Below is a list of some of the possible external influences on a spark plug’s operating temperatures. To contact them, click here. document.write(name); All applications, illustrations and technical information detailed on this site have been assembled based on the latest information available. The insulator nose length is the distance from the firing tip of the insulator to the point where insulator meets the metal shell. Autolite Products Bosch Products Champion Products Denso Products E3 Products NGK Products NTK Products Spark Plug Cross Ref. Below is NGK's spark plug part number decode. Fast shipping and great service! NGK spark plugs are original equipment on many outboard motors and are excellent replacements for everyday engine maintenance. This means the plug has a higher internal temperature, and is said to be a hot plug. we recommend ngk instead, and traditional electrode-gap rather than surface-gap plugs where possible. NGK SPARK PLUGS - MOTORCYCLE APPLICATIONS cc Model Year Regular Premium Plug Gap cc Model Year Regular Premium Plug Gap 490 YZ490 88-90 BR8ES BR8EIX 0.032 490 YZ490 82-87 --- BR8EIX 0.024 500 SC500 73-74 BR8ES BR8EIX 0.024 500 SR500 80-81 BPR6ES BPR6EIX 0.032 500 SR500 78-79 BPR7ES BPR7EIX 0.032 500 TT500 76-81 BPR7ES BPR7EIX 0.032 As the cylinder temperature decreases, so does the plug tip temperature, Many mechanics attempt to “chase” tuning by changing spark plug heat ranges, The real answer is to adjust jetting or air/fuel mixtures in an effort to put more air back into the engine, Defined as: ignition of the air/fuel mixture before the pre-set ignition timing mark, Caused by hot spots in the combustion chamber…can be caused (or amplified) by over advanced timing, too hot a spark plug, low octane fuel, lean air/fuel mixture, too high compression, or insufficient engine cooling, A change to a higher octane fuel, a colder plug, richer fuel mixture, or lower compression may be in order, You may also need to retard ignition timing, and check vehicle’s cooling system, Pre-ignition usually leads to detonation; pre-ignition and detonation are two separate events, The spark plug’s worst enemy! 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. Most frequently caused by hot spots in the combustion chamber. The temperature of the spark plug’s firing end must be kept low enough to prevent pre-ignition, but high enough to prevent fouling. Get your engine running with a full line of spark plugs, coils and wire sets from NGK. If the tip temperature is lower than 500°C, the insulator area surrounding the centre electrode will not be hot enough to burn off carbon and combustion chamber deposits. The spark plug Cross references are for general reference only. Reach, Gasket Seat, Each Part Number: NGK … Whether the spark plugs are fitted in a lawnmower, boat, or a race car, the spark plug tip temperature must remain between 500C-850°C. Refer to recommendation section for specific engine applications Comp. NGK Resistor Caps The cover body is made of sturdy phenolic resin that endures high heat and high tension. Most of the damage that an engine sustains when “detonating” is from excessive heat, The spark plug is damaged by both the elevated temperatures and the accompanying shock wave, or concussion, A spark plug is said to have misfired when enough voltage has not been delivered to light off all fuel present in the combustion chamber at the proper moment of the power stroke (a few degrees before top dead centre). As the piston is being forced upward by mechanical action of the connecting rod, the pre-ignited explosion will try to force the piston downward. document.write(city); From the high-tech Ruthenium HX™ to the industry standard OE-style spark plugs, NGK drives the future of spark plug engineering. 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. Therefore, it is impossible to chart an Autolite heat range hierarchy, let alone a standardized comparison to other spark plug brands. spark plug application and information evinrude/johnson 1952-2010 evinrude/johnson motors ship with champion spark plugs. This is detonation. /* script places appropriate state into page */ The spark plug works as a heat exchanger by pulling unwanted thermal energy away from the combustion chamber, and transferring the heat to the engine’s cooling system. We sell high quality NGK Spark Plugs for Tecumseh Engines and other replacement parts online. There are additional decodes available for NGK US specification plugs. Air/fuel mixture should be leaner, depending upon ambient temperature. For example, a 10 heat range in Champion is not the same as a 10 heat range in NGK nor the same in Autolite. Technical. A projected style spark plug firing tip temperature is increased by 10°C to 20°C. , View full size version of NGK performance plug numbering chart. 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