SOHC.co.uk Forums > CB500/550
Ignition dilemma
Bryanj:
No Bitsa, as you well know after a 13 hour night shift my keyboard is dyslexic
Bitsa (Ralph Wright - RIP):
;D ;D ;D
Bitsa
SteveD CB500K0:
--- Quote from: Trigger on January 26, 2015, 10:30:19 PM ---
Is this the statement that Hondaman wrote ;D
--- End quote ---
Can't be.
The whole point about high performance coils is that they offer a lower impedence and hence generate a higher current when active. The voltage in the secondary (HT leads in this case) is a function of the rate of change of the current (not the level of current itself).
When the points open, the current in the coils falls at a huge rate (1000's of Amps per second) and the large HT voltage is generated in the secondary.
Cutting the current back down to standard won't give you a fatter spark unless the secondary has more copper turns.
When the points are closed, the higher current flows through the coil. It doesn't generate anything at that stage - just burns power!
Steve (BSc Eng University of Sussex 1976-79)
I could do the differential calculus back then...
Nurse Julie:
Oh my goodness. Electrics in the human body are soooooooo much simpler. Either they work or they don't !!!
Julie
MSc BSc(Hons) RGN
AshimotoK0:
One day I am going to reproduce a modern version of the CDI I designed and made for my original 400/4 back in 1978 (whacked the standard coils with 400VDC switched by a thyristor from a capacitor (the cappy was a spare from my Pye valve colour TV at the time!). Retained original points (Honda Genuine) never needed re-timing and did 22k miles before I sold it. Bike was last taxed in 2013 .... wonder if my CDI system is still fitted ... XDN128R. During initial testing the bike backfired and almost blew my garage door off.
Ash
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