ION-related IGN Comments & Coil Quest

[Webb Family]

You specify "Auto". I wonder why...

It is common to have a snowmobile coil hooked up so that one side of the HV
winding goes to one of the plugs (most snowmachines are 2 cylinder) with the
other side going to the other plug. Both plugs fire each time, only one is
firing on a dead cylinder. That puts both ends of the HV coil out and isolated.
That's what you want, right??

Try Kirk snowmobile for parts...


Bruce Plecan wrote:

> -----Original Message-----
> From: Chris Rhodin <chris at imageio.com>
> Subject: RE: ION-related IGN Comments & Coil Quest
>
> Aren't those wasted spark coils that GM uses 4-wire coils?  You would just
> use twice as many as GM and tie the other HV terminal to the ion-current
> bias generator (an 80v zener that can handle the peak spark current and a
> capacitor).
>
> I think the hardest problem to solve for the ION sensor is going to be
> overcoming the high-voltage nature of all the components in the system.  By
> this I mean everything is designed to work with several thousand volts
> applied, so nobody making parts (wires, plugs, connectors) really cares if
> there is a connection at 80 volts.  There are even sparkplugs out there that
> have an intentional gap in the body.
>
> Once upon a time the staff at CSH HQ used to spend hours looking for the
> lowest resistance of the resistance type sparkplugs.  As far
> as on purpose gap, I've never seen that in AC, Champion, or Autolite.
> This was about 10 years ago, however.
>
>  And even if you get everything installed and working  you still will be
> adding a failure mode to the system (if a small gap opens you still get a
> spark but no ION current will flow).  I'm certain this is why Saab uses
> those cute coils that connect right to the plug.
>
> Chris Rhodin
> chris at notav8.com
>
> ----------
> From: garfield at pilgrimhouse.com
> Sent: Wednesday, May 27, 1998 16:05
> To: DIY_EFI
> Subject: ION-related IGN Comments & Coil Quest
>
> Thas all fer now. Scan yer personal archives and see if you've ever seen
> a "4-terminal" IGN coil. Any feedback appreciated.
>
> Gar