Ign Advance on MR-2

[Diehl, Jeffrey]

I remember reading about such a system.  They send a current across each
plug in a pair after firing to see which one was on it's compression stroke.
The one which had just ignited would conduct; the other would not.

This way, they didn't need to have a mechanical means of keeping track of
cyl. #1.

Mike Diehl.

-----Original Message-----
From: Bruce
To: diy_efi at diy-efi.org
Sent: 8/22/2000 1:05 PM
Subject: Re: Ign Advance on MR-2


From: "Camden Lindsay" <cjl169 at hotmail.com>
Subject: Re: Ign Advance on MR-2
> >Ford Zetec engines are fitted with a neat double coil assemby with 4
HT
> >leads which is ideal for a home-brew DIS. The only production DIS I
know
of
> >with 4 coils was a coil-on-plug system by (if I recall
correctly)Volvo.
> I believe it is the Saab DIS... which uses a secondary spark after
ignition
> to check ionization within the cylender, and to tell a whole bunch of
> differnet things (knock, pressure, rich/lean??,etc).. each coil- on -
plug
> pack houses (or so i've read) a capacitor that is used for the
secondary
> spark.....

I thought they immediately applied 80v to the HV wiring to use as a
sensor.
Bruce

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