Looking for Capacitive Discharge Ignition systems FAQ's, etc

  • Thread starter Mike Rocket J. Squirrel E
  • Start date
M

Mike Rocket J. Squirrel E

Guest
Schematics, DIY articles and/or kits, "How they work" articles for CDI
systems. Need a primer and some discussions of working examples.

--
Mike "Rocket J Squirrel" Elliott
71 VW Type 2 -- the Wonderbus (AKA the Saunabus in summer)
KG6RCR
 
"Mike Rocket J. Squirrel Elliott" <j.michael.elliottAT@REMOVETHEOBVIOUSadelphiaDOT.net>
wrote in message news:sdWdnS1bi6_63Ord4p2dnA@adelphia.com...
Schematics, DIY articles and/or kits, "How they work" articles for CDI
systems. Need a primer and some discussions of working examples.

--
Mike "Rocket J Squirrel" Elliott
71 VW Type 2 -- the Wonderbus (AKA the Saunabus in summer)
KG6RCR
Click to expand...
You can do a search on Megasquirt which combines the injection ECU and now the ignition
ECU. Megasquirt is a DIY type of system.

I use a Crane HI-6R in my race car, the "multi-spark" only really occurs at low RPM, not
at WOT (features rev limiters, retard on boost, etc..) another CDI system is the MSD
ignition system.

Unless you are racing or making serious amounts of horsepower, it isn't necessary.
However, if you want reliability, you can convert your application to injection (using
throttle bodies) and use the Megasquirt and crank trigger ignition and you'll have a sweet
system.

--
Myron Samila
Toronto, ON Canada
Samila Racing
http://204.101.251.229/myronx19
 
On Fri, 09 Apr 2004 17:35:52 -0700, "Mike Rocket J. Squirrel Elliott"
<j.michael.elliottAT@REMOVETHEOBVIOUSadelphiaDOT.net> wrote:

Schematics, DIY articles and/or kits, "How they work" articles for CDI
systems. Need a primer and some discussions of working examples.
Click to expand...
See "CD-Ignition-Basic.pdf" on the S.E.D/Schematic Page of my website.

This represents the fundamentals of an ignition system I designed for
Ford in the early '70's, but they fretted over its cost and short
spark duration. I even designed a version with multiple-sparks per
firing... they still didn't like it. Ran just fine on several cars
here in AZ.

I don't have the current sensing circuitry in CAD. If I can find my
pencil drawings I'll post additional information.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
"Jim Thompson" <thegreatone@example.com> wrote in message
news:ruti7051fuugumm49sgdblglchg38iro9j@4ax.com...
On Fri, 09 Apr 2004 17:35:52 -0700, "Mike Rocket J. Squirrel Elliott"
j.michael.elliottAT@REMOVETHEOBVIOUSadelphiaDOT.net> wrote:

Schematics, DIY articles and/or kits, "How they work" articles for CDI
systems. Need a primer and some discussions of working examples.

See "CD-Ignition-Basic.pdf" on the S.E.D/Schematic Page of my website.

This represents the fundamentals of an ignition system I designed for
Ford in the early '70's, but they fretted over its cost and short
spark duration. I even designed a version with multiple-sparks per
firing... they still didn't like it. Ran just fine on several cars
here in AZ.

I don't have the current sensing circuitry in CAD. If I can find my
pencil drawings I'll post additional information.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
Click to expand...
See the pages at:

http://autoxer.skiblack.com/rayignition.html
http://www.st.com/stonline/books/pdf/docs/4347.pdf
http://perso.wanadoo.fr/transmic/fichiers/cdi4347.pdf
http://ourworld.compuserve.com/homepages/JET_AV8R/Vision/Ignition/CDI.HTML

--
Dave M

Good judgement comes from experience, and a lot of that comes from bad
judgement.
 
Jim Thompson wrote:

On Fri, 09 Apr 2004 17:35:52 -0700, "Mike Rocket J. Squirrel Elliott"
j.michael.elliottAT@REMOVETHEOBVIOUSadelphiaDOT.net> wrote:


Schematics, DIY articles and/or kits, "How they work" articles for CDI
systems. Need a primer and some discussions of working examples.


See "CD-Ignition-Basic.pdf" on the S.E.D/Schematic Page of my website.

This represents the fundamentals of an ignition system I designed for
Ford in the early '70's, but they fretted over its cost
Click to expand...
Cost must be in the current-sense part, because one BJT, one coil, one
cap and three diodes is pretty minimal. Thanks for the post, Jim.

and short
spark duration. I even designed a version with multiple-sparks per
firing... they still didn't like it. Ran just fine on several cars
here in AZ.

I don't have the current sensing circuitry in CAD. If I can find my
pencil drawings I'll post additional information.

...Jim Thompson
Click to expand...
--
Mike "Rocket J Squirrel" Elliott
71 VW Type 2 -- the Wonderbus (AKA the Saunabus in summer)
KG6RCR
 
Tweetldee wrote:

"Jim Thompson" <thegreatone@example.com> wrote in message
news:ruti7051fuugumm49sgdblglchg38iro9j@4ax.com...

On Fri, 09 Apr 2004 17:35:52 -0700, "Mike Rocket J. Squirrel Elliott"
j.michael.elliottAT@REMOVETHEOBVIOUSadelphiaDOT.net> wrote:


Schematics, DIY articles and/or kits, "How they work" articles for CDI
systems. Need a primer and some discussions of working examples.

See "CD-Ignition-Basic.pdf" on the S.E.D/Schematic Page of my website.

This represents the fundamentals of an ignition system I designed for
Ford in the early '70's, but they fretted over its cost and short
spark duration. I even designed a version with multiple-sparks per
firing... they still didn't like it. Ran just fine on several cars
here in AZ.

I don't have the current sensing circuitry in CAD. If I can find my
pencil drawings I'll post additional information.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.


See the pages at:

http://autoxer.skiblack.com/rayignition.html
http://www.st.com/stonline/books/pdf/docs/4347.pdf
http://perso.wanadoo.fr/transmic/fichiers/cdi4347.pdf
http://ourworld.compuserve.com/homepages/JET_AV8R/Vision/Ignition/CDI.HTML
Click to expand...
Thanks, Dave -- good stuff.

--
Mike "Rocket J Squirrel" Elliott
71 VW Type 2 -- the Wonderbus (AKA the Saunabus in summer)
KG6RCR
 
On Sun, 11 Apr 2004 15:41:58 -0700, "Mike Rocket J. Squirrel Elliott"
<j.michael.elliottAT@REMOVETHEOBVIOUSadelphiaDOT.net> wrote:

Jim Thompson wrote:

On Fri, 09 Apr 2004 17:35:52 -0700, "Mike Rocket J. Squirrel Elliott"
j.michael.elliottAT@REMOVETHEOBVIOUSadelphiaDOT.net> wrote:


Schematics, DIY articles and/or kits, "How they work" articles for CDI
systems. Need a primer and some discussions of working examples.


See "CD-Ignition-Basic.pdf" on the S.E.D/Schematic Page of my website.

This represents the fundamentals of an ignition system I designed for
Ford in the early '70's, but they fretted over its cost

Cost must be in the current-sense part, because one BJT, one coil, one
cap and three diodes is pretty minimal. Thanks for the post, Jim.

[snip]
Click to expand...

Car companies fret over $1.50 :-(

(The BJT does have to have a BVCEO >> 350V, resulting in lousy beta
back in those days. Today there's probably a power MOSFET that will
do the job nicely.)

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
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