Right Hand Ignition Coil Replacement.

[Sesman]

I wouldn’t do yourself down. It’s very challenging to provide an accurate and complete explanation to a very wide audience. Some attempts are deemed to be over simplified by some, patronising to others and not dumbed down enough for others to convince themselves they understand the topic without it being damaging to their egos.

Believe me, there are far better explanations on’t tinder web….

[McCabe-Thiele (Ted)]

I always liked the old saying about specialising in any one area of knowledge. You get to learn more and more about less and less of any one subject area.
Eventually you reach the dizzy height of Expert  - you know everything about nothing. 😁😁😁

[K2-K6]

Back in the 1960's early Minis were negative earth I think it was so when upgrading to fit an alternator you had to change to positive earth as most car alternators were like that. Also you would switch the coil wire at the same time.

The debate back then was to do with the spark starting at the spark plug centre electrode and jumping across to to the outer contact.
The argument was that if you did not switch the coil polarity the spark would start at the outside plug contact and jump inwards affecting the ignition burn. It might have been the other way around I forget.

The direction of current flow in terms of electron flow was the reason iirc it is negative to positive. In reality most people did not bother they were more concerned about the Radio wires needing reversing!

On these bike coils with paired plug output, one plug is run inverted to the other for each coil, so both example exist here. Shouldn't really matter which way they are connected, unless something else is noted.

If you compare the two plugs from each coil after longer term use you'd see opposed "wear" pattern resulting from this.

[McCabe-Thiele (Ted)]

I thought the outputs on the coils were just Siamesed so as to speak -  gawd it's complicated ain't it.

[Bryanj]

Ted, the ht winding of the coil has two ends, on a single outlet (car one end comes out as ht cable other goes to ground. On  bike twin outlet both ends come out as ht cables.
The reason for swopping car coil input leads was something to do with this as if left the overheated, and it was eary that was pos earth everything now is neg earth

[K2-K6]

Yes Ted, as Bryan notes with the coils.

The bit I find most amusing is that Honda's 1960's points system, by utilising two double ended coils, completely eliminated the distributor, it's cap and rotor arm etc, which the motor manufacturer's never picked up on. It's a very simple shift in interpretation,  easily achieved.

It would be easy on any ohc car design with advance mech, and maybe even things like pushrod motors as the cam nose would have facilitated this if needed.

[Sesman]

Yes Ted, as Bryan notes with the coils.

The bit I find most amusing is that Honda's 1960's points system, by utilising two double ended coils, completely eliminated the distributor, it's cap and rotor arm etc, which the motor manufacturer's never picked up on. It's a very simple shift in interpretation,  easily achieved.

It would be easy on any ohc car design with advance mech, and maybe even things like pushrod motors as the cam nose would have facilitated this if needed.

FM