Today's Message Index:
----------------------
1. 06:01 AM - Re: Coil lead Conversion (Kelley Monroe)
2. 08:17 AM - Re: Coil lead Conversion (Bitterlich, Mark G CIV NAVAIR, WD)
3. 09:02 AM - Re: Coil lead Conversion (Dale)
4. 02:48 PM - Re: Canopy (airmanv2)
Message 1
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| Subject: | Re: Coil lead Conversion |
Thanks for the help. I was just trying to return the system back to the
stock configuration. The person that installed the auto plug conversion
removed the stock assembly and installed an 8MM lead with no nuts on either
end. Thanks again, Kelley
----- Original Message -----
From: "Cpayne" <cpayne@joimail.com>
Sent: Saturday, March 22, 2014 6:19 PM
Subject: Yak-List: Coil lead Conversion
>
> Kelly and anyone else,
>
> I have a conversion for the starting coil wire that insures a hot starting
> spark; and I have been using it for a several years now. Radio shielding
> is not required since you never have the radio on until the the engine is
> running. By that time,the starting coil is no longer engaged. I use solid
> core Packard 440 wire and some lathe-turned bits and pieces to make it
> work. I have not developed it to something I could market because there is
> nothing wrong with the stock system....if you have the parts.
>
> And if you can't get the parts, that's when I will put something together
> for sale. Not rocket science, just remember that you don't need the
> shielding with systems off and mags off during the start.
>
> Craig Payne
>
>
>
Message 2
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| Subject: | Coil lead Conversion |
Craig, I think your conversion is well done, but let me offer another point of
view regarding shielding. I understand how your initial thought might be: "Why
put in shielding when the starting coil is not in use once the engine is running?".
I get that, and it makes sense if you think the only thing making "noise"
is that starting coil.
However, that really is not the case when it comes to broad band noise that is
created by spark energy. You'll notice that the original Russian design included
shielding and those folks knew what they were doing. Inside of the mag is
the distributor rotor and the cap, along with points and mag coil itself. Every
time this device fires a spark plug, there is a HUGE amount of broad band
noise inside that housing. Ok.... keep that thought in mind for a second.
The wire coming from the starting coil runs INTO the cap of the mag, and it then
connects to the retarded rotor point that is about an inch away from the "run"
rotor point. This is like a little antenna sticking right into the noise field
of the mags internal workings. That noise will couple into the wire that
connects back to the starting coil and the whole deal will act like a nice little
antenna and radiate energy in every direction.
Broad band ignition noise from mags is a cumulative thing... it adds up. When
you first experience just a little bit, it will only be heard on weak signals.
Then as it becomes stronger the noise will be heard on stronger and stronger
signals, until it is so bad that you can hear it all the time, signals being
received or not.
So with respect, every single wire coming into or out of a mag should be shielded.
The exception to this rule is the new very high tech ignition wire used in
Dennis Savarese's conversion kit. And even as high tech as it is, it does add
a very small amount to ignition noise heard in a radio, and let me also say
it depends on the type of radio you are using as well. For example the Becker
radios are very susceptible to noise of any kind. So... good engineering practice
strongly suggests that wire be properly shielded.
As regards shielding wire. If you can't find good shielding wire anywhere, then
simply purchase some RG-213 coax. Split the outer jacket with a knife to get
started, and then just rip it off. This will expose the coax shield. Carefully
slide it off. Slide it back over your new wire in the airplane, then
pull each end tight to tighten it over the wire being shielded. Put another layer
on top of that just to make it even better.
Mark Bitterlich
________________________________
From: owner-yak-list-server@matronics.com [owner-yak-list-server@matronics.com]
on behalf of Kelley Monroe [kelmonroe@comcast.net]
Sent: Sunday, March 23, 2014 8:55 AM
Subject: Re: Yak-List: Coil lead Conversion
Thanks for the help. I was just trying to return the system back to the
stock configuration. The person that installed the auto plug conversion
removed the stock assembly and installed an 8MM lead with no nuts on either
end. Thanks again, Kelley
----- Original Message -----
From: "Cpayne" <cpayne@joimail.com>
Sent: Saturday, March 22, 2014 6:19 PM
Subject: Yak-List: Coil lead Conversion
>
> Kelly and anyone else,
>
> I have a conversion for the starting coil wire that insures a hot starting
> spark; and I have been using it for a several years now. Radio shielding
> is not required since you never have the radio on until the the engine is
> running. By that time,the starting coil is no longer engaged. I use solid
> core Packard 440 wire and some lathe-turned bits and pieces to make it
> work. I have not developed it to something I could market because there is
> nothing wrong with the stock system....if you have the parts.
>
> And if you can't get the parts, that's when I will put something together
> for sale. Not rocket science, just remember that you don't need the
> shielding with systems off and mags off during the start.
>
> Craig Payne
>
>
Message 3
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| Subject: | Re: Coil lead Conversion |
An adapter I make to convert Taylor ignition using Cj or Yak start lead.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=420888#420888
Attachments:
http://forums.matronics.com//files/2014_02_07_18_09_57_776_2_102.jpg
Message 4
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Hi Walt,
I've done it today,
thank you for help
Bruno
--------
Fly safe
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=420897#420897
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