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Farmall & IHC Tractors Discussion Forum
Show Parts for Model:

transistor ignition

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karl f

02-09-2013 19:08:12
172.163.26.164



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Saw mention of the Delco transistor ignition option in my 656 I&T manual. I don't remember mention of it in the operators manual. I was wondering about its lack of popularity and googled it. Seems moisture intrusion and heat were detrimental to it when used in the GM cars from the factory. Heat and water are 2 things a tractor gets a lot of--so likely even more problematic than in a car! also the germanium transistors used were not as good as today's electronic components.
This is not HEI, but an earlier attempt at high voltage ignition. It was stock in some cars around 64-70. Has anyone been around a tractor with the Delco transistor ignition? How long til it got thrown in the junk and replaced by a regular points distributor?

-karl f

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karl f

02-10-2013 14:11:39
172.129.63.66



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 Re: transistor ignition in reply to karl f, 02-09-2013 19:08:12  
link about the delco system as used in cars:http://www.camaros.org/trans_ign.shtml
karl f



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pete 23

02-10-2013 12:06:20
74.47.40.242



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 Re: transistor ignition in reply to karl f, 02-09-2013 19:08:12  
That is the unit I installed on a 656. No electronics in the distributor itself, still used points. Only one I have ever seen for that matter.



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karl f

02-10-2013 13:54:16
172.129.63.66



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 Re: transistor ignition in reply to pete 23, 02-10-2013 12:06:20  
thanks for the conversation, pete.
it's neat to see what was state of the art but never caught on. Now electronic ignition is popular.
i also found a link to a build your own transistor ignition project if anyone is brave--it's much simpler than the amplifier system you installed and uses the original points as a trigger. http://www.cs.berkeley.edu/~wkahan/TransIgn.pdf
then again, pertronix has a warranty and could compensate for a worn distributor cam.
karl f

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pete 23

02-09-2013 19:39:23
74.47.40.242



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 Re: transistor ignition in reply to karl f, 02-09-2013 19:08:12  
The only factory electronic ignition I am familiar with on IH gasoline tractors is a package IH offered. I installed one of them on a 656. It still used the original distributor and the points. It had a transistorized module and I don't even remember now if it used original ign coil or different one. It worked well as far as the points lasted forever as they carried such a tiny amount of current but I don't remember that it improved engine performace all that much. It did last though as it was still on tractor last time I saw it just a few years ago.

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karl f

02-09-2013 20:52:48
172.129.63.66



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 Re: transistor ignition in reply to pete 23, 02-09-2013 19:39:23  
I found IH evidence for it in the CIH parts diagrams for the C-291 and C-200 engine. take a look then google Delcotronic and see what makes it tick...
although it wouldn't be for the 656 if only available on 291

karl f



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karl f

02-10-2013 14:17:21
172.129.63.66



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 Re: transistor ignition in reply to karl f, 02-09-2013 20:52:48  

images courtesy of Messicks and CIH...



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