Today's Message Index:
----------------------
1. 09:36 AM - Re: Spark plug wire installation - distance between wires (Robert L. Nuckolls, III)
2. 09:49 AM - Re: Spark plug wire installation - distance between wires (FLYaDIVE)
3. 10:10 AM - Re: Spark plug wire installation - distance between wires (Ed Gilroy)
4. 11:55 AM - Re: Re: Question for Bob (Bill Watson)
5. 05:09 PM - Re: Re: Question for Bob (Robert L. Nuckolls, III)
6. 06:41 PM - Re: MANL's (current limiters) (blues750)
Message 1
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| Subject: | Re: Spark plug wire installation - distance between |
wires
At 01:45 AM 7/24/2018, you wrote:
>Hi,
>
>I've always heard that spark plug wires need
>some small distance between them, and that's
>what I did on my engine, but I'm curious what
>happens if you don't have distance between
>them.=C2 I've seen several certified aircraft
>where the wires were just zip tied together with
>no spacing, and they seem to fly.=C2 :)
>
>Example I just saw on Reddit:
>
><https://i.redd.it/o4e5rmjqktb11.jpg>https://i.redd.it/o4e5rmjqktb11.jpg
>
>Thanks,
>Mickey Coggins
I cannot imagine the physics supporting such an
assertion. Engines running legacy magnetos are
generally fitted with shielded plug wires. Two
wires tied to each other are DOUBLE shielded
for what ever effect the writer is hypothesizing.
Modern electronic ignitions can use automotive
unshielded wire . . . so without shielding, what
is the effect of having two or more wires running
in close parallel for some distance?
Electrostatic coupling (the physics thingy that
calls for shielding) is very weak. The energy
coupled between adjacent wires is a tiny fraction
of that flowing in the wire from ignition source
to the plug . . .
Lacking competent analysis and/or repeatable
demonstrations of deleterious effect, I'll bet
this is yet another ol' hangar yarn . . .
Bob . . .
Message 2
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| Subject: | Re: Spark plug wire installation - distance between |
wires
Micky:
In the old days and even going back to old cars, the space was needed to
prevent cross-over ignition of the spark.
Today, with higher dielectric wires, shielded wires and silicon coated
wires the need for separation in no longer needed.
We are talking Spark Plug Ignition Wires... There IS a need for separation
between Ignition wires and other wires such as EGT & CHT probes/harnesses.
How much separation? I can't say. Maybe the EGT/CHT manufactures state
how much in their install manual.
Barry
On Tue, Jul 24, 2018 at 2:45 AM, Mickey Coggins <mick-matronics@rv8.ch>
wrote:
> Hi,
>
> I've always heard that spark plug wires need some small distance between
> them, and that's what I did on my engine, but I'm curious what happens if
> you don't have distance between them. I've seen several certified aircraft
> where the wires were just zip tied together with no spacing, and they seem
> to fly. :)
>
> Example I just saw on Reddit:
>
> https://i.redd.it/o4e5rmjqktb11.jpg
>
> Thanks,
> Mickey Coggins
>
Message 3
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| Subject: | Re: Spark plug wire installation - distance between |
wires
My problem with the wires bundled together approach is that the zip ties
are very sharp edged when pulled tight and did cut into the wire insulation
over time. This caused an arc over on two adjacent wires over the 1,000
hours time in service on an ElectroAir system that developed this problem.
This problem was elusive until I started moving the bundle around with the
engine running. The zap I got, got my attention...
The picture below is similar to my solution. I did the same thing on a 502
powered Chevelle I have that has an MSD 5 with CDI ignition.
Ed
On Tue, Jul 24, 2018 at 12:36 PM, Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> At 01:45 AM 7/24/2018, you wrote:
>
> Hi,
>
> I've always heard that spark plug wires need some small distance between
> them, and that's what I did on my engine, but I'm curious what happens if
> you don't have distance between them.=C3=82 I've seen several certified
> aircraft where the wires were just zip tied together with no spacing, and
> they seem to fly.=C3=82 :)
>
> Example I just saw on Reddit:
>
> https://i.redd.it/o4e5rmjqktb11.jpg
>
> Thanks,
> Mickey Coggins
>
>
> I cannot imagine the physics supporting such an
> assertion. Engines running legacy magnetos are
> generally fitted with shielded plug wires. Two
> wires tied to each other are DOUBLE shielded
> for what ever effect the writer is hypothesizing.
>
> Modern electronic ignitions can use automotive
> unshielded wire . . . so without shielding, what
> is the effect of having two or more wires running
> in close parallel for some distance?
>
> Electrostatic coupling (the physics thingy that
> calls for shielding) is very weak. The energy
> coupled between adjacent wires is a tiny fraction
> of that flowing in the wire from ignition source
> to the plug . . .
>
> Lacking competent analysis and/or repeatable
> demonstrations of deleterious effect, I'll bet
> this is yet another ol' hangar yarn . . .
>
>
> Bob . . .
>
Message 4
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| Subject: | Re: Question for Bob |
I know the discussion has gone way past this but I ran 2 AWG between
the batteries, contactors, and for the forward run to the starter. All
other 'bus' runs are 8 AWG.
I'll attach a diagram of my Z-14 in my RV10. (2) Odyssey 680s in the
rear along with the 3 contactors. Everything else on the diagram is
forward.
On 7/16/2018 2:00 PM, Rocketman1988 wrote:
>
> So what size wire did you run from the aft battery to the forward buss?
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=481660#481660
>
>
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Message 5
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| Subject: | Re: Question for Bob |
At 01:54 PM 7/24/2018, you wrote:
>I know the discussion has gone way past this
>but=C2 I ran 2 AWG between the batteries,
>contactors, and for the forward run to the
>starter.=C2 All other 'bus' runs are 8 AWG.
>
>I'll attach a diagram of my Z-14 in my
>RV10.=C2 (2) Odyssey 680s in the rear along with
>the 3 contactors.=C2 Everything else on the diagram is forward.
That should play as advertised. Only thing
I would suggest is to make your battery
jumpers from 4AWG welding cable. Very
flexible and entirely sufficient
electrically but MUCH less stress
on the battery connector screws.
Do you have a wire runnig from battery(-)
up to your firewall ground bus?
Bob . . .
Message 6
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| Subject: | Re: MANL's (current limiters) |
Thanks for the reply Bob!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=481833#481833
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