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EGT, CHT wires and alternator B-lead

 
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rvtach



Joined: 28 Jan 2008
Posts: 26
Location: Tucson, AZ

PostPosted: Tue May 07, 2019 8:13 pm    Post subject: EGT, CHT wires and alternator B-lead Reply with quote

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?

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.

-Jim


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Jim McChesney
Tucson, AZ
RV-7A Flying
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web(at)79ft.net
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PostPosted: Wed May 08, 2019 11:07 am    Post subject: EGT, CHT wires and alternator B-lead Reply with quote

... 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

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nuckolls.bob(at)aeroelect
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PostPosted: Wed May 08, 2019 1:00 pm    Post subject: EGT, CHT wires and alternator B-lead Reply with quote

At 11:13 PM 5/7/2019, you wrote:
Quote:
--> AeroElectric-List message posted by: "rvtach" <rvtach(at)msn.com>

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!).


Quote:
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 . . .


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PostPosted: Wed May 08, 2019 1:05 pm    Post subject: EGT, CHT wires and alternator B-lead Reply with quote

At 02:06 PM 5/8/2019, you wrote:
Quote:
... 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".Â

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.Â
Quote:

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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