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Magnetos, Ignition Coils and Spark Plugs Discussion about magnetos, buzz coils, spark plugs, ignitors and low tension coils.

Magnetos, Ignition Coils and Spark Plugs

Fairbanks Morse Z 3hp AB33 windings


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  #21  
Old 08-14-2017, 07:26:31 AM
DunlopBob DunlopBob is offline
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Default Re: Fairbanks Morse Z 3hp AB33 windings

Thanks Joder for the links and the info, most helpfull
cheers Robbie

---------- Post added at 12:26:31 PM ---------- Previous post was at 12:19:30 PM ----------

Quote:
Originally Posted by brownfrog View Post
Hello Robbie:
Been there done that. The last AB33 we rewound was done with 12,000 turns of #40 on the secondary and 170 turns of #21 on the primary. Bad windings can be annoying. Also check the condenser lurking in the base of the armature for electrical leakage. Most found are bad. They will be in the .16-.2 Microfarad range. Polish and set the points for certain, make sure that the pivot freely. the steel pivot pin can grow rust and cause the points to float. When you disassemble,leave the two magnets fastened to the endcap and slide the whole assembly back as a unit.
Hi just a quick question, the key of my points plate is missing / broken off so trying to line up by eye, so when the mag is at rest should the fibre brush be contacting the ramp enough to hold the points open so they are only closed when the mag is being cocked then blipped open on the recoil? or closed at all times except when the mag flicks? Just a wee bit more learning required for my understanding of magnetos.
Thanks again Robbie
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  #22  
Old 08-14-2017, 01:45:13 PM
brownfrog brownfrog is offline
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Default Re: Fairbanks Morse Z 3hp AB33 windings

Hello Robbie:
That is our AWG designation. I think that originally it was made with #41 but we like to use #40 when we can. we use Mylar film .001"thick betweeb layers,then vacuum dip and bake with a heat cure epoxy. We dip and bake for 3 cycles to get a build on the outside. Be sure and check the condenser (Capacitor). most found are bad. Another upgrade is to replace the wimpy magbets. replace the megnet plates on the sides with 1/8" steel plate the same size, then place a domino sized ceramic magnet between the 1/8" plate and the magneto housing/poleshoe. We did this years past when we rebuilt the maggie on our 1 1/2Hp Fairbanks Morse light plant.

Be careful pulling the collector spool off. Do not pry or it will break.Don't ask me how I know that. Make a puller by boring a hole in a square piece of plate the width of the brass ring with the bored hole the size the of the ring diameter ro make a clamp to grab the ring, Next drill bolt holes on two sides of the plate, then saw in half. Now you can clamp onto the brass ring and get a hold of it with a bar puller. Time making a clamp os time well spent.

We use an actual coil winding lathe made in Switzerland and all is well but anything that will advance the lateral feed one wire width per revolution will work.

The screws holding the armature ends are metric despite being made in America. use an impact driver if they do not come easily.
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  #23  
Old 08-14-2017, 05:35:23 PM
DunlopBob DunlopBob is offline
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Default Re: Fairbanks Morse Z 3hp AB33 windings

Thanks again Brownfrog,
I have been searching for this information for some time only finding small pieces from time to time, now thanks to you I have it all in one go, this is fantastic now the long slog of winding has no reason not to start ( gulp ) !
Thanks Robbie
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  #24  
Old 08-17-2017, 07:35:41 PM
DunlopBob DunlopBob is offline
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Smile Re: Fairbanks Morse Z 3hp AB33 windings

Hi again folks, anyone know where you can get points for the ab33 magneto?
Cheers Robbie
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  #25  
Old 08-17-2017, 11:32:34 PM
joder joder is offline
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Default Re: Fairbanks Morse Z 3hp AB33 windings

If you can't find an easy source, read deep into the britbike article - it talks about using a certain composition TIG electrode to replace the points in your existing rotor.
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  #26  
Old 09-04-2017, 07:47:40 AM
DunlopBob DunlopBob is offline
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Smile Re: Fairbanks Morse Z 3hp AB33 windings

Have discovered my coil is ok if you check continuity between collector ring and ground you will most often get open circiut as the ht wire from the secondary coil is just pushed into the ring. I checked ground to this wire just before it enters the collector ant it's ok. Great, but needed to change condensor (am going to post pics of how this was done as the condensor I replaced looked nothing like the pictures you normally see and it was quite easy ) however am now getting points problems with the mica insulation under the fixed point breaking down giving a short and no spark. when it does spark I can get at least 1/4 inch spark so maybe light at the end of the tunnel. Fingers crossed Robbie
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  #27  
Old 09-07-2017, 06:11:42 AM
DunlopBob DunlopBob is offline
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Angry Re: Fairbanks Morse Z 3hp AB33 windings

Hi folks, still having trouble ith this ab33, had a dead short when the points plate is bolted on traced this to the insulation beneath the condenser ( when the bolt was tightened the condenser base was piercing said insulation ) fixed this with a thin plastic shim. Now I get a big spark when turning the engine, however this soon becomes a thin weedy spark which sometimes looks like a collection of sparks or multiple sparks which are uncapable of firing the engine. I have a very large points gap as the points are so worn I have run out of adjustment could it be this or a very weak magnet? ( someone has converted this mag to take a horseshoe magnet and I wonder how much of a problem this is. Any help or comments would be great cheers Robbie

---------- Post added at 11:11:42 AM ---------- Previous post was at 11:10:12 AM ----------

Also you may have heard of an elephant gun, but have you ever heard of an ab33 gun?
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