SOHC.co.uk Forums > CB350/400

Right Hand Ignition Coil Replacement.

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Eldrick:
I just ordered the Eletrex one so expect me back when I am ftting it.

Multiman:

--- Quote from: Bryanj on February 02, 2023, 04:45:38 PM ---+ve connection to power in (black/white)
=ve connection to points (blue or yellow)

--- End quote ---

Does this make any difference?
In my very limited understanding, the primary is just a coil of copper wire with two ends, so how can it matter if the "signal" interrupt is going +ve or -ve.
I only ask as I've just fitted two new coils from DSS and have the wires the other way round to the above and thew motor runs ok.
Happy to be corrected though.

McCabe-Thiele (Ted):
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!

Personally I would just make sure they are both the same - I followed the coil markings - iirc I made a new mini loom to get the connections to reach in a tidy manner. Its seems a popular subject of debate.
https://physics.stackexchange.com/questions/461742/what-is-the-direction-of-the-electricity-flow-in-a-dc-circuit
.
For me its a bit like when you started to learn Chemistry - Elements were made up of just three indivisible sub-atomic particles - Electrons, Neutrons & Protons - the reality is somwhat different. I am happy with the 3 constituents for my grasp on the world never seen a quark, neutrino, positron to name but a few never mind the Higgs Boson.

Multiman:
Interesting points there Ted.
I live and learn

Johnny4428:
You know what? I have read a few posts this morning and I am feeling mucho thick. I’ll maybe read a few times yet when the “brain fog” clears.

(Some very wise and clever people on this forum)


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