TOPIC: NHT ignitions

I have a need to further investigate some ignition methods. The original Kettering, points/coil, is tried and true and can be counted on though the mechanical aspect does require ocassional mechanical maintenance attention.
There are then other technologies to make ignition spark happen though the actual precision needed to satisfy an engineering perfection is still rather stone age.
The two triggering methods I will look into are FIRST, The rotating magnet excited trigger coil. The coil is totally inactive until the magnet drives the coil into generating a voltage. Prime examples are the Boyer and Lucas Rita.
Second is the hall effect trigger that derives it's excitation from the associated electronics package. This is where a voltage powered semiconductor is then voltage current altered caused by a rotating magnet field as it passes close by. The electronics package then responds to the changing electric voltage/current power and it's circuitry causes the correct ignition coil response.
The vast majority of ignition coil spark generation is closely similar to a bowler. Bowler grabs a heavy ball (battery stand by). Bowler does the wind up with arm and running down the delivery lane launches the ball down the isle. The massive energy of the ball is like the electromagnetic energy field power. When the ball gets ready to impart it's energy like the ball hitting the pins down, the magnetic fields collapse to expend the energy as a spark delivered to the spark plug..

Found a nice article that I will have to investigate for using HEI modules with low ohms/inductance coils for short dwell, high energy spark. They are much more energy efficient which is a bonus. Might compete with the $400 systems for under $100. The lucas AB14 is one that is to be improved for short money such as on jag XJ 12's.

HERE IS THE LINK

AB14+ tech upgrade?

When NHT started, 1949, there were post war early K2F magnetos, eventually K2FC versions, and in the end again K2Fmagneto's too. Well here in north america in the land of commando the pre commando are largely 2nd class it seems except for "the few the proud the marines"...oh sorry jumped off track there. The pre commando are full of LUCAS magnetos. I own 4 NHT slimline(and 3 BSA A-10), so I am familiar.
20+ years in electronics and physics and full of curiosity, I am fully aware of these little "stink bombs" LOL.
I have researched and rebuilt several for my norton and BSA A-10 Twins.
I would imagine I am talking in to an echo chamber and am on my own...HELLO...hello...silence?
Any Question or comments before the funeral?

You're not necessarily talking to an echo chamber. I find these posts interesting and informative, but have little experience with electrical systems. I usually have to research things further in order to try to better understand the posts, and often don't feel that I can contribute to the threads in any meaningful manner.

FWIW, my bike currently has a Tri-Spark ignition installed.

Eric

Good question came in a email
Hi Dave,

I have a question about 12V single coil (dual output) to be used in combination with electronic ignition (such as Pazon/Boyer) for Norton Commando. I have been using single coils with 3 ohm resistance for a long time but last year I had reported a couple of failures (then measured 2.8 and 2.9 ohm) resulting in misfiring especially when the engine gets hot. Replacement of coil cured the problem.

What I read about coil resistance is that the lower 3 ohm coil will give best spark (high peak current) but can overheat your ignition and the higher 4 ohm coil (lower peak current) runs cooler but give a weaker (starting) spark. So I tend to go for the 4 ohm coil in future!? What do you recommend?

Your opining is much appreciated.

Thanks TC