Meaning of Bosch Spark Plug Model Numbers?
2 Answers
Bosch spark plug letter meanings, Part 1: English letters indicate the structure, type, and main dimensions of the spark plug. Part 2: Arabic numerals indicate the heat value of the spark plug. Part 3: English letters indicate the characteristics of the spark plug. Spark plug replacement interval: Under normal maintenance conditions, replace every 40,000 to 60,000 kilometers, but this may vary depending on the brand and engine. It is recommended to follow the user manual. Effects of a faulty spark plug: If a spark plug is damaged, it can directly cause issues such as leakage in the vehicle's ignition system, increased fuel consumption, and reduced power. The main problem is difficulty in ignition, affecting the normal use of the vehicle. Severe spark plug erosion, blistering at the top, damage, or electrode melting and erosion all indicate that the spark plug is damaged and should be replaced.
Decoding the secrets behind Bosch spark plug model numbers is quite fascinating. Take the most common HR8DPX330 for example: the initial letter H stands for a 14mm thread diameter, R indicates it has a resistor, and the number 8 represents the heat range. The heat range is crucial - smaller numbers mean slower heat dissipation suitable for daily commuter cars, while larger numbers indicate faster heat dissipation for performance-oriented driving. In DPX, D denotes a 19mm hex wrench size, P signifies an extended ceramic insulator for anti-leakage, and X represents a 0.9mm electrode gap. The suffix 330 indicates special coating technology. When I helped a friend replace spark plugs last time, I learned that mismatched heat ranges can cause engine knocking. It's best to consult the factory manual or input your vehicle model for proper matching before selection.
