What is the difference between spark plugs A7TC and D8TC?

[LaHolden]

The difference is that A7RTC has an additional letter R, which represents the built-in resistor type for anti-radio interference. Below are the relevant details: 1. Better performance: Spark plugs A7T and A7TC, where 'A' represents a spark plug thread diameter of 10 millimeters, '7' represents the heat value, 'T' represents the insulator projection type, and 'C' indicates that the center electrode is very compatible with the copper-nickel electrode type. It might just be two different electrodes that can be used interchangeably, typically A7TC. 2. The function of spark plugs: Spark plugs are used to introduce high-voltage electricity (10,000 volts or higher) from the ignition coil into the engine cylinder, creating a spark to ignite the air-fuel mixture. The working environment of spark plugs is extremely harsh. Taking a common four-stroke gasoline engine spark plug as an example, the temperature during the intake stroke is only 60°C, and the pressure is 90 kPa.