![]() A colder spark plug functions in an opposite manner. 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. Therefore, the path for the dissipation of heat from the insulator nose to the cylinder head is longer and the firing end stays hotter. The insulator nose of a hotter spark plug has a longer distance between the firing tip of the insulator and the point where insulator meets the metal shell. A hot-type spark plug has a longer insulator nose. The major structural difference affecting the heat rating is the length of the insulator nose. Relative position of the insulator tip to the end of the shell (projection).Structure of the center electrode such as a copper core, etc.Thermal conductivity of the insulator, center electrode, etc.Surface area and/or length of the insulator nose.Some basic structural factors affecting the heat range of a spark plug are: Heat rating and heat flow path of NGK Spark Plugs 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. The heat range of a spark plug is the range in which the plug works well thermally. The spark plug heat range has no relationship to the electrical energy transferred through the spark plug. This is called “thermal performance,” and is determined by the heat range selected. ![]() The spark plug firing end temperature must be kept low enough to prevent pre-ignition, but high enough to prevent fouling. A sufficient amount of voltage must be supplied by the ignition system to spark across the spark plug gap. 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. The primary function of the spark plug is to ignite the air-fuel mixture within the combustion chamber under any operating condition. The experienced tuner can use spark plugs to find the root cause of problems, determine air-fuel ratios and increase vehicle performance. The spark plug displays the condition inside the combustion chambers of the engine. Spark plugs are a “window” into the engine and can be a valuable diagnostic tool. This basic guide is designed to assist the technician, hobbyist or race technician in understanding, using and troubleshooting spark plugs. 012").Spark plugs have been around as long as internal combustion engines have and are often a misunderstood component. For example: an application adding 150 bhp would require a. Adjust plug gap from factory specification (.044") approximately. We recommend inspection / replacement at 30k miles. The primary benefit of this plug is is thermal resistance making it ideal for high horsepower supercharged or turbocharged applications which experience high cylinder temperatures. Iridium plugs offer increased electrical efficiency with a narrower iridium type electrode. Iridium IX - For forced induction (supercharged/turbocharged), we recommend the Iridium IX.This plug is not recommended for a "daily driven street car" application where the engine is not at constant high RPM use due to plug fouling that may occur. We recommend this plug for use in NSX used on the track. This plug is recommended for engines producing high cylinder temperatures due to extended high RPM and wide open throttle use. ScienceofSpeed also offers the NSX-R spec spark plug which uses a one step colder heat range of 7 (for 1991-94 NSX only). This is the plug we recommend for 99% of our customers. Honda recommends replacement every 60k miles or sooner. Laser Platinum - these are the factory specified plug.Using the incorrect spark plug can lead to misfires, and/or engine damage. The factory spark plug for the standard NSX is the Laser Platinum No. ScienceofSpeed offers the same spark plug with out the dealer premium price. NGK is an original equipment manufacture for the NSX spark plugs.
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