SOHC.co.uk Forums > CB500/550
Electronic ignition
K2-K6:
He doesn't seem to be saying anything within this element (output form) that's not known about in points+condenser type ignition.
But also not discarding it in his translation to solid state switching.
The "spark form" is simply a characteristic of switching operation for condenser assisted switching, certainly it can be looked at as imperfection, but with the overiding caveat that the original combustion design, strategy and R&D was completed within that status. It therefore forms part of the whole system performance as designed. To delete it with "improved" switching has implications that are unquantified and will likely have an impact on combustion.
K2-K6:
Isn't understanding exactly what Honda designed and researched then a fundamental part of bringing a modification to their system?
Certainly it's possible, but are you just going to "luck" into it or appreciate why you are changing something and what the effects really impact.
allankelly1:
Just a question but original combustion chamber design ignition curve would have been based on leaded four star fuel. So would modern fuels affect combustion, speed heat of combustion etc as on another forum it was mentioned that adding ethanol produces a smaller bang and affects detonation (reduces it)
Or maybe I am talking rubbish and happy to be corrected
Best regards Al
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K2-K6:
Ultimately developed as a 2star runner (if that's the right way to describe it) and with zero lead ability from the off. Whether it was for unleaded or because a aluminium casting with valve seat inserts naturally evolved in material specification to cope with that, I'm unsure.
Relatively low compression ratio gives it a large, and natural, fuel quality acceptance without any significant adjustment.
Many of the characteristic of these engines are now seen in current designs, they really were very far ahead in the experience and knowledge they brought to this subject.
Using a high octane fuel in them has all but zero observable effect.
allankelly1:
Thanks K2-K6
Every day is a school day
Best regards Al
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