SOHC.co.uk Forums > CB500/550
Electronic ignition
Oddjob:
--- Quote from: K2-K6 on January 18, 2022, 05:45:18 PM ---"Does the Hondaman kit utilise the original capacitors? If so then the buyer could be in for some unforeseen additional costs if his condensers are fooled."
As I understand it, no his system doesn't use them. He leaves them in place but disconnected such that IF his electronics were to fail, then you can hook them back in circuit at roadside in reverting to straight points ignition to not leave you stranded.
Essentially the switching transistor takes all of the load itself with no need of condenser to mitigate. The "fault" side of the points that the condensers are there to control doesn't go away (as are most things in physics) it just comes out as heat from that transistor which has to be adequately dispersed to avoid failure of that component. Two different sides of a square in carrying out the same task effectively.
--- End quote ---
Not 100% sure but I seem to recall Mark saying the condensers were left in circuit so that reverting to the points was just a matter of disconnecting the module and restoring the blue/yellow connectors to the original positions. Might be wrong though. If not, then your going to need a toolkit to revert by the roadside.
deltarider:
--- Quote from: K2-K6 on January 18, 2022, 05:45:18 PM ---Essentially the switching transistor takes all of the load itself with no need of condenser to mitigate. The "fault" side of the points that the condensers are there to control doesn't go away (as are most things in physics) it just comes out as heat from that transistor which has to be adequately dispersed to avoid failure of that component. Two different sides of a square in carrying out the same task effectively.
--- End quote ---
I am not sure, I can share your view. First of all, the 'heat' at the back of the power transistor is hardly there. I mean, I can practically hold my finger there. The condenser is there to dampen possible 'hesitation' of the breakerpoints in their opening and closing and so prevent the transistors interpreting all of these 'hesitations' as switch moments. it would result in multiple switching by the power transistor, which in its turn would produce erratic sparking, that is: if there would be anything left to spark from...
The condenser is there to make sure the transistors receive one - and only one - clear signal.
royhall:
All of this is a very interesting project, but aren't you just reinventing the wheel. There are many systems already out there that do this job reliably and only need 30 minutes to fit. I have had EI on every bike I have owned for years and never had a breakdown. On some of the bikes, EI was fitted after the points system left me stranded. Don't shoot me down just saying.
deltarider:
Back then, I had no choice than to make my own. All products that I had seen (Piranha, etc) were not to my liking. For my travels I wanted something robust with a guaranteed simple back up, other than eventually having to apply for a new black box in farawaygistan and then possibly having to wait days for the thing to arrive. In particular I didn't like the positioning of the electronics. Mine are high and dry - I can cross a stream with it - and they see no higher temperature than ambient. They are shielded against vibrations and moisture. And there's the joy of making the thing yourself ofcourse. :D
AshimotoK0:
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