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6 volt coils, why?

 
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debby



Joined: 15 Apr 2004
Posts: 898
Location: Boulder, CO

PostPosted: Tue Feb 08, 2005 8:05 pm    Post subject: 6 volt coils, why? Reply with quote

Something I've never understood, and have always been a bit curious about, is why Norton fitted our Commandos with 6 volt coils and a ballast resistor. The literature says it makes for easier starting with a run-down battery. But why would that be? Could someone explain that to me? Inquiring minds want to know.

Or is the truth simply that Norton had a warehouse full of old 6 volt coils to use up???

just wondering,
Debby
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fastback



Joined: 18 Jul 2004
Posts: 245
Location: Toronto, Canada

PostPosted: Tue Feb 08, 2005 8:43 pm    Post subject: Reply with quote

The explanation I received goes something like this... less is more. Higher resistance = weaker spark and Boyer its limits.

Total resistance should be around 3 -6 ohms ( for the Boyer).
6v coils are around 1.6 - 2 ohms each, 12v around 3.5 - 4 ohms each.
So, two 6v coils = 3.2 - 4 ohms, two 12v = 7 - 8 ohms. Keep the Boyer Gods happy with 6v coils.
Unless you've got that rare diesel Interpol prototype. Wink

Fstbk
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dynodave



Joined: 28 May 2003
Posts: 139
Location: USA

PostPosted: Wed Feb 09, 2005 5:01 am    Post subject: Reply with quote

Rolling Eyes
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The Unapproachable Norton Commando

At the end of 1967 the Norton Commando was announced.

The Norton Commando was greeted with a certain amount of scepticism because on first sight the commando appeared to comprise of the old Norton Dominator twin cylinder engine mounted at an inclined angle in a set of new cylinder parts.

It was not realized that the new Norton Commando Isolastic method of engine suspension damped out all engine vibration and produced a machine which had uncanny smoothness for a vertical twin. In due course the critics were silenced and the Norton Commando had the distinction of being regarded as the first of todays so called superbikes. There can be little doubt that the original design concept of the Norton Commando has proved correct, since comparatively few modifications of any real consequence have been made since production commenced during 1968.

Now nearly 40 years later Norton Commando riders like us are a breed of our own, and as far as we are concerned its still more fun to go for a blat on the old Norton Commando, and fast. As a Norton Commando owner and enthusiast, my goal here is to promote and give credit to those who keep the Norton name going.

It is more deserving to give credit to the Commando itself, for after all these years it continues to be respected. The original Commando designers like John Favill are those who deserve the credit for developing this incredible motorcycle.

The Norton Commando Roadster and Interstate of the late seventies, never died. Although the Norton Villiers factory dispersed the tradition lived on. Today Kenny Dreer in the USA is developing the new 952 CC Norton. What a great looking bike this is, and its engineering is still based on the original layout. It will be interesting to see how the new 952CC Norton does in todays tough motorcycle market. One thing is for sure, I would own one if I could afford it.