Running too cold a plug can only cause it to foul out, whereas running too hot a plug can cause severe engine damage. NGK 94460-1 Heat Range 8 Laser Platinum Spark Plug for 2016 Audi A6 Quattro Premium Plus. The term heat range refers to the speed with which a plug can transfer heat from the combustion chamber to the engine head. At RPM Outlet, we have been running NGK plugs for … 5 (NGK) Denso 5325 IT-16 Projected Sotck Heat Range. The heat range measurement is determined by several factors; the length of the ceramic centre insulator nose and its’ ability to absorb and transfer combustion heat, the material composition of the insulator and centre electrode material. Hoping to sell in bulk, but will consider splitting up. The primary method used to do this is by altering the internal length of the core nose. A good rule of thumb is, one heat range colder for every 75–100hp added. The spark plug temperature rises too high and induces abnormal combustion (pre-ignition) ; this leads to melting of the spark plug electrode that could cause problems such as piston seizure. For additional assistance contact NGK customer service at 877-473-6767. size & hex heat standard standard power tip power tip platinum double enhanced alloy premium shielded surface reach range (non-resistor) (resistor) (non-resistor) (resistor) platinum technology™ small engine (resistor) gap 10mm 5/ 8" hot 3136 1/ 4" cold 510mm / 8" hot 4194 5438 8290 1/ 2" cold 10mm 5/ 8 Have an OE part number or competitors part number you'd like to find an NGK equivalent for? Triple seals prevent leakage. Hoping to sell in bulk, but will consider splitting up. NGK spark plugs use a heat range index ranging from 2 to 12 with 2 being the hottest spark plug and 12 being the coldest. Corrugated ribs prevent flashover. The heat rating of each NGK spark plug is indicated by a number; lower numbers indicate a hotter type, higher numbers indicate a colder type. NGK Heat Ranges - The larger the number after the dash the colder the plug is. Whether the plug is to be installed in a boat, lawnmower or race car, it has been found the optimum combustion chamber temperature for gasoline engines is between 500°C–850°C. Importance of Heat Range The heat rating is a measure of the amount of heat dissipation.The heat range of a spark plug is the range in which the plug works well thermally. For example, R6120-85 has a 8.5 heat range and R6120-105 has a 10.5 heat range. They have a longer insulator tip and they achieve a temperature higher than … Using the NGK Cross Reference. To contact them, click here. Some NGK Racing Plugs are also available in half heat ranges. ngk pulstar denso champion bosch; hotter: 2 9: 18, 19: 10 4: 1: 14: 14, 16: 9 5: 1: 16: 11, 12: 8 6: 1: 20: 9, 10: 6, 7 7: 1: 22: 7, 8: 5 8: 2: 24: 6, 61, 63: 4 9: 2: 27: 4, 59: 3 9.5: 2: 29: 57 10: 2: 31: 55: 2 10.5 32: 53 11 34 11.5 35 colder: 12 37 Choosing the right heat range is crucial for high performance engines. The spark plug design determines its ability to remove heat from the combustion chamber. The term heat range refers to the speed with which a plug can transfer heat from the combustion chamber to the engine head. Some NGK Racing Plugs are also available in half heat ranges. For example, a 10 heat range in Champion is not the same as a 10 heat range in NGK nor the same in Autolite. Some basic structural factors affecting the heat range of a spark plug are: 502, Fifth Floor, JMD Pacific Square, NGK Spark Plugs (U.S.A.), Inc. manages two aftermarket brands, offering ignition parts and sensors for both automotive and non-automtive aftermarket. Example a R5671A-7 (a good street/strip plug) is a cold plug where a R5671A-10 is a very cold plug used for large 400hp and up nitrous and other power adder applications) The heat rating of each NGK spark plug is indicated by a number; lower numbers indicate a … ... Understanding Spark Plug Heat Range One of the most misunderstood aspects of spark plugs – is the heat range. Be the first to know about sales and promotions. NGK Spark Plugs are designed to operate over a much wider heat range than ordinary plugs. 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