You aren't going to gain anything because the power is in the fuel and air, not the spark. Many specialty plugs require a larger gap to make that hotter spark, and that requires a higher voltage from the ignition coil that many of them can't develop. I've heard many stories about engines running poorly and all that was needed was to put the right plugs back in. If there was anything to be gained by using a different spark plug, the manufacturer would have put them in originally.
Tuesday, March 12th, 2013 AT 8:54 AM