3-Series (E21, E30)Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.
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Well, I guess maybe I don't need them, but I want to see if I can't get a set of more conductive spark plug wires. Does anyone know if Bosch offers an 8 or 9mm spark plug wire? I've asked this question a few times with no response, so I'm hoping that the third time will be a charm here. I just wanted to know if so, what is the part number? Anyhow, any help is appreceated.
The bosch replacement wires are 8mm. The only difference with a thicker wire is the thickness of the insulation, not the conductor inside. If you are going to change the wires it is a good idea to change the spark plugs, distributor cap and rotor at the same time.
I see, could you provide me with the part numbers. I think I might try a splitfire sparkplug this time around. I've heard that in cars with smaller displacement engines that you can notice a good improvement in them. Either that, or Copper tips. Although I was concerned that a spark too hot may damage the piston head? Anyone ever heard about this? I think I read that somewhere... probally garbage, but dunno.
I wouldn't use the Splitfire plugs, just use the recomended bosch W8DC plug. The Bosch plug wire part # i found was 09 011. I would highly recomend going with either bosch or NGK wires as they were the orginal supliers for BMW back when your car was new. Distributor cap Bosch # is 03 212, and the bosch rotor # is 04 138 and 04 038, I don't know what the difference between the two is, sorry.
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I think I might try a splitfire sparkplug this time around. I've heard that in cars with smaller displacement engines that you can notice a good improvement in them. Either that, or Copper tips. Although I was concerned that a spark too hot may damage the piston head? Anyone ever heard about this? I think I read that somewhere... probally garbage, but dunno. 
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