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Ngk heat range chart8/12/2023 MFG Recommendations: approx 12:1 compression Plug: NGK R5672A-8 (stock number 7173) Autolite AR3911 Champion C63YC (stock number 796) Denso IQ24 (stock number 5314) MFG Recommendations: approx 11:1 compression Plug: NGK FR5 (stock number 7373) Autolite AR3924 (Racing Plug) Autolite 3924 Champion RC9YC (stock number 2075) Denso K20PR-U (stock number 3145) Denso IK20 (stock number 5304) MFG Recommendations: approx 10.5:1 compression Plug: NGK FR4 (stock number 5155) NGK BKR5EIX (stock number 6341) Autolite 3926 Champion RC12YC (stock number 71) Denso IK16 (stock number 5303) Stock – MFG Recommendations: approx under 9:1 compression Plug: NGK 5672A-10 (stock number 7942) Autolite AR50 Denso IQ31 (stock number 5323) Plug: NGK 5672A-9 (stock number 7405) Autolite AR3910 Champion C59YC (stock number 792) Denso IQ27 (stock number 5315) Denso IQ01-27 (stock number 5708)(diagonal platinum ground) Denso IQ02-27 (stock number 5711)(horizontal platinum ground) Plug: NGK BR7EF (stock number 3346) NGK TR7IX (stock number 3690) Autolite AR94 Denso IT22 (stock number 5327) Plug: NGK TR6 (stock number 4177) NGK TR6IX (stock number 3689) Autolite 103 Denso IT-20 (stock number 5326) Plug: NGK TR55 (stock number 3951) NGK TR55IX (stock number 7164) Autolite 764 Champion RS14YC6 (stock number 13) Denso IT-16 (stock number 5325) ****Note: NGK IX and Denso plugs are Iridium. ***Note: List is intended for reference only. Not all plug manufacturers follow the same guidelines. **Note: Heat ranges are determined by NGK standards. If you guys would like to see certain plug manufacturers added, let me know. Maybe someone can sticky it to the top so that people can easily reference it? 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. It is essential to use a spark plug that fits a specific engine and its conditions of use.Hey guys, been working on this for a little while and finally have it ready to post. NGK Spark Plugs pioneered the use of a copper cored electrode in 1958, which enables a spark plug to heat up quickly and also dissipate heat quickly giving an ultra wide heat range. The spark plug temperature rises too high and induces abnormal combustion (pre-ignition): this leads to melting of the spark plug electrodes as well as piston seizure and erosion. The spark plug temperature remains too low and causes deposits to build up on the firing end the deposits offer an electrical leakage path that gives rise to loss of sparks. Conversely, a high heat range (or cold) spark plug has a short thick insulator nose which will dissipate heat much easier (above right). When a spark plug absorbs heat produced from combustion, the heat is transferred through the centre electrode and insulator nose to the metal shell, which then transfers the heat into the engine casing and circulating coolant.Ī low heat range (or hot) spark plug typically has a long thin insulator nose which will heat up easily however will not dissipate readily to the metal shell (above left). Several factors influence the heat range of a spark plug, although typically the insulator nose design provides an indication of the heat range of a spark plug. High performance engines on the other hand produce a large amount of heat, hence a high heat range (or cold) spark plug such as a 10 heat range needs to be used to resist the heat developed by the engine. This means the spark plug will heat up easily and reach its optimal operating temperature. Generally, low power engines such as lawn mowers don’t produce a large amount of heat, hence use a low heat range (or hot) spark plug such as a 4 heat range. The term hot/cold is commonly used to describe whether a spark plug heats up easily (hot) or whether it provides resistance to heating up (cold). This number indicates the thermal characteristics of a spark plug, or how ‘hot’ or ‘cold’ a spark plug is. Typically the heat range for NGK Spark Plugs varies from 2-11.
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