Racing Plug 3407

【NGK R0373A-8 Racing Plug 3407 ngk r0373a-8-3407】
Racing plugs, recommended for two-wheel and four-wheel vehicles, are designed to improve performance further when used in racing, track driving, or with engines whose output has been increased through tuning. Therefore, their shape differs from the manufacturer's standard plugs, and there may be some sacrifice in plug lifespan or low-speed performance.
However, conversely, they are developed and designed to fully demonstrate performance and withstand even extremely tuned engines or very harsh operating conditions, with a wide range of heat ratings up to very high values.
Please select the appropriate type for your specific engine to achieve full performance.
Points to note when choosing racing plugs
Determine the thread size, plug type, and shape from the part number of your genuine plug or the plug you are currently using, and select the corresponding type.
Please refer to the manufacturer's website for guidance on choosing the spark end shape.
The heat rating needs to be selected considering the increased combustion temperature due to engine output improvements and operating conditions, in order to keep the plug's spark end temperature within the optimal range.
Simply raising the heat rating alone will not improve engine performance.
Generally, heat ratings 7-8 are used for street driving, 8-9 for track day specifications, and 9-10 for race specifications.
The presence or absence of a resistor in the plug makes almost no difference nowadays due to improvements in ignition system performance.
Resistor-type plugs will become the mainstream in the future.
Conversely, non-resistor types may cause engine problems in some models of some vehicles.
In such cases, always use a resistor-type plug.
*The image is for illustration purposes only, and the design and specifications of the products shown are subject to change without notice. Please be aware of this.