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Understanding the "Heat" range is easy.
EXAMPLE: The heat range for a RV15YC6 is the "15" (ignore the 6, it is the gap)
After you have identified the numbering system for your plug, merely raise or lower that number to change the heat range.
Remember, CHAMPION PLUGS GET HOTTER THE HIGHER THE NUMBER, COLDER THE LOWER THE NUMBER.
Say you are starting with a RCJ7Y
if you want a colder plug, you would use RCJ6Y
if you want a hotter plug, you would use RCJ8Y
Champion Early History, in brief
Albert Champion was born in France in 1878. By 1899, Champion came to America to compete in a series of bicycle and motorcycle races. He had brought several bicycles and motorcycles from France, but found the parts very hard to locate in the United States. Champion began making spark plugs to help pay bills and cover expense and sold them to friends in Boston.
In 1900, Champion immigrated to America. By 1904, Champion moved to Flint, Michigan where he founded Champion Ignition Company for the manufacturing of spark plugs and dynamo's. With the help of investors, Champion was able to turn his motorcycle and automobile racing hobbies into a successful business. Unfortunately, problems with the investors lead to a break up in 1905. Champion soon found himself without a company. The investors continued to manufacture the spark plugs under the Champion name, but Champion himself was removed.
In 1908 with the backing of the Buick Motor Co., Champion began a new company called the AC (Albert Champion) Spark Plug Company and he was appointed president. In 1916 Alfred P. Sloan formed United Motors Corp. (soon to become GM) and eventually acquired Buick and AC Spark Plug.
What’s the diff between QL86C and L86C. Does it make a diff in my 4hp Johnson outboard?
Submitted by: CanadianChef
The difference between a QL-series spark plug and an L-series spark plug is the inclusion of a radio-frequency noise suppressor in the QL-series.
Using the QL-series plugs will tend to reduce the amount of radio-frequency energy and noise produced by the ignition sparking of the engine. There are several reasons why you might want to reduce the amount of radio-frequency noise produced, and they all are based on the concept of interference. There is obvious potential for radio-frequency noise generated from the engine ignition sparking to interfere with radio-frequency receivers near the engine. The boat’s VHF Marine Band radio will be a prime target for interference. However, even if your boat does not have a VHF Marine Band radio, you may want to use the QL-series plugs.