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Old 02-28-2003, 07:10 PM
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Has anyone found that splitfire of bosch platnum etc.. give you better performance than a set of champions? I have heard conflicting stories on this, and wanted to get more opinions. Rodney, Colorado Springs

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Old 02-28-2003, 07:14 PM
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I don't believe in Splitfires and other multi-electrode spark plugs working any better. I bet it's just a scheme for companies to get more money.Just get some double platnums. Steve
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Old 02-28-2003, 07:23 PM
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i put some bosch platinum +4s in my 302 cuz i heard MSDs will eat up anything less in a couple thousand miles. Then i heard that if one of the 4 electrode things break off, the sparkplug wont work at all.
It makes sence though, MSD advertises that itll give you a more powerful spark and give you more power and economy. So if you get a bigger spark from the actual spark plug rather than the ignition box, itll probably do the same thing.
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Old 02-28-2003, 07:30 PM
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can't beat autolites. not to be an ****, oh well heregoes, who runs bosch multi electrodes professionally?
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Old 02-28-2003, 07:44 PM
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i don't have any experience with them, but i've read that the smaller electrodes on the splitfires and whatever else are actually not beneficial for several reasons. the smaller electrode cannont handle the heat and will act like a light bulb filament, getting destroyed rather quickly. i've also read that the extra surface area associated with multi electrodes will actually block some of the fuel air mixture causing an uneven burn. i don't know if any of it's true, but it seemed to make sense, i would like to have any input on this and see what you guys think as well.
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Old 02-28-2003, 08:58 PM
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Here's what I know about Split-Fire plugs. Electricity takes the shortest path to ground. My thoughts were that the spark will jump to only one of the "splits" from the electrode. And I was right (I checked it out). My theory is that after the plug has some miles and some wear. The spark will have eaten enough of the side of the tip (one side of the split), that it will eventually be persuaded to travel to the other side of the tip. And at which point it will still only fire alternately from side to side (not both at the same time). Possibly the magnitude of the spark (amperage as well as voltage) might influence the spark jumping to both tips at the same time (I checked it out with an HEI). I didn't get to check my theory on any plugs with any mileage. I was wondering if there's anyone out there that has any of these type plugs with some miles that have checked this out. I'm sure I'm not the only one that ponders these things.
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Old 02-28-2003, 09:11 PM
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[quote]I'm sure I'm not the only one that ponders these things.<hr></blockquote>

That shows an inquisitive mind...something very important for this profession...
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Old 02-28-2003, 09:31 PM
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I like Champions for tuning because the nickel plating burns off in a manner so I can read combustion temps from them.

For regular use I like the heat range accuracy of NGK's, they seem to build a better more consistent plug in my experience.
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Old 03-01-2003, 12:04 AM
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30 years of wrenchin and I found champions to have a high failure rate. Most common problem was ceramic cracking. Once the ceramic cracks you get a voltage loss down the side of the plug to ground. You can see it on a scope because of a lower voltage spike. Spray the plug w/ a water bottle (mister) and you car see the spark going down the ceramic. best to do at night. They easly crack when installing if your plug socket is slightly out of alignment w/ the plug. Better plugs like bosch, autolite, A/C, motorcraft, ect. have stronger ceramic and electrodes. I like platinum plugs because the electrode material doesnt burn up like std plugs.
Current goes from the center electrode to ground. It jumps better from the sharp corner of the fresh electrode than from a round (worn) one. Less chance of misfire with new or platinum plugs because of the clean sharp tip. Take a plug wire of any cyl and install a plug in the wire. Ground the plug or lay it on air cleaner and start the engine. You can watch the spark jump and it only goes to one end of a split fire at a time. The spark jumps back and forth between the two ends. (dont spray carb cleaner on the plug when its up there.....uh......cuz it makes a big fire).
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