Author Topic: c10l ignition  (Read 523 times)

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Offline allen brighton

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c10l ignition
« on: June 15, 2019, 06:06:54 pm »
hi guys , I have nearly completed my c10l and I was able to re-wire it as c11, but I don't have any contact breaker assembly is there an electronic trigger assembly that I can fit instead of points , I want to retain the coil . I originaly fitted an electrex unit although it worked well I had trouble starting due  to the kick over speed , I fitted an electronic trigger to my aerial square four ---works a treat , any ideas

regards

allen

Online camman3

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Re: c10l ignition
« Reply #1 on: June 15, 2019, 06:33:51 pm »
Both the Boyer or Pazon units will fit with a bit of adaption, if the same size as c12 points plate?  :-\ ,personally I prefer the Pazon encapsulated unit.
Graham
1957 C12
In sunny (sometimes) Christchurch, Dorset, UK

Online Ginge

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Re: c10l ignition
« Reply #2 on: June 17, 2019, 10:28:17 am »
If you retain the coil then you need a DC feed so you must have a rectifier.

Take a feed from the rectifier to a capacitor in parallel with feed to coil. I think that will help with initial spark to Electrux unit.

I think....
Ginge.

Online hampshirebiker

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Re: c10l ignition
« Reply #3 on: June 17, 2019, 11:16:51 am »
I assume by capacitor you also mean condenser; as it's commonly known here.
Postal - Liphook Hants - But just into West Sussex.

Online Vreagh

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Re: c10l ignition
« Reply #4 on: June 17, 2019, 02:14:16 pm »
I think Ginge means an electrolitic capacitor somewhat langer capacity than the usual ignition condenser. It would help smooth the rough DC coming out of the rectifier.

Online hampshirebiker

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Re: c10l ignition
« Reply #5 on: June 17, 2019, 02:24:19 pm »
Thanks for the clarification. I know they perform a similar function, but there are many different ratings of capacitor. They're commonly used to store a reserve of power to assist in motor starting.
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Online timsdad

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Re: c10l ignition
« Reply #6 on: June 17, 2019, 05:34:37 pm »
When I needed a capacitor for electronic ignition I got one from Boyer so I knew it was suitable for the job.


Ray
Just a motorcyclist.

Online Ginge

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Re: c10l ignition
« Reply #7 on: June 18, 2019, 08:04:31 am »
Yes, Ginge meant the Lucas 2MC electrolytic capacitor ( 4500 microfarads or summit). 

Cheaper than building a trigger assembly and certainly cheaper and easier to find than a contact breaker assembly for a C10L. Especially if you have the Electrolux already.

Sorry about the confusion.

2MC as fitted to later big Norton/Triumph/BSA 650 twins.  Those destined to race at the weekends, with battery and lights removed for the purpose. Or 2MC as a battery back up on the Energy Transfer bikes. Higher compression engines than our C10L's and double the cylinders. The 2MC filled in the gaps.

If you have enough oomph in the alternator to nearly kickstart the bike ( or even better it will actually start...) then the capacitor will assist.  You'll have to kick the bike a few times to charge the capacitor from the alternator and rectifier.

When it has enough charge in it, it will release it to the coil which will fire.  Capacitors discharge much faster than a battery and only store briefly so it will be kick, kick, cough.  Kick, kick,cough-fire. Or something like that.

On the big twins they were wired in parallel beside the battery. Positive to positive( or ground), negative to negative.

On yours I guess it's tap into the hot feed from rectifier ( leaving original to ignition in place) and one to ground.  I'd take that ground and link it to the coil ground for maximum efficiency so your capacitor is not trying to earth to the coil through the frame.  The rectifier hot lead I presume goes to ignition switch?

Auto-electricians feel free to correct me.

Seems to me you could just zip-tie one to part of the frame, wire it in and see what happens.

Of course tiny batteries are available....and if your alternator runs the bike but just won't quite start it a tiny battery beats a capacitor any day.  Or you could do a tiny battery with capacitor in parallel....
Ginge.

Online Vreagh

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Re: c10l ignition
« Reply #8 on: June 18, 2019, 08:59:32 am »
Spot on Ginge with the wiring. Without any form of storage you have to hope that the voltage from the rectifier peaks at the same time as the points open. Not such a problem with a three phase set up but can be iffy on our old stuff. A battery holds much more reserve than a 2MC which isn't surprising when you realise that one farad supplies one volt at one amp for one second and the 2MC is measured in microfarads. But they do the job