Critical factors involved in choosing the correct spark plug heat range include: 1. It was found that spark plug orientation affects engine operation smoothness in the AFR range of operation of 14.6:1 (stoich) up to 17.6:1. The heat range is coded and given as a number on the spark plug insulator. The gap, the distance between the "Hot" and "Ground" electrode points, is set and listed by the manufacturer for optimum performance. Vehicle manufacturers recommend a specific spark plug heat range for their engines. Their recommendation for electrode gaps had better be right also. In terms of orientation, the plugs were tested at 60 degree rotational increments with everything else kept constant. It can result in incomplete combustion and damage to the catalytic converter of the car. The answer depends on the engine and application, in the vast majority of cases you should choose the heat range selected by the manufacture - they know what they are doing. 1-fuel 2-timing 3-heat range of the plug. Excessive heat is recognizable by a glazing of the insulator and/or a discoloration of the ground wire and center wire. The reach can be measured using a set of Calipers. The difference between one heat range to the next represents the ability to remove 70º - 100ºC. We does not recommend the use of fuel additives which leave deposits on the core nose of the spark plug. How does it affect performance? Spark plugs are heated by the burning fuel in the motor, and coated with the fuel's combustion products: soot, oil, etc. Most motorcycle spark plugs have a heat range of 900 to 1,500 degrees Fahrenheit. The black spots (look like pepper sprinkled on the plug) indicate a little too much heat on the plug which causes detonation by having the heated plug fire off the mixture prior to the spark firing. !High PSI tv Merchandise Available Below:http://highpsitv.bigcartel.comHelp me get to 100,000 Subs. Overlooked, that is, until they give out. One part of your vehicle that often goes overlooked but plays a crucial role is the humble spark plug. The optimal temperature to remove carbon deposits from the tip of the spark plug is 450º - 500ºC. Higher number indicate hot plug (for example 5 or 4) and low number indicate cold heat range (for example 1 or ). Most notably is the short lifespan. If the heat range is not optimal, then serious trouble can be the result. Read on to discover the ins and outs of what spark … As mentioned a spark plug operates in the range temperature 450 – 870°C, at 450°C carbon deposits being to burn off and if a plug may have a very black insulator nose at a lower temperature. Suddenly, this unassuming, unthought-of component can bring your whole day to a sputtering – or clicking – halt. For example, NGK uses a system that ranks colder plugs with a higher number and hotter plugs with a lower number, while Bosch does the opposite. A spark plug’s heat range is the temperature range in which a plug works well thermally. Other indicators of the amount of heat in the plug are the location of the heat color line on the shell threads and the ground wire. Car manufactures spend a lot of money figuring out which heat range plug is best within a lab tested manufacturer. Thanks for Watching!! No matter what type of spark plug you choose, an optimal heat rating for your vehicle’s engine is important. Rather, the heat range is a measure of the spark plug’s ability to remove heat from the combustion chamber. If it the heat range is too hot, your engine could experience detonation, pre-ignition, or power loss. i seriously had doubt in it. Spark plug heat range is the relative temperature of the spark plug's core nose. AutoZone has you covered with our extensive assortment of spark plugs so you can find the right temperature heat range plug for your specific vehicle. This creates two flame fronts that collide and can cause great amounts of damage. A very expensive heat range test can be performed however a more viable option is to start with a colder heat range spark plug and perform some testing. Autolite spark plug heat range is generally indicated by the last digit of the part number. The heat range of a spark plug is affected by the construction of the spark plug: the types of materials used, the length of insulator and the surface area of the plug exposed within the combustion chamber. The term "heat range" simply refers to the classification of spark plugs according to their ability to transfer heat from the firing end of the spark plug to the cooling system of the engine. A clean, white insulator firing tip and/or excessive electrode erosion indicates this spark plug condition. If the heat range is too cold, the spark plug will be unable to properly self-clean by burning off carbon deposits. If you drive your car normally and tune the engine regularly, you can increase the spark plug gap by about 0.010" for better performance and better fuel economy. Certain limts, the heat range '' is n't right - power is lost `` reaches '' through cylinder... Manufactures spend a lot of money figuring out which heat range is crucial http: //highpsitv.bigcartel.comHelp get! 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