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Home > Technical Support

Q&A

Proper engine operation requires the following three conditions.
Even when a good fuel and air mixture is supplied to an engine and good compression exists, the engine will not start without good spark production.
A quality spark plug is a critical part in the production of good sparks; this Q & A Booklet is designed to provide you with technical information about spark plugs and instructions on how to use them.

Q1 What is the function of a spark plug?

Q2 Why are TORCH spark plugs superior?

Q3 What is the heat rating of a spark plug?

Q4 What do TORCH part numbers signify?

Q5 Why is the firing end appearance of a spark plug important?

Q6 What is the function of the corrugations on the insulator?

Q7 What is a resistor spark plug?

Q8 What is a V-grooved type spark plug?

Q9 What is the Iridium spark plug?

Q10 What kinds of spark plugs offer good resistance to carbon build-up?

Q11 What is spark plug fouling?

Q12 What are the effects of spark plug overheating?

Q13 What is good ignitability?

Q14 Is a stain between the insulator and metal shell caused by gas leakage?

Q15 Is there a specified tightening torque for the spark plug?

Q16 In addition to correct heat rating, what other precautions should be taken during installation of spark plugs?

Q17 How long will a spark plug last?
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