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Date:         Wed, 12 Nov 2003 22:22:14 -0500
Reply-To:     Milo's Kitchen <sagmoore@ZOOMINTERNET.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Milo's Kitchen <sagmoore@ZOOMINTERNET.NET>
Subject:      FW: Cold Starts
Content-Type: text/plain; charset="US-ASCII"

-----Original Message----- From: Milo's Kitchen [mailto:sagmoore@zoominternet.net] Sent: Wednesday, November 12, 2003 10:15 PM To: tom ring Subject: RE: Cold Starts

I agree, I misstated, more voltage will be required to the capacity of the system. However, in the normal scheme of things, age and loss of the dielectric fluid (oil) due to loss of seal, engine bay heat etc, will eventually cause the failure of the coil. What it gets down to is a lack of maintenance of the plugs in the long run, not the materials (platinum or copper or iron alloy) being utilized. A smaller, sharper gap will require less voltage to produce a spark.

Dave

-----Original Message----- From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com]On Behalf Of tom ring Sent: Wednesday, November 12, 2003 9:47 PM To: vanagon@GERRY.VANAGON.COM Subject: Re: Cold Starts

I've seen a couple misunderstandings in this thread.

A plug with a larger gap than specified will force the coil to produce greater than normal voltage to fire. Coil current in this case will generally decrease unless the ignotion system can somehow force more energy into each pulse, which a standard system will not do. The coil will not run hot, but may fail due to insulation breakdown. This may be an intermittent failure, and may be temperature sensitive due to interwinding distance changing.

A plug with a smaller gtap than normal will require less voltage than normal to fire, and will draw greater current. This will cause greater heating of the coil.

Follow old, worn, high gap plugs with new, too tightly gapped plugs...

tom

------ Tom Ring K0TAR, ex-WA2PHW EN34hx 85 Westphalia GL Albert 96 Jetta GL The Intimidator taring@taring.org

"It is better to go into a turn slow, and come out fast, than to go into a turn fast and come out dead." Stirling Moss


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