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Post by davidr on Jul 15, 2021 13:34:01 GMT
Has anyone had any experience of fitting one to the small electronic ignition units to a Cyclemaster. These are the ones that replace the points and capacitor and connect directly to the coil. I have installed one with a single terminal and am having problems sorting the timing. The references to these units suggest that no change to the timing is needed but this is not the case with my installation. When it is fitted to an engine that is correctly timed and running on a points set up the electronic unit seems to need to be advanced quite a lot - so much so that I have had to file out the back plate slots to get anything near enough advance. I have had the engine running reasonably well with the unit but as I don't have a strobe light it involves a lot of trial and error. I am now wondering whether the problem is due to the six magnets in the Wipac 90 flywheel. How does the electronic unit know which magnet is the right one - or does it just fire six times per revolution?
Any answers/advice would be gratefully received.
Best wishes to all.
David
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Post by davwat on Jul 15, 2021 13:42:06 GMT
Has anyone had any experience of fitting one to the small electronic ignition units to a Cyclemaster. These are the ones that replace the points and capacitor and connect directly to the coil. I have installed one with a single terminal and am having problems sorting the timing. The references to these units suggest that no change to the timing is needed but this is not the case with my installation. When it is fitted to an engine that is correctly timed and running on a points set up the electronic unit seems to need to be advanced quite a lot - so much so that I have had to file out the back plate slots to get anything near enough advance. I have had the engine running reasonably well with the unit but as I don't have a strobe light it involves a lot of trial and error. I am now wondering whether the problem is due to the six magnets in the Wipac 90 flywheel. How does the electronic unit know which magnet is the right one - or does it just fire six times per revolution?
Any answers/advice would be gratefully received.
Best wishes to all.
David I think you have answered your own question, haven't tried it myself but it's been on other pages where they don't last long and it's due to the number of magnets. Think they only work on something like a lawn mower where no lighting coil is involved.
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Post by davidr on Jul 15, 2021 14:32:56 GMT
There is no lighting coil on my engine and as I said I have had it running reasonably well in the past.
David
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Post by JamesCentral on Jul 15, 2021 18:22:29 GMT
Do these coils have a 'polarity'? I've seen somewhere that, with a six-pole flywheel, the unit will fire 3 times per revolution, which implies that they fire in only one direction. If that's the case, then the timing could be 60 degrees out if the unit is the wrong 'polarity'. On the other hand, if it fires on change of magnetic flux in either direction, you'll be getting an extra spark 60 degrees in advance of the proper one.
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Post by davidr on Jul 16, 2021 8:22:28 GMT
Thanks for this - it's certainly worth a look. I've been told that the module senses the current rise within the HT coil and triggers the spark at the maximum. It did run reasonably well with the back plate fully advanced - so maybe it just needs some more advance. I'll continue tinkering.
David
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