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Re: triumph trw

Very droll Ian...

email (option): jeremy@clogmaker.co.uk

Re: triumph trw

Just to clarify a few points, generally speaking ignition coils of yore were large and less efficent and therefore produce heat which needed dispursing, they were othen filled with oil to help this. Then they became a bit smaller (and cheaper) in a aluminium container, although more efficent and cooler running they required some external cooling from air flow, even under bonnet temperatures were still cooler then their core temp. Modern coils are much smaller (and cheaper still) and are more efficent things but they require a heat sink so are bolted to something cool, a body panel or bike frame. All these applications are fine when new but as electrical components age they become less efficent as they decay and resistance increases resulting in great heat production to the point they become unreliable. If this wasn't the case magnetos and dynamos would go on for ever. So, to go back to your original point, if you have an old vehicle with its original coil in place and it runs fine I'm pleased for you but there were many more whose coils have been replaced or they simply don't exist anymore. If you fit an NOS coil and it works I'm also pleased but many will have decayed to the point of unservicablity. If you fit a modern oil ensure it has a good heat sink, so bolting coils to the bottom of a nice cool petrol tank even in the rain isn't such a bad idea.
Richard

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