Fw: Types of Ignitions

[Bruce]

If a CDI has to wait a 1msec for the first restrike it's wasting the
chambers time.
By that I mean any decent distributor system can maintain a 1msec arc, none
stop.

In a msec the kernel should be off, lite, and progressing thru the chamber
by then.

This may help.  For a chemical reaction to start is going to take x amount
of energy.   Once that reaction is started, it's pretty much a done deal.
Now, your going to say what about high swirl chambers, well IMHE it seems
that the really high turbulence ones are rather low rpm engines, or low out
put (Generally, yes there are exceptions).  Now the one real problem child
is a rotary.  They are really high turbulence, but they also have a tendency
of needing to be run rich.

Bruce


From: "William Shurvinton" <shurvinton at orange.net>
Subject: Re: Fw: Types of Ignitions
> US patent 5,456,241 covers something that should do it. Or search USPTO
for
> Michael A Ward. He spends a lot of time thinking about new ways to light
> your fire.
> Basically if you use an IGBT as the switching element, you can turn off
> before you have fully discharged the capacitor and give it another kick.
SCR
> based switches don't turn off until the voltage has dropped to zero, hence
> the 1ms recharge that most CDI offer.
> Would build one, but have waaaay too many projects on the go right now.
> Bill

> From: Tom Sharpe <twsharpe at dmz2.mtco.com>
> > Right on, The extra sparks are so late that they do little except keep
the
> > plugs clean. Retard your spark 10 deg. and see what happens to your
power.
> > I'd like to see someone build a CD that would "ring" the coil (set up a
> > high frequency AC current) for about .005 sec. (5 deg. @ 6000 rpm).
> > Probably take a lot of power, expensive components, and eat up those
> > platinum plugs in 10K miles, but, hey, nothing's free.  Tom
> > PS I want guarantees that the fire is lit.


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