if i don't have my numbers mixed up on champion plugs the higher the number the hotter most people have misconceptions on heat ranges,some are scared of hotter heat ranges fearing engine damage,if your was running ok with the 21 range then switch back,a plug chart showing what effect heat ranges have on a plug would make it easier to understand, the whole purpose is to get the range that's cold enough that it won't damage the plug from high operating temperatures in the cylinders under heavy load and high rpm, on the other end of the spectrum is one hot enough to prevent carbon fouling from low cylinder temperatures ,low rpms ,slight oil usage, ect.and but not hot enough to damage the plugs cause denotation and a few other problems,use to work for an outfit that their mechanics at the garage would tune up a truck with a 427 engine using 10 range plugs, which was fine on a good engine being run on the road at high speed ,but shortly after arriving on the job site they would start killing spark plugs due to low rpm operation, less engine loading and long idles i have used as high as a 17 heat range to prevent fouling. would solve the problems until they went back to the shop and got tuned up again because the manual recommended 10's and that's all they would use
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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