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27 What does the Bosch spark plug number mean? |
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27 What does the Bosch spark plug number mean? |
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This article is from the VW Technical FAQ, by with numerous contributions by Jan Vandenbrande others.
A: For example: WR7DTC
W = Diameter (?) W= 14 mm (?)
R = Resistor (Radio interference suppression, not vital(?))
7 = Heat Range (lower numbers = colder plugs)
D = Length (?)
T = Tri-cathode. If missing, single cathode
C = Copper Anode
Other values, Missing = Carbon, S = Silver, P = Platinum
0 = Final character, Special Electrode configuration (see below)
Continue to:
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