who installed it and flown with it for years.
I will confirm where the wires run later tonight and reply along with a
pic or three.
Fedor 'Fidot' Fomichev.
Chickenhouse Charger
http://79ft.net
------ Original Message ------
From: "rvtach" <rvtach@msn.com>
Sent: 5/7/2019 11:13:10 PM
Subject: AeroElectric-List: EGT, CHT wires and alternator B-lead
>
>Hello all-
>
>I am in the final throes of wiring my RV-7A and one of the last tasks is t
o route the CHT and EGT leads from the engine to the firewall. My question
s is- how much clearance, if any, do I need to provide between these temper
ature wires and the alternator B-lead?
>
>I made a really neat, out of the way, bundle with CHT and EGT wires and th
e B-lead cable (4 AWG welding cable) and then began to wonder what "noise"
i might get in my engine monitor. Way easier and less frustrating to correc
t now if needed than later but I can't find any guidance in the Connection
book or in the Matronics archives.
>
>Thank you to everyone on this list. I really appreciate all the education
I've gotten from this group over the years.
>
>-Jim
>
>--------
>Jim McChesney
>Tucson, AZ
>RV-7A Finishing Kit
>
>
>Read this topic online here:
>
>http://forums.matronics.com/viewtopic.php?p=489127#489127
>
>
Message 2
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| Subject: | Re: EGT, CHT wires and alternator B-lead |
At 11:13 PM 5/7/2019, you wrote:
>
>Hello all-
>
>I am in the final throes of wiring my RV-7A and one of the last
>tasks is to route the CHT and EGT leads from the engine to the
>firewall. My questions is- how much clearance, if any, do I need to
>provide between these temperature wires and the alternator B-lead?
None. This presumes that there are no
installation instructions for your instrumentation
recommending such separation. If instructions DO
call for separation, I would see if you can get
you money back on it and purchase a system
designed to work in aircraft (or any other
vehicle for that matter!).
>I made a really neat, out of the way, bundle with CHT and EGT wires
>and the B-lead cable (4 AWG welding cable) and then began to wonder
>what "noise" i might get in my engine monitor. Way easier and less
>frustrating to correct now if needed than later but I can't find any
>guidance in the Connection book or in the Matronics archives.
>
>Thank you to everyone on this list. I really appreciate all the
>education I've gotten from this group over the years.
I'm pleased that you've benefited from
your participation here . . . spread the
word . . . share your own knowledge and
help promote the List. Nothing suppresses
the value of knowledge more than a failure
to skillfully exploit it.
Bob . . .
Message 3
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| Subject: | Re: EGT, CHT wires and alternator B-lead |
At 02:06 PM 5/8/2019, you wrote:
>... I know this ain't helping _much_ but when I
>installed a CGR30P on my Cheetah, I did not
>notice the note to _not_ run probes along the
>ignition wires, and did so. You can look at the
>pictures here:
>http://79ft.net/entries/misccheetah-cgr-30/. No
>problems. I asked EI and they said "boo, but
>keep it - it worked for years for you after all".=C2
>
>On my current plane with Gem G2; I think the
>wires were ran along the B-lead. I'll double
>check later today. Regardless, I haven't heard
>of issues from the gentleman who installed it
>and flown with it for years. I will confirm
>where the wires run later tonight and reply along with a pic or three.=C2
Actually a big help. The dreaded stresses
conducted along such wires are really easy
to accommodate in the design of engine
instrumentation . . . because if they
couple from one wire to another, the
coupling is weak. Further the electro-
magnetic spectrum of such noises are
far outside the signals of interest
coming in from engine sensors. Standing
them off with a bit of simple filtering
is a trivial task.
Your experience shared supports this
notion.
Bob . . .
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