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24 Feb 2011, 22:29 (Ref:2836434)
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#1 | |
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Registered User
Rookie
Join Date: Feb 2011
Posts: 8
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CDI retard switch
Many old F1 cars with Lucas CDI ignition which had fixed timing had a retard switch to back the timing off to allow easier starting. Just wondering how this switch is wired in and how it actually retards the timing?
Appreciate any comments |
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24 Feb 2011, 22:54 (Ref:2836452)
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#2 | ||
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Veteran
Join Date: Sep 2003
Posts: 1,074
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This http://www.jetav8r.com/Vision/Igniti...cdidiagram.gif is alleged to be a sketch of a CDI system. Alleged, because my Danish isn't up to checking what is says.
AJ6 Engineering published a book that includes chapters on CDI: http://www.jagweb.com/aj6eng/misc_bits.php CDI seems to be popular for mbikes nowadays - try posting on a biker forum? John |
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24 Feb 2011, 23:01 (Ref:2836456)
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#3 | ||
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Veteran
Join Date: Nov 2006
Posts: 9,419
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It must switch to a sensor after the one used to run it .
I used to run fixed timing and that's all I did to start it |
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__________________
Balls of steel (knob of butter) They're Asking For Larkins. ( Proper beer) not you're Eurofizz crap. Hace más calor en España. Me han conocido a hablar un montón cojones! Send any cheques and cash to PO box 1 Lagos Nigeria Africa !
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25 Feb 2011, 09:37 (Ref:2836619)
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#4 | ||
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Registered User
Rookie
Join Date: Feb 2011
Posts: 8
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CDI retard switch
Quote:
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6 Mar 2011, 18:44 (Ref:2841101)
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#5 | ||
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Racer
Join Date: Nov 2009
Posts: 202
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You put 2 sensors on the crank (or wherever your toothed wheel is) and the 2nd sensor is postioned so the teeth pass over it just after the sensor used for the ECU.
You then have a switch setup to allow you to switch to your 2nd sensor. Has the effect of retarding the timing, and you can switch it back to your normal sensor (and therefor timing) once you've done the cold start. |
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8 Mar 2011, 14:03 (Ref:2842131)
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#6 | ||
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Veteran
Join Date: Aug 2004
Posts: 14,699
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MSD do a kit for this.
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__________________
You can't polish a turd but you sure can sprinkle it with glitter!
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9 Mar 2011, 05:53 (Ref:2842490)
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#7 | ||
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Registered User
Rookie
Join Date: Feb 2011
Posts: 8
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Quote:
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9 Mar 2011, 10:16 (Ref:2842603)
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#8 | ||
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Veteran
Join Date: Aug 2004
Posts: 14,699
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Couldnt you have a big lever on the steering wheel attached to the dizzy or magneto that advances and retards as required, opps sorry this has already been done about a 100 years ago!
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__________________
You can't polish a turd but you sure can sprinkle it with glitter!
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9 Mar 2011, 12:58 (Ref:2842689)
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#9 | ||
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Racer
Join Date: Feb 2005
Posts: 162
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On the Lucas CD system, the retard pin is typically connected to the starter solenoid. When you activate the starter, 12V is applied to the CDI pin and the ignition is retarded whilst you are cranking.
If you PM me with your email, I can send you a copy of the wiring diagram. Ian |
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