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CUB points
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Posted by Wess C on February 04, 2007 at 11:10:42 from (68.228.137.249):
On a 1948 CUB with original 6 volt positive ground I cleaned and set the point to .20 and disconnected the condenser , separated the wire from the points to the coil and installed a TIP3055 npn transistor (276-2020) and one diode and guess what....instead of 4.6 amps at the points now its only 70 ma (.07)amps the points go to the base , emitter to the coil , and the collector to the positive ground ,diode is 6 amp 50 volt (276-1661) between the collector and the emitter band towards the collector . The fire is a lot hotter ,so I Doubled the spark gap from .23 to .45 and the points are still at .07 amps .There is no spark or arc visible at the points , the only wear would be at the wiper or spring in about 15 years . I just have it hanging there on a pease of aluminum now but it will bolt down with a small heat sink(276-1368)in place of the condenser under the cap. not bad for under $6.00
A LED could be added between the emitter and collector with a 100 ohm resister that would light to indicate the open points which is when the spark occurs . This may be handy for adjusting timing however it is not needed and if you don't move the distributor the timing shouldn't change if the point gap is correct.
This is not true breakerless electronic ignition , more like a electronic switch that takes the high current off the points contacts , if a good lube is used un the wiper, and just a touch where the spring attaches who knows how long they would last.
Numbers in parenthesis are Radio Shack catalog numbers.
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