Ignition only

[Darryl & Karen Smith]

yes, you are, return path is to to the source which is the other secondary
side of the coil, not the chassis, the only return path being the opposite
plug and coil.   Look at the circuit and you'll understand.  It's an
inductive circuit and therefore it's only connection with the 12volt side of
the vehicle is through the magnetic field of the coil.

----- Original Message -----
From: <Rodney_L_Wiggins at keybank.com>
To: <diy_efi at diy-efi.org>
Sent: Friday, November 10, 2000 7:48 AM
Subject: Re: Ignition only


>
>
> I'm having trouble understanding the concept of firing the second plug
> backwards.
> After the spark jumps the gap on the first plug, isn't the "path of least
> resistance"
> going to be head-block-chassis instead of trying to jump the airgap of the
> second
> plug?? (compressed or otherwise). I'm probably missing something basic
here.
>
> TIA
> Rod
> 944 turbo (+NOS and big Turbo)
> only 7000 RPM so 1 coil 1msd. (sufficient??)
>
>
>
>
> >0ne difference I didn't see mentioned is that waste spark systems
> >fire one plug "backwards". (Normally the hot center electrode is
> >negative, since it's electrons being emitted that actually start
> >things off, as in vaccum tubes.) This probably means that the plug
> >gap in those cylinders cannot be as large as in a "forward"
> >cylinder, but I'm not sure if this is a meaningful difference or
> >not.
>
>
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