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I did some more research and found that the Champion plug ul18v is at the hottest end of the scale and the NGK plug BUHX is at the colder end of the scale. Why they cross reference as a match is beyond me. So the mystery is solved, I think.
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I had a drag car one time....Chevy small block. Everybody made fun of me because Chevy supposed to have à AC plugs....the way I had the engine set up cam and all the AC plugs wouldnt get it. I had to use Champions. When Champion found out about it....they sponsored me.
I have spent most my life fishing........the rest I wasted.
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Crappie.com 3K Star General
I dug a little deeper and found a forum from 2002 where they were debating the champion/NGK issue. It appears that the NGK BUHX plug is a booster gap type plug and it takes more voltage to fire properly and the Force ignition system doesn't always supply the voltage needed. Champion plugs don't demand the higher voltage. An NGK alternative is the BUHW which isn't a booster gap plug and works well with lower voltage. So I guess it's not really a hot issue but rather a voltage issue.
The older I get the more I realize the therapeutic benefits of fishing
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You found the issue Jerry. It is a voltage issue as opposed to a hot plug issue.
The newer NGK plugs that require more volts typically run in stator (not starter) style motors that generate more voltage.
The stator produces voltage needed to operate things like snow machines and even boat motors with battery less EFI (electronic fuel injection).
Unlike a car or other motor that generates electricity to run EFI through an alternator, things such as snow machines, boat motors, and many of the newer non carburated small engines require an electronic source "stator" to operate the EFI. The battery is only a starting source. This obviously results in higher voltage production thus things like spark plugs were designed to run or operate with higher volts. Conversely, run one of the other plugs in a stator motor and see what happens! The outside white ceramic cracks and turns to dust.
How do I know all of this? I ran snow machines that were carburated and EFI and ran two different style NGK plugs in both.
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