SOHC.co.uk Forums > CB500/550
Electronic ignition
Sesman:
Oh. I believe those hyper power drag engines employ magneto’s. Also very popular in aero circles too. ;)
K2-K6:
--- Quote from: Sesman on January 26, 2022, 02:00:39 PM ---Oh. I believe those hyper power drag engines employ magneto’s. Also very popular in aero circles too. ;)
--- End quote ---
Different reasons I feel. Aero was ordinarily mag, ultimately for reliability (useful attribute when your motor is in the sky) but Merlin for example is 4 valve. Many use multi plugs to spread the flame front over a wider piston as I understand it, and so not so dependent on "herding" all the available stratified charge past the burn nucleus.
Drag motors etc are running very specific range of fuelling and fuels that lay outside general use. Also with two seperate mag and plugs duplicated on many to avoid full combustion failure. It's combustion failing to go or complete in this sphere that elevates the risk hugely. Normally the "burn" starts and travels through to complete if possible. Failure to complete leaves unwanted fuel sacrificial to detonation (uncontrolled and staccato explosion, rather than controlled burn ) that usually takes the cylinder with it in extremes.
K2-K6:
Certainly I find this whole topic fascinating.
But more than anything, the engineers that did the original research and design of all these machines, I'm in awe of.
There's been some very clever people within these teams, trying to understand exactly what they did is intriguing.
Sesman:
Yes, indeed. All very entertaining and informative.
AshimotoK0:
--- Quote from: K2-K6 on January 26, 2022, 02:50:58 PM ---Certainly I find this whole topic fascinating.
But more than anything, the engineers that did the original research and design of all these machines, I'm in awe of.
There's been some very clever people within these teams, trying to understand exactly what they did is intriguing.
--- End quote ---
Yes .. some clever stuff in the old faulty Mk3 Boyer-Bransden black box (thanks JohnW :) ) that I am just de-potting (with difficulty) I was expecting to find a power transistor for each coil but no, just one big TO3 metal case device (sadly with no markings) .... Will report fully in Anoraks Corner in due course, when I have fully de-potted it and drawn out the circuit on CAD. No relay inside by the way and no chips just discrete components.
Oh sh*t Cathy just came in early and I have it boiling away in a pan on the kitchen hob :-[ :-[ :-[
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