The like to be "experts" often say that there is no difference in spark plugs, and that the mixture either gets ignited or not. The reason is, that in order to get the best possible performance, the spark plugs have to be carefully matched with the appropriate application and intended use. Sometimes customers wonder, why there is so many different spark plug gap firing configurations. 012", even though they are equipped with some of the highest output ignition systems providing in excess of 60,000 Volts high current and high mJ power output. Some applications such as ProMod turbo cars using M1 fuel frequently run a spark plug gap as small as. That reason is why high power vehicles (1,000 horspower and more) often run a spark plug gap as small as. Higher fuel concentration has the same effect (lower A/F ratio). The dense A/F mixture is much harder for spark to penetrate, and require much higher voltage (pressure). 050"), and applications with high cylinder pressures (high compression, forced induction - turbo, supercharged, nitrous applications.) require spark plug gap smaller than. Generally the applications with low cylinder pressures (low compression ratio) running lean A/F (Air/Fuel) mixtures have large recommended gap (around. In either way the spark will not occur between the spark plug electrodes inside the combustion chamber, and engine misfire will occur. However running a large gap in high cylinder pressure application (which makes it very hard for spark to occur), will demand such a high voltage (electrical pressure) for spark to jump the spark plug gap, that the spark will find an easier way to the ground, possibly where the igniton wire is close to the ground (engine block etc.) or inside of distributor cap, inside of the ignition coil, on the outside of the spark plug (between the plug and the boot) etc. This is generally desired in applications with late model high output ignition coils and lower compression naturally aspirated engine applications where cylinder pressures are relatively low and easy for spark discharge to occur. That means that there is higher voltage build up in the ignition system (ignition coil, distributor, ignition wires) prior to the spark discharge. Large spark plug gap setting demands higher voltage (electrical pressure) for spark to jump the large distance gap. This can be caused for example by loss of insulating property of ceramic due to conductive carbon build up from the combustion process (spark plug fouling). The only case when the spark will travel longer path to the ground, is when the longer path is more conductive (provides less resistance). As the spark always follow the path of least resistance, spark gap is generally the closest point between the spark plug center electrode and the spark plug ground electrode which is sometimes formed by the spark plug shell itself. On a conventional spark plug, it is the area between the center and the ground electrode. Spark plug gap is where spark plug spark discharge is designed to take place. Spark Plug Gap - understanding the basics For Champion spark plugs it is a little less logical and is as listed below: Part numbering for Brisk, NGK and Denso spark plugs is reasonably logical with the trailing digits transposing directly into size in mm. Brisk RR15IRY-7, gap size is 0.7 mm, Brisk GOR15YTE-3, gap size is 1.3mm NGK BKR6E-11, gap size is 1.1mm, Denso T16EPR-U15, gap size is 1.5mm, Champion RC10YC4, gap size is 1.0mm).
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If there are trailing numbers after the part number, then the gap should be specifically set as per the manufacturer's part code designation (e.g. 032"., Brisk Extra Turbo Spark Plugs and some others. The " -T" indicate LGS style spark plug with a Tighter gap than standard LGS style spark plug and should be used on applications where the recommended gap setting is less than. The exception are for example spark plug part numbers with gap that does not need to be adjusted and can not be changed, such as Brisk Premium Multi-spark plugs, Brisk Premium LGS Spark Plugs, Brisk Premium LGS-T spark plugs, Brisk Extra Turbo Spark Plugs and some others. If your spark plug part number has no trailing digits then (for most part numbers) it will be preset to this specification. Most Brisk and other manufacturer sparkplugs are preset to around 0.75mm - 0.8mm. Also, the spark plug gap should never exceed. Excessive changing of the spark plug gap setting will result in weakening of the spark plug ground electrode and can lead to breakage. The spark plug gap adjustment should not be changed more than 3 times and should not exceed. The force should be applied ONLY on the spark plug ground electrode strap moving it closer or further away from the spark plug center electrode. The very most important rule when checking or adjusting spark plug gap is, to never pry, apply or exert any force on the spark plug center electrode, or center electrode ceramic insulator.
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