Knock may occur more easily. Find NGK Racing Spark Plugs 8 Manufacturer Heat Range and get Free Shipping on Orders Over $99 at Summit Racing! Heat Range Conversion Chart. Carbon fouling occurs when the spark plug firing end does not reach the self-cleaning temperature of approximately 450°C (842°F). Installation Guide on how to install. When dealing with Bosch spark plugs, the heat range is again designated by the number in the middle of the part code; a “W8DC” has a heat range of 8 and a “W6DC” a heat range of 6. The primary function of the spark plug is to ignite the air-fuel mixture within the combustion chamber under any operating condition. Heat range - It's important to choose a racing plug with a heat range that keeps the electrode at an optimum temperature under even the most torturous racing conditions. Spark Plug Heat Range Cross Reference . The exception to this is racing plugs. There are 140 replacement spark plugs for NGK GR4. The heat range must be carefully selected for proper spark plug thermal performance. NGK: 10: 9: 8: 7: 6: 5: DENSO: 31: 27: 24: 22: 20: 16: Heat range is the measure of how fast the spark plug tip dissipates combustion heat. 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 This number indicates the thermal characteristics of a spark plug, or how ‘hot’ or ‘cold’ a spark plug is. Some types of fuel additives in lower quality fuels can cause spark plug deposits that can lead to misfires, pre-ignition, etc. This may cause damage to the spark plug and/or seriously damage the engine. Misfires can be caused by the following: Worn or deteriorated ignition system components, Spark timing excessively advanced or retarded, Damaged spark plugs (cracked insulator, melted electrodes, etc. The relationship between the spark plug temperature and vehicle speed and heat range is expressed with a graph like that in the figure. Spark plugs must provide a path and a location for electrical energy from the ignition coil to create a spark used to ignite the air-fuel mixture. Heat range; Electrode gap; HEAT RANGE. 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. Low heat range plugs have long insulator leg sections and the surface area affected by the flame and the gas pocket capacity are large. Forgot your password? A colder heat range spark plug may be necessary due to the increased cylinder temperature as boost pressure (manifold pressure) and subsequent cylinder pressure and temperature increase. 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. Learn More . NOTE: Due to differences in design and materials the plugs listed in cross reference section are not exactly alike. 2. BOBBY GERHART AND BRISK RACING SPARK PLUGS IN THE WINNERS CIRCLE AT DAYTONA 500. The heat range numbering system used by spark plug manufacturers is not universal. Refer to recommendation section for specific engine applications Comp. From there, it's transferred to the cylinder head. Modern exhaust after treatment systems require control in regard. 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 The stock number is 6596. Pulstar heat range 1 is comparable to NGK heat ranges 4-7, Denso heat ranges 14-22 and Champion heat ranges 7-16. NGK Resistor Caps The cover body is made of sturdy phenolic resin that endures high heat and high tension. Heat Range Conversion Chart Learn More . Introduction. Part Specification Listings: All available part specifications have been included in the part details page. NGK lists a design symbols chart in the front of every spark plug catalog. If you guys would like to see certain plug manufacturers added, let me know. 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