Date: Mon, 21 Nov 2016 00:46:49 +0000
Reply-To: David <fjazzbass@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: David <fjazzbass@GMAIL.COM>
Subject: Re: Generic ignition coil on 1.9?
In-Reply-To: <CY1PR20MB00299F7C41C83B944409A871A0B20@CY1PR20MB0029.namprd20.prod.outlook.com>
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Thanks all for your input- I KNEW I had seen something with the following
verbiage-
"Do NOT replace ignition coil with conventional type coil."
And I just found it- 24.42 .... I wasn't sure if it applied to the 1.9
because at the bottom of the page it says Digifant, and at the top of the
page it says FUel injection, AFC system....
Thanks for confirming what I'd already seen.
Dave
On Sun, Nov 20, 2016 at 10:39 AM Dennis Haynes <d23haynes57@hotmail.com>
wrote:
> The issue isn’t just using a Bosch coil as in brand name but in a coil
> that has the correct electrical characteristics. Ignition coils come in
> many different designs. Even going back to the days of points and
> condensers there were coils the would be directly connected to battery
> voltage (Most VW) and coils that needed current limitation (Chrysler) with
> ballast resisters.
>
> An ignition coil is a bit of a magic device. Basically it is a transformer
> but the magic is it is used a direct current application. As such the
> primary side is basically a short. The process works as follows:
> Current flows, the coil builds up a magnetic field.
> Current stops, the filed collapses and inductance causes the secondary
> side to create the high voltage. This is when the spark plug is fired.
>
> Now the compromise part is getting the coil to coil to operate at low
> speeds (long dwell period with the points closed) and still create adequate
> spark energy at high speeds, (less time between sparks).
>
> So with the electronic ignitions in our Vans, Both 1.9 and 2.1 the system
> varies the dwell so that the proper coil can deliver the required energy at
> all speeds. Using the wrong coil can reduce output. Also, if it draws too
> much current or has damaging inductive properties on the primary side it
> can damage the ignition module. This can be painful on the 2.1 as this
> means ECU replacement.
>
> Also consider the ignition is not fuses. Short the coil and the ignition
> module and the wiring damage begins quickly.
>
> So unless you are into experimenting your best bet is to get the correct
> coil. Shop around. When was does fail you need to ask why.
>
> Dennis
>
>
>
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf
> Of David
> Sent: Saturday, November 19, 2016 3:38 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Generic ignition coil on 1.9?
>
> Troubleshooting some running issues with my 1.9- could have sworn in the
> Bentley somewhere it said to only use Bosch ignition coils- mine is just
> one of those goofy yellow generic ones...primary ignition wire off of that
> coil was really ugly- clip broke off when taking it off.
>
> Am I crazy for thinking that I have to use a Bosch on this thing? Or did I
> actually see that somewhere- I can't seem to find it in either the Digijet
> or Digifant section...
>
> Thanks
>
> Dave
> 85 GL 1.9er
>
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