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Re: best plugs for cub??
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Posted by Dr.Evil on October 04, 2004 at 10:17:24 from (216.136.115.250):
In Reply to: Re: best plugs for cub?? posted by George Willer on September 30, 2004 at 07:19:29:
George is correct about heat range. If a plug over-heats the center & side electrodes melt & burn off and the plug stops firing. Not sure on the CUB but most letter series FARMALLS used a D-16 Champion plug when they were worked hard. In the mid 60's Champion came out with a D-15Y plug, cooler heat range but extended tip to get the spark down into the fuel/air mixture and that is what I have in My tired old Super H, and I bet the plugs are 20+yrs old. If You run a VERY hot plug like a D-21 and are pulling the engine hard I would say your over-heating Your plugs and risking SERIOUS DAMAGE to Your engine. Anything from detonation, collapsed ring lands, holes burned in the piston tops, burned valves, etc. It's better to err on the side of a slightly cold plug that way to hot of plug. I've made that mistake in the past and have the repair bills to prove it.
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