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?