Date:         Sun, 26 Oct 2014 23:16:07 -0500
Reply-To:     Tom Hargrave <thargrav@HIWAAY.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Tom Hargrave <thargrav@HIWAAY.NET>
Subject:      Re: Coil boil
Comments: To: KI4TLF <ki4tlf@GMAIL.COM>
In-Reply-To:  <010401cff199$56917fa0$03b47ee0$@com>
Content-Type: text/plain; charset="utf-8"

I know exactly what you are talking about and just about every USA car manufacturer used the same solution into the early 70's. The ignition coils were 6 - 9 V with a ballast resistor in series. When you started the car the ignition switch applied 12 V directly to the coil, boosting the spark for an easier start. When you let go of the switch the coil went back to its operating voltage.

Here is another one. My 1976 BMW K75/6 has two 6V coils, one for each cylinder. They were wired in series from the factory but it was common practice to rewire the coils in parallel for better spark & even some dealers did this. Mine are wired in parallel. I re-wired them in series and the bike needed the enricher to start when cold, so I re-wired them in parallel and it's been that way for the past 15 years.

Thanks, Tom Hargrave
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-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@GERRY.VANAGON.COM] On Behalf Of KI4TLF
Sent: Sunday, October 26, 2014 10:52 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Coil boil

I've run into it before when the coil was supposed to have an inline resister to step down the voltage, but didn't.  Mainly on older Chrysler vehicles.  At that time, it would get hot enough to leave a blister if touched for more than a couple of seconds.

GregM

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Bruce Todd
Sent: Sunday, October 26, 2014 5:39 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Coil boil

I just recently had some work completed on my Syncro Westy which included a new coil for a 2.1 digifant  - when I got home from the mechanic (about a
15 minute drive) and shut down the motor,  I decided to touch the new coil and was surprised at how hot it felt  - I could not touch it for any length otherwise I would have burned my hand.

This is a new silver Bosch coil - is this normal?

Thanks,

Bruce

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