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Originally Posted by howardjnl
Folks,
Am I correct in saying that spark plug wires for Mercedes do all of the necessory "resisting" and that's one reason to NOT use resistor type of plugs? I've seen some part places selling generic style radio noise suppressant (resistor) wire and regular resistor plugs for Mercedes and push the heck out of over priced platinum plugs.
I use OEM wires and the H9DC's. Never a problem.
John
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Your analysis is basically correct. IIRC when I measured the wire resistance on my M103, all were about 2K ohms regardless of length. My understanding is that the wires have a discrete resistors that are part of the spark plug terminal, so the wires themselves probably have very little resistance. It's also my understanding that the cap has resistors - about 1 or 2K ohm - built into each cap terminal.
Mercedes implemented a unique solution to the RFI suppression requirement. Rather than using conventional resistor spark plugs and RFI wires they have discrete resistors built into the spark plug terminals, cap terminals, and require non-resistor plugs to achieve the design secondary voltage wave form.
If you use anything other than Mercedes OE equivalent spark plugs, spark plug terminals, wire, or cap you're asking for trouble.
Duke