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Pertronix Ignition Install Question

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stevenforehand
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Pertronix Ignition Install Question

Postby stevenforehand » Wed Apr 19, 2017 6:16 pm

hi Guys

Seems I keep digging a deeper hole for myself on this 1949 cub.

So it currently has a 12v conversion but has a magneto with a new coil. I bought I Pertronix Ignitor kit. However, will this kit work with the magneto or do I need to convert to a distributor? If so, any good step-by-step on how to do that?

Thanks!

Steven

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Glen
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Re: Pertronix Ignition Install Question

Postby Glen » Wed Apr 19, 2017 6:30 pm

Hi,
I read on here recently that they said the Pertronix ignition does not work in a magneto.
They said it works in a Battery Ignition Unit.
You could do some searching at the top of the page. :)

staninlowerAL
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Re: Pertronix Ignition Install Question

Postby staninlowerAL » Wed Apr 19, 2017 7:24 pm

stevenforehand wrote:hi Guys
Seems I keep digging a deeper hole for myself on this 1949 cub.
So it currently has a 12v conversion but has a magneto with a new coil. I bought I Pertronix Ignitor kit. However, will this kit work with the magneto or do I need to convert to a distributor? If so, any good step-by-step on how to do that?
Thanks! Steven

Confused on the description. 12v conversion, does this mean that you are using an external 12v coil or are you using 12v for starting and still have a OEM magneto with internal coil? It might not matter since the Pertronix ignition might not fit inside the magneto housing. If you convert to battery/distributor ignition just be sure you get ALL the parts. The mag mounts differently from the way a distributor mounts to the block.
Stan in LA (lower AL)
USAF & Reserves, Reg ARMY, ARMY NG (AL)

stevenforehand
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Re: Pertronix Ignition Install Question

Postby stevenforehand » Wed Apr 19, 2017 7:28 pm

Hey guys

Sorry I wasnt clear. The current system has a magneto with the wire clipped and external coil installed. So if I bought something like this: http://www.ebay.com/itm/252852723471, it seems it includes all I need to replace the magneto with a distributor?

staninlowerAL
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Tractors Owned: Cubs: (3)'49's, (1 is for parts), (1)'57 IH Cub LoBoy w/FH, (2)154 Number Series Loboys, (1 is for parts), '76 Longstripe w/FH, Mowers: C-22, Bush Hog 412, Pennington 59, Woods RM42CF, Woods 42, assorted FCub plows, planters, discs, etc. OTHERS: '49 AC B & Ind. Sickle mower, '61 AC D12 Ser 2, '52 8N, '56 Ferguson 35 Deluxe, '47 & '49 Avery V, '53 MM BG (offset), '51 JD M (regular), '56 JD 420C, with Blade and fire plow, '85 JD 850 (Yanmar) w/72" belly mower, '76? Yanmar 2TR15 1500 & Bush Hog SQ42S-2 mower, '78? FORD Dexta, '86 FORD LGT14D & 48" Mower, (2)Cub Cadets & Mowers (MTD), (4) Sears Surburban's, other MTD mowers, Jeeps & other misc. "treasures"
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Re: Pertronix Ignition Install Question

Postby staninlowerAL » Wed Apr 19, 2017 7:35 pm

Someone posted that Pertronix systems are available for 6v and 12v, the question is will it work in a magneto housing. That question is best left to someone who has done it or to the mfg tech support. Sorry for the lack of knowledge. Stan
EDIT: Curious why you want to change to Pertronix ignition. Are you having ignition issues? There are many Cubs out there that are running satisfactorily with the setup that you have.
EDIT 2: From GSS 1012 shows what's needed and a distributor minus the cap:
FROM GSS1012.JPG
Last edited by staninlowerAL on Wed Apr 19, 2017 7:54 pm, edited 1 time in total.
Stan in LA (lower AL)
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Re: Pertronix Ignition Install Question

Postby John *.?-!.* cub owner » Wed Apr 19, 2017 7:47 pm

I have never tried that myself, nor do I know of anyone who has, but I see no reason it would not work with the external coil being used. One thing to think about though, is that a magneto is at TDC or 13 degrees advanced with no in between while a distributor progressively advances as rpm are increased until it reaches 16 degrees advanced. This would not keep it from working, but you would not gain some of the benefits gained from the proportional advance.
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Re: Pertronix Ignition Install Question

Postby Glen » Wed Apr 19, 2017 7:54 pm

Hi,
The Battery Ignition Unit uses a special stud to hold it to the engine at the top hole. The stud screws into the engine, and is a smaller size where it goes through the hole in the Battery Ignition Unit. Here are pages from the Cub parts manual showing it. It is number 18 in the pic.
It is the 2nd number 18 on the 2nd page.
Below is a picture from TM Tractor showing the stud in the top hole.

Below is a post from February about this topic, read what Gary says at the last post on the page. :)

http://www.farmallcub.info/manuals/cub_ ... 012-07.jpg

http://www.farmallcub.info/manuals/cub_ ... 012-08.jpg

viewtopic.php?f=1&t=95826
Attachments
Cub block 4.jpg
Last edited by Glen on Thu Apr 20, 2017 4:55 pm, edited 1 time in total.

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Re: Pertronix Ignition Install Question

Postby inairam » Wed Apr 19, 2017 8:33 pm

I think the issue will be you not be able to get the wires out to the coil the same way as with the distributor. it may be easier and a cleaner install if you get a distributor and as John said get more of the benefit of the conversion
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Re: Pertronix Ignition Install Question

Postby Gary Dotson » Thu Apr 20, 2017 8:32 am

The Pertronix will not work in the mag housing for several reasons. 1. it won't mount in there. 2. There would be no place to mount the rotating magnet. 3. The point cam, in the mag, spins at double speed, verses the dist. 4. Other reasons I haven't wasted my time thinking about. It just plain won't work!

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John *.?-!.* cub owner
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Re: Pertronix Ignition Install Question

Postby John *.?-!.* cub owner » Thu Apr 20, 2017 10:18 am

I had not thought about the shaft speed till Gary posted, but he has that pegged. The shaft operating the points spins twice as fast on a mag as it does on a distributor and there is a gear on the end to slow the rotation down for the rotor. Which if I recall correctly (happens occasionally) also means the shaft of a mag only has 2 flat spots where the points ride rather than 4 as the distributor does.
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Re: Pertronix Ignition Install Question

Postby Buzzard Wing » Fri Apr 21, 2017 7:49 am

A mag IS the ignition system. A distributor is a DIFFERENT type ignition system. The battery (and charging system) will only be for the starter and lights in a mag system. You can run a Cub with only a mag, start is with crank. No charging system or starter or lights.
1971 Cub (Rufus) 1950 Cub (Cathy) 1965 Lo Boy Fast Hitch (Nameless III) 1970 Cub 1000 Loader & Fast Hitch (Lee)


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