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John at J&S John at J&S is offline
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Join Date: Dec 2005
Posts: 147
I think the only time you will notice a benefit from the second plug is under load, since it helps to prevent knock.

With one plug, the flame has to spread across the combustion chamber. All the while, the temperature of the unburned mixture is increasing, and can detonate.

Two plugs reduce the time it takes to burn, so the end gasses don't have a chance to heat up as much.
Old 06-11-2008, 12:26 PM
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