Re: Dual Ignition coil on Scirocco

[Richard Fenton <ldfen1@lisco.com>]

ChuckKuecker wrote:
> 
> At 13:31 6/30/97 -0500, you wrote:
> >At 12:21 AM 6/30/97 -0500, you wrote:
> >>***lurk mode off***
> >>I want to put an extra coil on my ITC Scirocco.  If I want to be able to
> >>switch over to the spare quickly, can I attach the negative poles, and the
> >>positive poles together, and only have to change the coil-distributor wire?
> >>Or must I change all wires to
> >>
> >>the new coil when needed?  I've seen dual coils on race cars before, but
> >>never really paid that much attention.
> >>BTW, it is a stock Bosch points ignition.
> >>tia
> >>***lurk mode on***
> >
> >
> >The way I understand that the big boys do it is, they have basically an A-B
> >switch. the coil wires both run to this switch as do the wires. Then if they
> >have a problem, they simply flick a switch to the second ingnition system.
> This
> >is on the entire ignition systen tho, so yours may be much easier to build.
> >
> >My first thought would be to have 2 A-B switches. one for the coil wires and
> >one for the -/+ wires. (Or would this require 3 switches? I dunno, its been a
> >while since ive clammered through radio shacks electrical inventory...)
> Anyways
> >this could be dash mounted easily, I would think.
> >I've never done it, never seen it done or even seen a finished unit. I just
> >know it look really good in my head.
> >HTH!!
> >
> >
> >Shawn
> 
> You can hook up one wire (+ or -) to both coils - but you can NOT keep both
> coils in the circuit at once. The unconnected (coil wire) unit will arc over
> and destroy itself in short order. Also, two coils might overload the
> ignition module, or burn up the points. The minimum would be an 'A-B' switch
> in the other wire to the coil.
> 
> Anytime you crank an engine with the center wire out of the distributor,
> it's a real good idea to ground this wire. It won't hurt the coil, but
> avoids that arc-over problem, and you don't have to worry about getting zapped!
> 
> The high voltage coil lead is special. I don't know of any switch from Radio
> Shack or elsewhere that will withstand spark voltages. I would simply swap
> the coil wire from the bad unit to the good one when you need to..
> 
> Even if you find an 'A-B' swith for the high tension lead, it would not be a
> good idea to make the wires any longer than absolutley necessary. Long high
> voltage wires tend to leak energy.
> 
> Do the race guys use this as a backup system they change in the pit. or can
> they swap on the fly? Something like aircraft engines with dual plugs and
> dual distributors, maybe?
> 
There's a good idea, I could probably find you a set a Cessna Magnetos.
Course then youd have to do a preflight check of both the left and right
for the proper RPM drop.:)
> Chuck Kuecker
> 
> ckuecker@mcs.net
> 
> '83 Scirocco (in process)
> '58 Ghia Convert
> '75 Bug (rusty!!)
> '67 Bug
> '63 Bug
> '91 Vanagon
> 
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