Should grease be applied to the spark plug thread? It is recommended that spark plugs are checked regularly and should be replaced when they’re ‘fouled’, which is when a plug has become covered in a substance, like oil, fuel or carbon, or it has become blistered from running at too hot a temperature.” When upgrading spark plugs, though, the interval may alter and driving on LPG or CNG will shorten the life of the plug. PS: “Generally, the replacement interval is confirmed by the vehicle manufacturer (VM) – DENSO’s spark plugs mirror that advice. How often should spark plugs be replaced? Technicians should never change the gap on platinum, iridium or TT spark plugs, though, as doing so beyond the material limitations will damage the fine electrodes, which invalidates the warranty.” In that case, technicians should always use a special spark plug gapping tool to alter the opening. However, with nickel plugs, especially for motorcycles, the gap may need adjusting. PS: “DENSO’s spark plugs are manufactured with a pre-set gap.
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The DENSO Twin Top (TT) range, offers an ideal upgrade to meet these LPG/CNG requirements, but more information on how spark plugs perform with LPG/CNG can be found in DENSO Spark plug manual page: 61.” Therefore our recommendation is to upgrade to longer DENSO Iridium spark plugs, which improve ignition and engine performance, as well as extend the spark plug replacement interval. The combustion temperatures for LPG/CNG also fluctuate more than a petrol engine, thus contributing to reduced service life of up to 30%.
PS: “LPG and compressed natural gas (CNG) engines require a higher performance a spark plug than petrol engines. Which spark plug should be used for liquid petroleum gas (LPG) applications? This resource allows users to locate the appropriate DENSO parts, based on make and model information or by cross-referencing.” The easiest way to identify the correct spark plug is by checking out the DENSO E-Catalogue. Praveen Saragadam (PS): “There are many key factors to consider, such as dimensions, projection, hex and thread diameter, length and specifications such as nickel, iridium or platinum, as well as the heat range.
As a result, the DENSO Aftermarket technical team is always ready and willing to help aftermarket professionals with the answers to their questions, particularly on the topic of spark plugs, such as these presented to Praveen Kumar Saragadam, Application & Development Engineer, DENSO Europe. What do technicians need to know about spark plugs? DENSO answers the key questionsĪs an original equipment manufacturer and supplier, DENSO not only provides its customers with the quality products for which it’s so renowned, it also gives them the technical support they need to get the best from them.
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