Technical Support

Frequently Ask Questions

Basic Information

  • Q1
    What is the function of spark plug?
  • Q2
    Why are NGK spark plugs superior?
  • Q3
    What is the heat rating of a spark plug?
  • Q4
    What do NGK part numbers signify?
  • Q5
    What is the best way to select the correct spark plug?
  • Q6
    Why is the firing end appearance of a spark plug important?
  • Q7
    What is the function of the corrugations on the insulator?

Information of Various Types of Spark Plugs

  • Q8
    What is a resistor spark plugs?
  • Q9
    What is a V-grooved type spark plug?
  • Q10
    What is the Iridium IX spark plug?
  • Q11
    What is a racing spark plug?
  • Q12
    What kinds of spark plugs offer good resistance to carbon build-up?
  • Q13
    What are the features of special-type spark plugs?

Practical Information

  • Q14
    What is spark plug fouling?
  • Q15
    What are the effects of spark plug overheating?
  • Q16
    What is good ignitability?
  • Q17
    Is a stain between the insulator and metal shell caused by gas leakage?
  • Q18
    Is here a specified tightening torque for the spark plug?
  • Q19
    In addition to correct heat rating, what other precautions should be taken during installation of spark plugs?
  • Q20
    How long will a spark plug last?

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