SOHC.co.uk Forums > CB500/550
Electronic ignition
deltarider:
--- Quote from: AshimotoK0 on January 15, 2022, 11:11:12 AM ---[...] looking at the one in the kit, it looks pretty decent BUT I don't know it's voltage spec.,
--- End quote ---
The kit has a 600V one like shown in the first pic below. In mine I fitted the somewhat smaller 400V one, a MKT B32523 (blue in the second pic) as it was easier to fit size wise.
AshimotoK0:
Phil I will design & make PCB with a dual circuit on it, tracked to take either the small transistor package or the larger 'BU' one and some SMD (surface mount) parts i.e. resistors and diodes and you can have as freebie.. as my 'guinea pig' ;D ;D ;D
This is the schematic of the Pirhana ignition BTW and turns out it used BU941Z ignition transistors ;) ;) .
K2-K6:
Ash, Sparkrite were another make that switched electronically from points instigation to "convert" systems. Whether there's anything interesting in that product I'm not sure.
I've one of these on an old points distributor V8 that still works well (1980s fitment) and has a toggle switch to put the system into or out of use without changing components.
A question, one of the principal changes I can see in advantage for electronic systems is in keeping a constant "dwell" regardless of crankshaft speed, do these system still switch both up and down on points timing or hand over dwell function to electronic?
Oddjob:
Oh god, they're building a death ray now.
AshimotoK0:
--- Quote from: K2-K6 on January 16, 2022, 09:51:46 AM ---Ash, Sparkrite were another make that switched electronically from points instigation to "convert" systems. Whether there's anything interesting in that product I'm not sure.
I've one of these on an old points distributor V8 that still works well (1980s fitment) and has a toggle switch to put the system into or out of use without changing components.
A question, one of the principal changes I can see in advantage for electronic systems is in keeping a constant "dwell" regardless of crankshaft speed, do these system still switch both up and down on points timing or hand over dwell function to electronic?
--- End quote ---
On the one we are discussing here, the points are retained plus the condenser so it replicates the old 'Kettering' system really but the load is not switched by the points but a semiconductor. One thing on the ones which retain the points though is to still pass a smallish current through the points, which stops them developing a corrosive (insulating) film because of the electronic cleaning action of the tiny sparks created by the low current.
I have a capacitance discharge and inductive discharge version of the Sparkrite ignitions in my store cupboard at work (with the little toggle switch to switch back to conventional). They were intended for my MG Midget, which I sold last year. i must do a 'tear-down' as our American friends say ;D ..... There are loads of design ideas out there to create multiple spark Cdi's etc but once you introduce a micro-controller you are vastly increasing the complexity and potential for failures or 'lock-ups' in a DIY system. To be honest there is nothing wrong with the standard Honda circuit, particularly for the low mileages done on classics. But a simple circuit like Phil and Deltarider (and I presume 'Hondaman' ) are suggesting makes sense due to the high costs of OEM points & condensers.
Me I am just a geek, anorak, collector-of-shiny-parts, nerd, rivet-counter, mad-scientist, terrorist or whatever you wanna chuck at me .lol ;D ;D ;D ;D keep it coming Ken ;D ;D
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