> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> Of Oli Glaser
> Sent: 04 April 2011 19:55
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE] seeking introductory notes on DIY plasma ignition
>=20
> On 04/04/2011 19:37, Sean Breheny wrote:
> > Hi Al,
> >
> > That's a good point (about aircraft). The standard procedure is to
run
> > with BOTH ignition systems on all the time except when testing them.
> > During the engine run-up on the ground, one of the steps is to
switch
> > to only the LEFT system and make sure that the RPM doesn't change by
> > more than a set amount (perhaps 50 rpm out of 800 rpm). Then you
> > switch to only the RIGHT system and watch the rpm again. Finally,
you
> > switch back to BOTH. It is considered very normal to see a slight
dip
> > in the rpm while only one of the systems is on.
> >
>=20
> Okay, I have a question then. If the idea is to produce a
bigger/longer
> spark, then why not simply use multiple sparkplugs in the bike also?
> I realise there will only be "room" for one per cylinder in a standard
> engine, but maybe it would be possible to design a custom plug with
two
> spark gaps. They could either be fired at the same time or slightly
apart.

If you had two spark gaps in one plug they would be separated only by a
very short distance, so any advantage of dual flame fronts would be
lost.  The point of a twin spark system (apart from redundancy in
aircraft applications) is to reduce the time taken to burn the charge by
starting two flame fronts, meaning less ignition advance is required
(which is always a good thing).

Regards

Mike

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
This e-mail is intended for the person it is addressed to only. The
information contained in it may be confidential and/or protected by
law. If you are not the intended recipient of this message, you must
not make any use of this information, or copy or show it to any
person. Please contact us immediately to tell us that you have
received this e-mail, and return the original to us. Any use,
forwarding, printing or copying of this message is strictly prohibited.
No part of this message can be considered a request for goods or
services.
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.