NGK R5670-5-6372 Racing Plug 6372 Solid Type

【NGK R5670-5-6372 Racing Spark Plug 6372 One-Piece 】
■Product Description
For race or tuned engines!
NGK racing spark plugs are special spark plugs designed for those who engage in racing or circuit driving, or who have increased their engine's output through tuning. Choose the optimal racing spark plug for your car and aim for the best performance.

Specifications
The firing end of a spark plug is exposed to the combustion chamber, repeatedly absorbing heat from the combustion gases and dissipating it to the engine. The heat range indicates the balance between the heat absorption and heat dissipation of the spark plug's firing end. The spark plug's temperature is determined by the balance of heat absorption and dissipation, and it is necessary to select a heat range that maintains this balance for the spark plug to function correctly.
● Hot Type and Cold Type
Spark plugs that easily absorb heat and whose firing end tends to overheat are called hot type (low heat range), while those that are less prone to absorbing heat and whose firing end is less likely to overheat are called cold type (high heat range). The hot type on the left has a longer insulator and a larger surface area for heat absorption, causing the spark plug itself to reach a higher temperature. The cold type on the right is the opposite, making it more resistant to temperature increases.
● Heat Range Too Low (Hot Type)
If the spark plug temperature rises too high, it can induce abnormal combustion (pre-ignition), leading to melting of the plug electrodes and even piston seizure.
● Heat Range Too High (Cold Type)
If the spark plug temperature does not rise easily, carbon will accumulate on the firing end, causing electrical leakage and preventing sparks from flying.
● About Firing End Shape
The shape of a racing spark plug's firing end must be selected according to the degree of tuning and driving conditions. Generally, types with a firing end that protrudes into the combustion chamber offer superior ignition performance. However, they are more susceptible to hot combustion gases, and their outer electrodes are longer, which can lead to thermal or mechanical problems. As high-performance, high-output engines tend to have higher temperatures in the combustion chamber and greater engine vibration, it becomes increasingly necessary to select a firing end shape with a shorter outer electrode that is less exposed to combustion gases as tuning progresses.

■Image Disclaimer
*Images are for illustration purposes only. Products may include different sizes and colors. Product designs and specifications are subject to change without notice. Thank you for your understanding.

■Important Notes
*The heat range and firing end shape of racing spark plugs must be selected according to the degree of engine tuning and driving conditions. Please make your selection at your own discretion and responsibility.
*Please note that we are not responsible for any engine or plug problems that may arise as a result.