Switches or relays?

[bcroe at juno.com]

I don't understand why you are trying to do this.  Why 
double the amount of hardware?  But the idea is 
completely impractical.  For one, the 2 coil outputs
are opposite polarity, so shorting them together will
kill the output.  Try shorting the unused one to ground.
Relays that move fast enough to follow an engine are
pretty rare, you'd need a new electronic driver.

Bruce Roe

On Thu, 8 Nov 2001 15:23:14 -0800 (PST) Mark Bottorff
<bottorffinator at yahoo.com> writes:
> They are made for firing it batches. I'm wanting to
> make them fire one plug at a time by using 6 coil
> packs and using 3 switches/relays. Like this:
> 
> ||x|| ||x|| ||x||
> \/ \/ \/ \/ \/ \/
> |  |  |  |  |  |
> 
> The x's are the switches/relays. What I need to know
> is if they is a relay or switch that accomodate this
> setup. And if you can Y the 2 leads on each coil pack
> together to one plug.
> 
> Thanks,
> Mark Bottorff
> 
> --- Jim Blackwood <jblackwood5 at home.com> wrote:
> > Normally you can use one coil to fire two plugs at
> > the same time if they're
> > made for it. The 'waste' spark is on the exhaust
> > stroke.
> > 
> > -----Original Message-----
> > From: owner-diy_efi at diy-efi.org
> > [mailto:owner-diy_efi at diy-efi.org]On
> > Behalf Of Mark Bottorff
> > Sent: Thursday, November 08, 2001 1:52 PM
> > To: diy_efi at diy-efi.org
> > Subject: Switches or relays?
> > 
> > 
> > I have some ideas about using batch fire coil packs
> > sequentially and using the Megasquirt for sequential
> > EFI.
> > 
> > Coil packs:
> > On my car ('88 Supra turbo) there are 3 sets of coil
> > packs that fire 2 plugs at a time. There is a
> > seperate
> > connector for each coil pack. If I got another set
> > of
> > coil packs, and plugged the connectors into some
> > sort
> > of relay that would switch between coil packs as
> > they're actived, it would fire one plug at a time.
> > The
> > problem is that there would be an empty spot for
> > another plug wire. If I were to "Y" 2 plug wires
> > together, would I get twice the spark, or that blow
> > the coil packs?
> > 
> > Sequential EFI:
> > Using the same sort of relay from above, but with 3
> > outs and and one in (for a 6 cylinder), couldn't you
> > make the Megasquirt fire one injector at a time?
> > 
> > Now the big question, does such a relay or switch
> > exist?
> > 
> > Thanks,
> > Mark Bottorff
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