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Electronic Ignition Question


 
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white halftrack
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Joined: 20 May 2011
Posts: 321


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PostPosted: Fri Oct 12, 2012 4:55 am    Post subject: Electronic Ignition Question Reply to specific post Reply with quote

I have an electronic conversion on an tractor that I would like to
switch over to a runner. I do now know much about them and
would like to have some idea of what I am doing before I go out and
fry myself up some electronics.

The facts.
EI tractor runs really well.
Is 12 volt.
There is a resistor mounted right by the coil.

I presume.
The reisistor means that the coil is 6volt.
I can just switch resistor forward to the receiving tractor as it was
12 volt also, but points.

From what I gleaned in the archives, if I get a different 12 volt coil, I
would not need the resistor? I could not understand that as I
thought that would still give too much volts or ohms or jules or
stuff to the EI distributor and fry it.

Thanks again.
Jason
 
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JMOR
Tractor Guru


Joined: 13 Aug 2007
Posts: 14982


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PostPosted: Fri Oct 12, 2012 5:15 am    Post subject: Re: Electronic Ignition Question Reply to specific post Reply with quote

White Halftrack wrote:
(quoted from post at 08:55:52 10/12/12) I have an electronic conversion on an tractor that I would like to
switch over to a runner. I do now know much about them and
would like to have some idea of what I am doing before I go out and
fry myself up some electronics.

The facts.
EI tractor runs really well.
Is 12 volt.
There is a resistor mounted right by the coil.

I presume.
The reisistor means that the coil is 6volt.
I can just switch resistor forward to the receiving tractor as it was
12 volt also, but points.

From what I gleaned in the archives, if I get a different 12 volt coil, I
would not need the resistor? I could not understand that as I
thought that would still give too much volts or ohms or jules or
stuff to the EI distributor and fry it.

Thanks again.
Jason
Always safest to contact the mfgr of the EI module, but........it is probably Pertronix or Genesee (same part) & the mfgr specifies a coil plus resistor (total resistance) to be a minimum of 3 Ohms. Sounds like your coil is less than 3 & needs the resistor added to bring it up to 3 total. Yes, if you get a coil with at least 3 Ohms, you can skip the resistor. IC14SB is one such coil.
 
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Texasmark1
Tractor Expert


Joined: 22 Nov 2011
Posts: 2908


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PostPosted: Fri Oct 12, 2012 5:34 am    Post subject: Re: Electronic Ignition Question Reply to specific post Reply with quote

Agree.

The silicon device that dumps the storage capacitor to initiate
the spark can only handle so much current and heat is a
consideration. Not really a big deal when you think about
regular ignition points.......installing a current limiting resistance.

My MF manual says that regular mechanical ignition points are
rated for 5 amps max which, when you do as Mr. JMOR said will
put you right there....14.5v alternator/generator output at PTO
rpm divided by 5 amperes is right at 3 ohms of series resistance
required.

Mark
 
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