It must do this in precise and controlled manner so the spark plug will: Stay cool enough to avoid pre-ignition and/or electrode destruction due to detonation. And remember : A higher heat-range number does not improve engine performance, it increases the plug's ability to dissipate heat. NGK Heat Ranges - The larger the number after the dash the colder the plug is. From there, it's transferred to the cylinder head. My Cart Find My Vehicle's Spark Plug. The heat rating is expressed as a number. Autolite's numbering system does not have a standardized heat range identifier. Binder ID: 2133843. Spark Plug, Racing, Tapered Seat, 14mm Thread, 25mm Reach, Heat Range 8, With Resistor, Each. The last digit in an Autolite part number represents the heat range within a plug family. Part Number: NGK-93400 Not Yet Reviewed The two most common causes of spark plug problems are carbon fouling (< 450°C) and overheating (> 800°C). A misfire occurs when the spark travels the path of least resistance instead of jumping across the gap. The premium Pro 50 GB plan gives you the option to download a copy of your binder to your local machine. See cross reference chart for NGK GR4 and more than 80.000 other spark plugs. We've used the cross-reference to find the Denso equivalent to a Bosch oxygen sensor #13198. Knock is related to ignition timing. Yes. 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. Explanation of a Spark Plugs Heat Range from NGK Spark Plugs USA This basic guide is designed to assist the technician, hobbyist or race technician in understanding, using and troubleshooting spark plugs. From the world leader in Spark Plug and Ignition Lead technology comes a premium range of quality Ignition Coils. Heat Range Reference. Pre-ignition occurs when the air-fuel mixture is ignited by a hot object/area in the combustion chamber before the timed spark event occurs. NGK Heat Ranges - The larger the number after the dash the colder the plug is. many heat ranges to suit all engine applications. Heat Range; Identification and Construction; Maintenance; Spark Plug Diagnosis; Spark Gap Location and Design; Advantages; Contact; Deal Of The Day; My Account. The listed heat range represents the plug's ability to dissipate heat. Occurs when part of the air-fuel mixture in the combustion chamber, away from the spark plug, is spontaneously ignited by the pressure from a flame front originating from the spark plug. Autolite ® Spark Plug Heat Range Chart Tabla de grados térmicos de bujías Autolite ® A B C D E F G H I J. THREAD IRIDIum XP The insulator nose of a hotter spark plug also has a greater surface area that is exposed to more of the ignited gases and is easily heated to higher temperatures. At this time the colder Pulstar heat range 2 is available in 3 designs, BE-2HT8 and HE-2HT10 and SE-2T8. If the heat range is not optimal, then serious trouble can be the result. Charts & Tools Charts & Tools; FAQs FAQs; Non-Automotive Non-Automotive; Product Information Product Information; Vehicle Maintenance Vehicle Maintenance; Learning Center. It's fairly hard to compare each manufacturers heat range since there are so many factors involved but this is, in my opinion, the closest match for NGK's heat range system, which was used in the chart. Introduction. Higher cylinder temperatures near the knock level will bring the spark plug firing end temperature closer to the pre-ignition range. The two colliding flame fronts contribute to the “knocking” sound. See cross reference chart for NGK GR4 and more than 80.000 other spark plugs. If you guys would like to see certain plug manufacturers added, let me know. 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