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#1
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Spark Plug Gap
I know that this question has been asked a hundred times before and I hope no minds if I ask it again. With a 440, 9.5-1 comp., MP electronic ignition, MSD Blaster 2 coil and Bosch Platinum plugs, what would be a good spark plug gap? The instructions that came with the MP electronic conversion kit said to gap the plugs at .035 (seems kind of small). Any suggestions would be greatly appreciated.
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#2
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Start there and open them up to find best performance. You'll know when you have gone to far. It'll miss fire and or performance will drop off. Use a track to track times.
Between you and me, I'd .040 to start. |
#3
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I just gap them at 0.040" and put them in.
I haven't experimented with different gaps. I'm not sure I would notice a big difference, and I don't have a good way (repeatable) to verify any gain or loss. |
#4
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I've run both .040 and .045 with my Msd and Blaster2. I didn't notice any difference. So now I put them in and gap them .040. Supposed to last longer, but since I use Autolites(cheap) and change them every year this wouldn't be a problem anyway.
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#5
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Chrysler knows what the correct gap should be. Almost 100% of Chrysler engines built over the last do years or more are gapped at .035.
If you use a high powered after market ignition,such as MSD or Holley, Accel etc. Then gap your plugs the way the ignition mfg.recommends. Dennis Jokela |
#6
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All spark plug gap does is to decrease/increase voltage at the plug. The wider the gap, the more voltage the coil must develop to jump it. It's all in ohm's law. Current or amperage goes down with voltage, and vice versa, and the higher the resistance, the greater the voltage must be to jump the gap. Engines which produce high compression pressures must decrease gap because spark does not travel as readily at high pressures. Hotter ignitions get around this. Wide plug gaps are typically used in low compression engines where pressure will not interfere as much with spark travel. The wider the gap the hotter the spark, the better the ignition, the cleaner the burn. It sounds like you have a pretty decent setup there, so wide plug gaps will not work as effectively in your engine as they would in a lower comp. engine. Bottom line: .035" is probably fine, and you can play with it if you want to, but the performance gains will be nominal. Also remember if you're a racer that every little bit counts. The choice is yours.
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#7
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I have a rich idle problem and i tried experimenting with plug gap. I currently have mine set at .050 and it has helped me a lot. Every motor even with the exact parts may want something different so go from .040 and have fun.
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