[AT] Project Updates '49 A, '51 A, and '47 B (STEVE ALLEN)

[szabelski at wildblue.net]

Sorry, hit the send button before finishing on the previous message. To complete the last sentence......

That would be equivalent to putting the resistor into the circuit, only the resistor would be in each spark plug wire. With the differences in length of the spark plug wires I don’t think this would be ideal. You would probably have to maintain a minimum length as well as a maximum length in order to have the resistance close to what there would be for a coil with an internal resistor.

Carl


----- Original Message -----
From: szabelski at wildblue.net
To: Antique Tractor Email Discussion Group <at at lists.antique-tractor.com>
Sent: Mon, 11 May 2020 15:47:14 -0400 (EDT)
Subject: Re: [AT] Project Updates '49 A, '51 A, and '47 B (STEVE ALLEN)

Again if I remember correctly, I think I read somewhere were you could use a coil without an internal resistor if you replaced the standard spark plug and coil wires with resistive wires. That would be equivalent to putti

Carl
----- Original Message -----
From: Howard Pletcher <hrpletch at gmail.com>
To: Antique Tractor Email Discussion Group <at at lists.antique-tractor.com>
Sent: Mon, 11 May 2020 12:10:51 -0400 (EDT)
Subject: Re: [AT] Project Updates '49 A, '51 A, and '47 B (STEVE ALLEN)

You are correct Carl.  A 12V system takes a 12V coil with an internal
resistor or and external 1.4 ohm resistor commonly called a ballast
resistor can be used with a 6V coil.    These are available at most auto
parts stores.   This is to avoid burning the points as you say.

Howard

On Mon, May 11, 2020 at 11:14 AM <szabelski at wildblue.net> wrote:

> Cecil,
>
> My Farmall H, 4 cylinder, was converted from 6V to 12V by the PO. I use a
> coil with an internal resistor.
>
>  I remember reading some articles on doing a 6V to 12V conversion when I
> had to replace the coil at one time and needed to figure out what I needed
> for the new coil. My understanding, if I remember correctly, is that
> without the internal resistor the points will burn out a whole lot quicker.
>
>
> Carl
>
>
>

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