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Mornin Rob, Ive never used Splitfire plugs, especially not on any Deeres, but I wonder if or how they can improve detonation. When the voltage rises sufficient to arc jump one of its gaps (regardless if 1, 2 or 4 etc), its gonna take the path of least resistance, so I dont see what use the extra gaps could help. I guess it helps cuz that means that particular gap is least resistive and being so it reduces wasted energy and it will jump to whichever has the least resistance each time. Can you get them the correct thread size or do you have to use one of those plug thread adapters??? And are you able to match the heat ranges?? I guess my bottom line is they wont hurt anything, but unless I saw some actual dyno readings (Splitfire versus conventional plugs) I would remain somewhat skeptical. To run that 0.060 gap you mentioned, are you running an electronic ignition and a heavy duty high voltage coil????? With a stock ignition thats an awful wide gap. Widening a plug gap is no sure fire cure for any problems as it requires the coil to rise up to a higher voltage but then the arcing current (or spark duration) is less since the only energy that can be expended across the plug gap is that which was stored in the coil when it was conducting, and its expended as Volts x Amps x Time across the gap, so increasing one causes a decrease in the others. i.e. if the voltage rises, the arcing current or spark duration must necessarily reduce. Its the sudden release of heat energy that ignites the fuel, not the fact of higher voltage, and that BLUE versus a wimpy yellow spark is what one is looking for across the plug gap. As compression is increased it takes a higher voltage to arc a plugs gap, and thats one of the reasons high energy ignitions are required in very high compression pulling tractors, cuz the typical stock 10 or 20KV ignition doest have enough punch to rise higher to arc the plug gap. Good question, sorry I have no comments on the use of pre fire. Take care n God Bless John T
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