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Spark Plug Jumpers

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John

11-07-2001 06:29:29




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I was told by an old timer that a common way to increase spark intensity on the old Ford A's and T's was to jump the spark through a piece of leather before it got to the spark plug. I have experienced this principal on the 2 cylinder Deere's when a tractor was running on one cylinder. By taking the wire slightly out of the magneto or distributor on the side that was not firing, and letting the spark jump to the wire, the cylinder would start firing. My question is: Does anyone know of any device that can be placed between the wire and magneto or wire and plug that will cause the spark to "jump" and give the hotter spark? Would a bakelite or plastic screw on end to replace the metal end on the plugs work? Also, by doing this, is the coil damaged? Thanks in advance.

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Clooney

11-07-2001 11:41:00




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 Re: Spark Plug Jumpers in reply to John, 11-07-2001 06:29:29  
John, there used to be little air gap devices that went either in the plug wire or snapped on the plug between the plug & wire called "spark intensifiers" they were sold by auto parts stores & other automotive places. All they were was an air gap in the plug wire. At one time Champion made & sold internal air gap plugs, I believe some are still around I "think" they had the letter U in the plug number to signify an internal gap. On some tractors, mostly M & 40s I have trimmed a little (.020-.030") from the rotor side contact to increase the gap & force the KV higher before it jumps the plug gap. A little extra gap won't hurt the coil as long as it doesn't force the spark to jump between the coil windings, or coil body & ground, & doesn't overheat the coil. Even a higher output coil won�t help the firing voltage unless there is a wider plug gap or other reason for the spark to build to a higher KV before jumping the gap. If you go to far with the plug (system) gap, coil damage, wire arcing or crossfiring in the cap can occur. Plastic & leather in the spark stream doesn't do anything an air gap won't, it just raises the voltage of the spark before it jumps the plug gap & in short time will carbon track & the spark will just follow the carbon track & not have the original resistance you tried to install in the system. If you think your spark is weak & causing you a problem you might have a bad coil & defective or wrong condenser as the condenser has a big effect on spark intensity & point life.

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burns

11-07-2001 09:45:01




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 Re: Spark Plug Jumpers in reply to John, 11-07-2001 06:29:29  
Two spark plug washers



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Chuck

11-07-2001 09:37:14




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 Re: Spark Plug Jumpers in reply to John, 11-07-2001 06:29:29  
not a good ideal will burn out the coil. Be best to have mag rebuilt for more firepower.



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Lon

11-07-2001 07:34:23




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 Re: Spark Plug Jumpers in reply to John, 11-07-2001 06:29:29  
John, according to the Robert's Carb Repair videos, making the spark jump across a gap for a longer period of time will make the windings in the mag overheat and fail.



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