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Allis Chalmers Discussion Forum
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Non-Resistor Spark Plugs--?????

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Pappy

10-28-2007 04:58:31




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For a '39 Allis Chalmers 'B', can anyone advise me on what non-resistor spark plug to use. It has a magneto. My auto parts store expert didn't have a clue. I'm not particular about brands. Thanks!!




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ohio

10-28-2007 15:27:58




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 Re: Non-Resistor Spark Plugs--????? in reply to Pappy, 10-28-2007 04:58:31  
I run autolight 86's in my mag fired allis's.



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Steve in N.J.

10-28-2007 06:09:27




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 Re: Non-Resistor Spark Plugs--????? in reply to Pappy, 10-28-2007 04:58:31  
The plug used by most AC collectors and enthusiasts is the Autolite 295 Spark Plug. Should be able to find them locally. If not we carry a boat load of em' in stock. Try to stay away from the Champions. They seem to foul real easy and are more headaches than they're worth. Another plug I've used in my B model was an NGK B6S. Tried them a couple summers back and they worked nice too. No fouling, and ran without a miss. HTH
Steve@B&B

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Pappy

10-31-2007 11:26:38




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 Re: Non-Resistor Spark Plugs--????? in reply to Steve in N.J., 10-28-2007 06:09:27  
Thanks to Steve N.J.-----I went to my local store and got the Autolite 295 spark plugs. I measured them with a meter and there is no resistor or suppressor in them. They look to be just what I have been looking for. From the apearance of the insulator, they look to be a pretty hot plug. I will try them as soon as I get back to the farm.



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John T

10-28-2007 06:04:00




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 Re: Non-Resistor Spark Plugs--????? in reply to Pappy, 10-28-2007 04:58:31  
Sorry, Im only familair with the Deere plugs HOWEVER especially when running a Magneto ignition with its limited spark energy you are EXACTLY RIGHT in wanting a NON Resistor Plug and wire core (NOT carbon core suppressor type) Plug Wires. Since youre only starting out with limited and RPM dependant energy in the first place, you sure dont want to waste any as heat in resistor plugs or resistive wire.....

John T

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ohio

10-28-2007 15:30:18




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 Re: Non-Resistor Spark Plugs--????? in reply to John T, 10-28-2007 06:04:00  
If you have a good hot mag, or someone knowlegable working on one, you won't have too limited an output! It'll sure outspark a points ignition.



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John T

10-28-2007 17:02:50




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 Re: Non-Resistor Spark Plugs--????? in reply to ohio, 10-28-2007 15:30:18  
Generally speaking, which dont apply to all mags and depends on their condition, of course, a garden variety battery powered coil ignition which has all the stored energy of a large battery to draw from (and is NOT SO RPM dependant like the mag), produces more energy then the average garden variety magneto, which first of all has to produce all its own energy (gets none from a battery) plus its RPM dependant so at low RPM its even less energy grrrrr rrr. Of course, a good hot strong mag can produce more energy then a weak coil system with a weak battery and vice versa, but Im talkin general systems here. The mag was for non battery hand crank tractors originally but has the distinct advanatge it can still work fine where a coil system with a dead batetry is dead in the water lol

take care yall

John T

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