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Bob Barrow
Joined: 11 Jan 2006
Posts: 29
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 Posted: Sun Aug 30, 2009 6:11 pm Post subject: Sensor wires with ignition leads |
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I've seen quite a few Experimental aircraft (and some certificated aircraft) with the EGT and CHT sensor wires bundled with the lower ignition leads on Lycoming engines.
The usual protocol is to attach the lower ignition leads to the cylinder heads by means of a clamp attached at the lower rocker cover screw. The EGT and CHT sensor wires are then run through the same clamp.
Is this a kosher practice. It's certainly convenient....but are there any downsides to bundling these sensor wires with ignition leads.
Regards Bob Barrow
Click Here View photos of singles in your area [quote][b]
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nuckollsr
Joined: 24 Mar 2009
Posts: 95
Location: Medicine Lodge, KS
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| Posted: Mon Aug 31, 2009 4:10 am Post subject: Re: Sensor wires with ignition leads |
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Bundling the wires of different and potentially antagonistic systems is quite practical and in fact a foregone conclusion in the TC aircraft world. There's a suite of tests conducted for all electro-whizzies that quantifies potential victimization/antagonism factors when installed per the manufacturer's instructions.
While building wire bundles for biz jets consisting of a hundred miles of wire and very limited options for wire routing, the LAST challenge anyone wants to address is a requirement for keeping the wires of one system separated from the wires of another system.
The general rule is that unless the manufacturer demands that such separations be established, don't worry about it. It they DO make such demands, you may wish to consider an alternative system. Separation requirements arise from lack of due diligence in crafting an installer and user friendly system. Lack of diligence in issues of environmental co-existence aboard airplanes should make one wonder if other qualities you seek are likewise lacking.
Bob . . .
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Bob Barrow
Joined: 11 Jan 2006
Posts: 29
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| Posted: Tue Sep 01, 2009 4:20 pm Post subject: Sensor wires with ignition leads |
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Bob C I'm building an RV7A (not much guidance from the "manufacturer" on this issue). Am I to conclude from your comments below that I might be better off separating the EGT and CHT sensor wires from the ignition leads.
If the sensor wires are run with the ignition leads what possible adversities might I be facing. Might I get radio noise. Might I get erroneous instrument readings from the EGT and CHT guages.
Regards Bob Barrow
| Quote: | Subject: Re: Sensor wires with ignition leads
From: bob.nuckolls(at)aeroelectric.com
Date: Mon C 31 Aug 2009 05:10:33 -0700
To: aeroelectric-list(at)matronics.com
--> AeroElectric-List message posted by: "nuckollsr" <bob.nuckolls(at)aeroelectric.com>
Bundling the wires of different and potentially antagonistic systems is quite practical and in fact a foregone conclusion in the TC aircraft world. There's a suite of tests conducted for all electro-whizzies that quantifies potential victimization/antagonism factors when installed per the manufacturer's instructions.
While building wire bundles for biz jets consisting of a hundred miles of wire and very limited options for wire routing C the LAST challenge anyone wants to address is a requirement for keeping the wires of one system separated from the wires of another system.
The general rule is that unless the manufacturer demands that such separations be established C don't worry about it. It they DO make such demands C you may wish to consider an alternative system. Separation requirements arise from lack of due diligence in crafting an installer and user friendly system. Lack of diligence in issues of environmental co-existence aboard airplanes should make one wonder if other qualities you seek are likewise lacking.
Bob . . .
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=260592#260592
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[quote]
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dave.gribble(at)mchsi.com
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| Posted: Tue Sep 01, 2009 7:50 pm Post subject: Sensor wires with ignition leads |
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My A&P & I installed the EGT & CHT probes in my Skipper (O-235 Lycoming with Slick mags) and ran the wires in the traditional way, in shared adel clamps attached to the bottom of the valve covers, right along with the spark plug wires. No radio noise, no problems with the engine monitor (Electronics International UBG). Hope this data point helps. dave
-------------- Original message ----------------------
From: Bob Barrow <bobbarrow10(at)hotmail.com>
| Quote: |
Bob, I'm building an RV7A (not much guidance from the "manufacturer" on this
issue). Am I to conclude from your comments below that I might be better off
separating the EGT and CHT sensor wires from the ignition leads.
If the sensor wires are run with the ignition leads what possible adversities
might I be facing. Might I get radio noise. Might I get erroneous instrument
readings from the EGT and CHT guages.
Regards Bob Barrow
> Subject: Re: Sensor wires with ignition leads
> From: bob.nuckolls(at)aeroelectric.com
> Date: Mon, 31 Aug 2009 05:10:33 -0700
> To: aeroelectric-list(at)matronics.com
>
>
<bob.nuckolls(at)aeroelectric.com>
>
> Bundling the wires of different and potentially antagonistic systems is quite
practical and in fact a foregone conclusion in the TC aircraft world. There's a
suite of tests conducted for all electro-whizzies that quantifies potential
victimization/antagonism factors when installed per the manufacturer's
instructions.
>
> While building wire bundles for biz jets consisting of a hundred miles of wire
and very limited options for wire routing, the LAST challenge anyone wants to
address is a requirement for keeping the wires of one system separated from the
wires of another system.
>
> The general rule is that unless the manufacturer demands that such separations
be established, don't worry about it. It they DO make such demands, you may wish
to consider an alternative system. Separation requirements arise from lack of
due diligence in crafting an installer and user friendly system. Lack of
diligence in issues of environmental co-existence aboard airplanes should make
one wonder if other qualities you seek are likewise lacking.
>
> Bob . . .
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p 60592#260592
>
>
>
>
>
>
>
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nuckolls.bob(at)aeroelect
Guest
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| Posted: Wed Sep 02, 2009 4:43 am Post subject: Sensor wires with ignition leads |
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At 07:18 PM 9/1/2009, you wrote:
| Quote: | Bob, I'm building an RV7A (not much guidance from the "manufacturer"
on this issue). Am I to conclude from your comments below that I
might be better off separating the EGT and CHT sensor wires from the
ignition leads.
If the sensor wires are run with the ignition leads what possible
adversities might I be facing. Might I get radio noise. Might I get
erroneous instrument readings from the EGT and CHT guages.
|
No . . . CHT/EGT sensors are thermocouples which
are exceedingly low impedance systems and are not
potential victims to the noises which do exist
within and around spark plug wires.
Bob . . .
---------------------------------------
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
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