Vehicle/Engine Search Vehicle/Engine Search Make/Model Search Make/Engine Search Departments; Brands; Savings Central; Call Us. NGK.com specializes in hard to find NGK products. We are not NGK Spark Plugs USA. The special V-cut center electrode and concave ground electrode of NGK's V-Power spark plug increases ignitibility. For example, take the 254x plug series. A colder heat range spark plug has an insulator design with a shorter heat flow path to the metal shell of the plug. Iridium IX® vs. OE Iridium Spark Plugs NGK builds two types of iridium spark plugs: OE Iridium and Iridium IX®. One misconception is that the heat range is related to the spark temperature or intensity. Typically the heat range for NGK Spark Plugs varies from 2-11. 1969. $2.08 + $12.50 Shipping and material, plugs produced by various manufacturers do not have exactly the same heat range. Learn more. New NTK Technical Sensors. 2544 is the coldest plug in that plug family, and 2546 is the hotest. Installing a hotter heat range plug will reduce the pre-ignition safety margin, so it is better to correct the mechanical or tuning issue instead of changing the plug heat range. Don't just ask for a spark plug, insist on NGK. Free Returns. 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. Specials. The last digit in an Autolite part number represents the heat range within a plug family. 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. One of the most misunderstood aspects of spark plugs – is the heat range. All dual precious metal plugs are designed to provide maximum longevity.… Read More. If the heat range is too cold, the spark plug will be unable to properly self-clean by burning off carbon deposits. A COLDER or 'harder' spark plug is more suited to a hotter running engine (i.e. 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. For a spark plug to function properly, it must have a tip temperature high enough to burn off carbon deposits (self-cleaning) and avoid fouling, while remaining low enough to avoid overheating the ceramic firing end and pre-ignition. The term hot/cold is commonly used to describe whether a spark plug heats up easily (hot) or … Spark plugs may physically appear to be the same but have a different heat range based on the insulator design or shape. 2544 is the coldest plug in that plug family, and 2546 is the hotest. Learn more. These ideas are both false. The spark plug is heated during combustion and must dissipate that heat to the cylinder head at a certain rate to avoid overheating the ceramic firing end. In identical spark plug types, the difference from one full heat range to the next is the ability to remove 70°C to 100°C from the combustion chamber. NGK Denso Champion Heat Range Equivalents A Spark Plug's heat range is a measure of it's ability to conduct heat away from its firing end. To contact them, click here. Shop Now . Part Type: Spark Plugs. Mon-Fri 8am-12am ET / Sat-Sun 9am-10pm ET. Share - NGK V-Power Heat Range 5 Spark Plug (UR5) - ngk2771. The optimal firing end temperature is approximately 500°C (932°F) to 800°C (1472°F). As a result, more heat stays in the ceramic firing end and less is dissipated to the engine. Read more. Generally, if a plug has a hotter heat rating it's simply not as thermally resistant as a cooler graded plug. Its OE legacy, unsurpassed quality and leading vehicles in operation coverage reinforces NGK as The Ignition Specialist. Depending on the modification will … Advanced Tuners/Engine Builders Section. For example, R6120-85 has a 8.5 heat range and R6120-105 has a … For example, take the 254x plug series. Find many great new & used options and get the best deals for NGK Spark Plug 2771 UR5 at the best online prices at eBay! Mon-Fri 8am-12am ET / Sat-Sun 9am-10pm ET. Actual OE or equivalent replacement spark plug. 100% Guaranteed Satisfaction Hassle-Free Returns Awesome … There are 72 replacement spark plugs for NGK UR5. Autolite has 2544, 2545 and 2546 available. Another common misconception is that the spark plug is designed as a heat sink to “remove” heat from the combustion chamber. Shorty Spark Plug: No Resistor: Yes Manufacturer Heat Range: 5 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. If the heat range is not optimal, then serious trouble can be the result. 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. 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. Spark plugs are designed to operate in a temperature range of 450 – 870°C, when an engine is modified (generally to produce more power which produces more heat) in turn the engine and subsequent spark plug temperatures increase. Designed to operate over a much wider heat range than ordinary plugs. Choosing the right heat range is crucial for high performance engines. NGK UR5 - Alternative spark plugs. Therefore, it is impossible to chart an Autolite heat range hierarchy, let alone a standardized comparison to other spark plug brands. Often hotter heat ranges have been used to address a fuel delivery or oil consumption problem. 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