I Built a CD Ignition 1st back in 1965 for my VW, and then for my 1970
ford Torino wagon, in both cases the points were not touched for over
100,000 miles and they both ran much better, I now have one (home built) on
the healey, the only thing I found out there is a small amount of point
bounce in the healey and this played havoc with the CD ignition, so also
installed a pertronics to fire the CD ignition, It now works great and I
have gained about 2 to 3 miles to the gallon.
Here is the details of the Home built unit.
http://picasaweb.google.com/bj7healey/SolidStateCDIgnition#
Also have put a brochure on Lucas generator control boxes at this web
address
http://picasaweb.google.com/bj7healey/LucusGeneratorControlBoxes#
I have many Tech Tips at this address
http://picasaweb.google.com/bj7healey
Bob 1963 BJ7
--------------------------------------------------
From: "Richard Ewald" <richard.ewald@gmail.com>
Sent: Wednesday, May 12, 2010 11:14 PM
To: "Alan Seigrist" <healey.nut@gmail.com>
Cc: "Healey" <Healeys@autox.team.net>
Subject: Re: [Healeys] Lucas - Judson EI ??
Actually if you think about it, all points equipped systems use the points
as a switch that turns the coil on and off. The difference is that in a
traditional points system the points are switching a bunch of amperage (6
amps comes to mind, but my memory could be failing). Switching this high
current caused points to pit and wear out. In an effort to make points
systems more reliable, first came transistorized ignition systems which
used
the points at a very low voltage and amperage to switch a transistor, which
then switched a power transistor to turn the coil on and off. With these
systems point arcing is eliminated. Assuming the rubbing block stays
lubed,
the points will last many many times longer than the a traditional system.
A capacitive discharge system or CD as they were known adds a big capacitor
to the system to kick the power out of the coil up to either a higher
voltage, or a longer spark duration. Still the points act as a switch to
turn a transistor on and off.
So what is this Judson unit?
Beats the crap out of me. I do not believe it is a capacitive discharge
system for a couple of reasons.
1. Look at the wiring schematic The wire from the coil is still going to
the points The points are switching the current from the coil. Not like
any transistorized system I ever saw. Not like any CD system I ever saw.
2. the name See-dee. Sounds like CD but note the spelling is different.
Back in the day everyone called them CD systems and when written it was
always CD. Never see-dee.
I'm thinking that this is just one more item in a long line of snake oil
that has been sold to car owners under the guise of more performance,
better
gas mileage, lower emissions.
Rick
_______________________________________________
Healeys@autox.team.net
Donate: http://www.team.net/donate.html
Suggested annual donation $12.75
Archive: http://www.team.net/archive
Forums: http://www.team.net/forums
|