Featuring exclusive Heat-Active alloy, a platinum fine wire center electrode and a platinum pad ground electrode, spark plugs reach optimal temperatures quickly and maintain stable operating temperature under all engine loads, while providing maximum life and sharper spark focus. The number in the middle of the letters used to designate the specific spark plug gives the heat range. Spark Plugs: Which heat range to buy and why. "Clean Collar" massive electrode "V" tip focuses heat to reduce fouling and enhance heat range control. high performance, high revving, tuned or driven very hard), the shorter heat path will conduct heat more quickly, ensuring that the tip does not overheat. The only difference between plug RCJ6Y and RCJ8Y lies in their heat ranges. HEAT RANGE CHART Page 3 of 3 NON- PROJECTED TRUCK PLUG PLUGEZ START STAINLESS TRUCK STEEL 14mm .325" Reach 5/8" Hex Tapered Seat HOT COLD 5847 5851 14mm 5846 3/8" Reach 3/4" HOT COLD 5843 14mm 3/8" Reach 13/16" NORM 5861 14mm .460" Reach 5/8" Hex 5942 Tapered Seat HOT COLD 4113 4019 14mm 1/2" Reach 13/16" **Surface Gap HOT COLD 593 3 593 1 588 Looking at a spark plug center ceramic insulator, if the area between the ceramic and the spark plug outer steel shell is deep, that is a hotter heat range plug. Knowing which plug to use in a particular engine can be difficult, as the plugs are very similar. However, according to an Autolite reference chart, Autolite 86 has the same heat range as 2244 and Autolite 303 is a hotter plug than 2974. Generally, if a plug has a hotter heat rating it's simply not as thermally resistant as a cooler graded plug. What is Heat Range? There is a non- Champion Company heat range post/list, floating around on the internet, that is incorrect but has been referenced for years by millions of people as being true.

Spark plugs heat ranges can vary massively from plug to plug, and (rather frustratingly) can be recorded in a number of different ways, making comparison between brands rather hard. They have a longer insulator tip and they achieve a temperature higher than … The range of thermal values for BRISK spark plugs extend from the warmest to the coldest, namely 19, 18, 17, 15, 14, 12, 10 and 08. Smaller thread diameter than standard automotive plugs (12mm vs. 14mm) and yet a larger hex (11/16" vs. 5/8").
Find Champion Spark Plugs Spark Plugs with 9 Manufacturer Heat Range and get Free Shipping on Orders Over $99 at Summit Racing! "Hot" spark plugs remove heat from the combustion area relatively slowly. For instance, if a Champion spark plug's number is RCJ6Y, the heat range is 6. Heat Range - The middle number indicates the heat range of the spark plug, the higher the number the hotter the heat range. When oxygen-bearing additives are used, spark plugs one to two heat ranges …

Champion Double Platinum Power spark plugs deliver more powerful performance. Champion makes a wide range of spark plugs, including the RCJ6Y and the RCJ8Y types. Heat range is the speed at which a spark plug can transfer heat from the firing tip to the cylinder head water jacket and into the cooling system.