Multispark stuff and other thoughts

[Jim Pearl]

My biggest interest would be to find a system that would allow me to fire 
my EFI HO Ford motor on a waste spark system. I've been told by a guy here 
that he's done this using some weird rotor out of another Ford application 
that would fire the opposing cylinders. Since this guy is 90% B.S. I've 
never been sure he was right and frankly I'd think the spark would take the 
least resistive path anyway... Any ideas? I'm using an Accell 300+ system 
now after my MSD died (5 years old). So far I've not gotten it out on a dry 
road while running right (plug problem) but I can tell you it ran poorly 
without the MSD - it was very noticeable. Couldn't even spin the tires in 
second from a roll much less third. Power was way down... I think the 
Accell has restored the power and it's tiny - very nice!

----------
>From: 	Clinton L. Corbin : Backgrind/Gold : Pager 
0544[SMTP:CCORBIN at INTEL7.intel.com]
Sent: 	Thursday, March 28, 1996 4:31 AM
To: 	diy_efi at coulomb.eng.ohio-state.edu
Subject: 	Multispark stuff and other thoughts

Folks,

Just thinking.  The MSD units go to single spark at around 3k, right?
If I am not mistaken, all of these units only use one coil to fire up
to eight cylinders.  Therefore, the COIL is still firing four times per
revolution anyway.  Almost all of the ignition systems proposed to date
only fire at the most once per rev (wasted spark systems).  Some even
want to use one coil per cylinder!  It would appear that we should be
able to implement a multispark system that goes to much higher revs than
the MSD unit.  How many sparks per event would depend upon the coil
charge and discharge time, but we all want to charge with real high
currents anyway....  Just some thoughts on the subject.

As an aside to this, there has been a lot of bandwidth spent on the
subject of one coil per cylinder.  To tell you the truth, I do not see
any advantage of one coil per cylinder over one coil per two cylinders.
The exception being extremly high RPM (10000+) motors.  The proposals to
date have all involved much extra hardware and software complexity to
impliment.  What justifies this?  (Don't take that wrong.  I do not see
how it is justified and I was wondering how the folks who are for it see
things)  I must give it one thing:  It looks really sharp!  Not to mention
you can put the coil almost right on the plug to minimise RF emisions and
power lose to the plug.  But anyway, were's the beef?

Clint
ccorbin at intel7.intel.com





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