[AT] grounded coil

[charlie hill]

Chris,  I doubt if Larry will respond to your question but I will.
When you address Larry you are addressing Larry D. Goss
Professor Emeritus, Engineering Technology
University of Southern Indiana

I don't know if he is an electrical engineer.  I don't think he is but I can 
assure you that he knows what he's talking about and wouldn't have said it 
if he didn't.

Charlie


----- Original Message ----- 
From: "Chris Britton" <c.britton at worldnet.att.net>
To: <at at lists.antique-tractor.com>
Sent: Thursday, August 30, 2007 3:43 PM
Subject: [AT] grounded coil


> Larry.. don't take this follow comment the wrong way.. but do you have any
> electronics background?  Draw out a simple ignition circuit design... your
> 'coil' circuit will have 3 connections.. 2 for the primary and a 3rd for 
> the
> secondary.
>
> Your primary needs power and ground.  Since the points are mounted in the
> distribuitor.. the points are ground.  that just leaves power.. and then 
> the
> secondary line to the plug(s)
>
> About the only thing I can come up with is some older style system that
> might possibly use an impulse pickup and or an old coil box.. not anything
> more modern.. say.. from 1939 and up.
>
> Be specific.. if you've got some circuit schematics.. or can cite an 
> example
> of a modern points based ignition system that uses a coil that is grounded
> .. IE.. the coil container is ground.. and is an integral part of the
> system... post them.  There are at least a couple of us here that wouldn't
> mind seeing them.
>
> I'm envisioning you would need isolation at the points ( from the
> distribuitor, or from the distribuitor from the block? ) to have them
> function as anything other than grounding breaker contacts.
>
> Also.. lets narrow the scope of this down.  I'm also assuming a round can
> coil or similar application that has 2 primary wires and a secondary high
> tension tower.. etc...  Ans is an external unit.. not an integral part of 
> a
> complete unit.. like in a magneto.. etc.  As we are talking about mounting
> it to an engine.. etc..
>
> ( again.. this is not meant to be inflamitory.. or antagonistic.. just
> asking you what you are basing your claims on... we've shown our cards.. 
> now
> it time to call.. )
>
> Soundguy
>
>>From: "Larry D Goss" <rlgoss at evansville.net>
>>Subject: Re: [AT] grounded coil
>>Well, I don't want to get into a rock throwing contest.  Marshall Brain is
>>a
>>nice guy and we're both members of the same club sponsored by NCSU
>>(literally), but everything that appears in his website is not universal.
>>I
>>still stand by my statement that some ignition coils HAVE to be grounded 
>>to
>>operate.  Just because you haven't come across any, doesn't mean they 
>>don't
>>exist or even that they're rare.
>
>>Larry
>
>
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