spark plug clearance refers to the minimum distance between the center electrode and the ground electrode, English spark gap, it is one of the most important parameters of spark plugs, automotive spark plugs common clearance value between 0.6 mm to 1.5 mm. According to the market stock of 2,000 common
The spark plug data of automobile models are as follows. It can be seen that most clearance values are 0.8 mm and 1.1 mm. (Note: This article is only for automotive spark plugs)
1. The expression of the gap value of each brand spark plug
Clearance very affect the performance of spark plug, so different models must use the manufacturer recommended clearance value, not too large or small. Each brand of spark plug has a model number, usually at the end of the number or letter to represent the gap value.
Bosch — At the end of the model, S, T, U, V, W, X, Y, Z is used to represent 0.7mm, 0.8mm, 1.0mm, 1.3mm, 0.9mm, 1.1mm, 1.5mm, 2.0mm in turn. Generally, T (0.8mm) is directly omitted and not marked. In fact, many models do not indicate the gap value.
NGK — At the end of the model or where the second number appears, 6, 7, 8, 9, 10, 11, 13, 15 are used to represent 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.3mm, 1.5mm, generally 8 (0.8mm) is omitted directly.
Denso — At the end of the model or where the second number appears, 6, 7, 8, 9, 10, 11, 13, 15 are used to represent 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.3mm, 1.5mm in turn, generally 8 (0.8mm) is directly omitted. Iridium models do not indicate clearance values.
