SOHC.co.uk Forums > CB500/550
spark plugs
Johnwebley:
I have used Boyer since the late 70s,
Set up on full advance
I have always fitted the leads as 1-4,2-3,but it does run at any fitting
Sent from my SM-A546E using Tapatalk
Morala:
thanks for all your input guys
McCabe-Thiele (Ted):
--- Quote from: Sesman on February 21, 2025, 09:38:28 AM ---Hi, Ted. I’m not an authority on the topic, but I’d imagine that without a complete induction cycle including compression there would be no risk of premature ignition. The spark is as they say…wasted.
--- End quote ---
I would expect petrol vapour to ignite if there is a spark firing whilst the piston is sucking in air through the inlet valve once the engine is hot, especially as the spark fires before TDC anyway.
Could it be that the inlet valve timing plus the spark advance mean the wasted spark fires just before induction actually starts. It's a difficult process to visualize, but if members say their Boyer system is immune to firing order then I have to accept that's the case.
On the positve side the plug leads going from the left coil to 1 & 2 will look much tidier as it is not having to cross over the middle of the frame.
Another thought, does that mean it will wear out the coils twice as quick as each coil sparks twice as often as a points based system ?. As the Boyer also does without the mechanical advancer it must be a clever box of tricks that also acts as it's own crank position sensor.
Sesman:
But it doesn’t does it Ted!
Sesman:
Regarding wear and tear, I’d imagine that the LT side is subject to magnetic forces stress and the HT side subject to insulation stress. Though I’d guess it’s all relative and both coils will experience magnetic and insulation stress to some degree. I’m basing this notion on basic power transformer theory.
So yes, if the units spark twice as much I’d expect increasing wear and tear…though whether this is detrimental to longevity is anybody’s guess.
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