The copper core center allows for accurate control of heat range for longer life. The copper core electrode of the Champion spark plug provides good heat control for good wear. Sears offers the E3.20 which is an RC12YC that they warranty for life if the EMS protection is not needed. This plug has a Platinum version which should last longer. The RC provides the same service at a cheaper price. If the engine uses electronic fuel injection and computer controls, then the QC is not required. There is a special plug called the ‘QC’ A standard Resistor Plug is called the RC. As far as heat range is concerned, the RC12YC and the QC12YC are the same plug. The plugs are used for the engines of the lawn tractor. The resistance of a plug can be used to fight RFI, but can’t be measured. strontium carbonate, aluminum oxide, and copper oxide powders are used to make these extremely reliable resistors. The majority of the Champion ‘R” type plugs are Champion SAC-9 Suppressors. The standard ‘R” type is what most spark plugs have. What does the R mean on a Champion spark plug? The ‘Q” plug is required in some of the cars listed by Champion. The ‘R” stands for Resistor Plug and the ‘Q” stands for a Resistor Plug that is used to reduce noise in electronic circuits. The amount of RFI that can cause spark plugs to fail is reduced by Resistor type spark plugs. This indicates a spark plug if an R is present. Which spark plug is the best for your vehicle? Tighten the spark plug with a ratchet, being careful not to overdo it, and remove both the ratchet and the spark plug socket.There are different types of spark plugs for different purposes. Install the new spark plug by inserting it into the empty spark plug socket and placing it into the empty socket on your engine.Check the new spark plug for the correct model, size, and gap using a gap measuring tool.Use the ratchet only to make the spark plug loose and then remove it by turning the socket manually. Remove the old plug using the correct spark plug socket and a ratchet.Clean the area around the old plug to avoid any debris, dirt, or oil residue from falling into the engine.
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