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Farmall & IHC Tractors Discussion Forum
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Farmall 450 LP Coil

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Albert Pereira

08-26-2007 12:37:06




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Hello, Well cleaned the plugs one was really fauled but tractor still wont start. I'm thinking not a hot enough spark. If I run a hotter plug like the 388 and a Flame thrower type Coil 45,000+ volts should help keep the plugs clean. But will I need to install a resistor to keep the points from burning? Thanks, Albert




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CENTAUR

08-26-2007 13:47:37




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 Re: Farmall 450 LP Coil in reply to Albert Pereira, 08-26-2007 12:37:06  
It does you no good whatsoever to have a 100,000 watt coil as the plug only uses what is needed to bridge the gap which is only a few thousand volts at idle.They have all the reserve you will ever need in the original coil.CENTAUR



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Janicholson

08-26-2007 13:12:43




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 Re: Farmall 450 LP Coil in reply to Albert Pereira, 08-26-2007 12:37:06  
From my experience, a standard IH coil will provide plenty of spark. The plugs fire at what ever the gap voltage is. Thus if the gap is at .030 the spark voltage might reach 12,000 at idle, and drop to 6 or 7 thousand at full load. (more air and fuel compressed between the electrodes = easier to fire) if gapped to .040 the spark voltage might rise to 14 or 15,000 before jumping across. Excess voltage above that will not actually make it run any better. If it has higher amps running through the primary, then the flux density will be stronger, and the spark will be both more intense, and last a bit longer. The point life will be reduced, and the fact is that LP tractors fire pretty easily. I would look to the mixture, (or possible distributor shaft wear) for problems. JimN

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teddy52food

08-26-2007 18:10:54




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 Re: Farmall 450 LP Coil in reply to Janicholson, 08-26-2007 13:12:43  
Jim: this time I have to disagree with you. (more fuel and air compressed between electrodes= easier to fire.) The opposite is true. Try to gap the plugs as wide as you can in the open air to where they will still fire. Then put them in and under compression they will not fire.



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Janicholson

08-26-2007 21:30:59




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 Re: Farmall 450 LP Coil in reply to teddy52food, 08-26-2007 18:10:54  
Though it seems wrong to have idle volts higher than load volts, I have extensive operating (and training) on a sun scope attached to everything from a lawnmower, to a 57 Mercedes 300SL coupe. With the scope, one looks at the actual spark line and it is scaled in thousands of volts on the screen.
Idle voltage is always higher than load voltage. for the reason I stated. JimN



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Albert Pereira

08-26-2007 15:19:32




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 Re: Farmall 450 LP Coil in reply to Janicholson, 08-26-2007 13:12:43  
The problem is it was fouling the plugs really bad and burning lots of oil. Going to do an overhaul on it this fall but need it to work a little more before then. It already has two no fouls on it which helped. But this last time when I parked it, it wouldn't start. I pulled the plugs on it and one of the ones that dont have the no foul was fouled, I cleaned them up with a wire brush, and tried cranking it over, it fired once or twice and that was it. I dont know if I am getting enough spark energy to the plug? And I wanted to run a hotter plug to help keep the plug cleaner a little longer.

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Janicholson

08-26-2007 17:25:39




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 Re: Farmall 450 LP Coil in reply to Albert Pereira, 08-26-2007 15:19:32  
A wire brush makes a metalic deposit on the alumina of the spark plug insulator tip. It will not run with a conductor to ground. It seems like a good way to do it but it is not. New plugs, or find someone with a old fashion plug sand blaster to clean them up. JimN



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