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Post by farmrjohn on Mar 18, 2015 18:41:22 GMT -5
I've started a couple of possible projects to convert over to a dual coil ignition system, one using "junkyard" parts (Toyota reluctor & pickup, GM HEI ignition module) the other using the existing points but using a Ford TFI ignition module. I'd like to know what dual output coils folks have used, and pictures of how they are mounted. One I get more into the project I'll provide a report.
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pewe
New Member
Posts: 29
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Post by pewe on Mar 19, 2015 6:55:43 GMT -5
A problem might be, that charging times of modern coils have to be exactly and are very short. If you combine them with the standard contact breaker they might overheat in low rpm/idling.
Greetings Peter
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Post by farmrjohn on Mar 19, 2015 14:27:10 GMT -5
I will be modifying mods that have been reported for the XS/TX 650. Either mod sounds like they would be compatible with both older and newer coils. The Pamco ignition site shows mounting methods for a dual coil on a 650 and since they use the same OEM coils, I hope mounting would be similar. Since I don't have ready access to dual coils and their dimensions are somewhat challenging to find, it would be nice to see what folks have done with their 750s. My first choice is replacing the points with a Toyota sensor/reluctor and use a GM HEI module to trigger the coil. tinyurl.com/qfeqodw Unfortunately I don't have ready access to salvage yards, but did get a Toyota distributor from eBay. It had a slightly different pickup and reluctor and as a result needs to overhang part of the points plate. It looks like it will just fit in the points cavity where the existing points go, but one detail will be machining the reluctor to fit over the points cam in order to use the mechanical advance. And, there will be scant room for timing adjustment, so the reluctor will need to be place on the cam just right. I would like to find an electronic advance, that way the reluctor could just fit on the oil pump output shaft but haven't found one. My backup choice is to use the existing points, but use them as a sensor instead of the coil trigger. That is supposed to greatly reduce the electrical wear on the point, reducing the need for adjustment. This uses the Ford TFI module as the actual trigger for the coil. tinyurl.com/k3zo7ex tinyurl.com/nbeac4c There is also an add on circuit to utilize the GM HEI module, but my soldering skills aren't the greatest. tinyurl.com/3j52xhw
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