Ignition only

Peter Gargano peter at techedge.com.au
Tue Nov 7 21:09:17 GMT 2000


Bruce Plecan wrote:
> 
> > Aside from simplicity and reliability, is there a measureable
> > advantage to running DIS vs. just dizzy, assuming, of course, both are
> > ECM controlled?
> 
> Upside one less air gap to cross.

Only a coil-per-plug system will give you "one air gap" per spark event.

For each spark event:

  Distributor system has a spark gap at the distributor and one at the plug.

  Traditional DIS has a spark gap at both plugs of any one coil pack.

And yes, it's true that a DIS system will fire one plug if the other plug
is open circuit - because of the capacitive path to ground thru' the coil
pack and other plug lead.

Peter.
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