Quote:
Originally Posted by mctwin2kman
They used non-resistor plugs due to the plug wires, cap, and rotor all have 1KOhm of resistance built into them. By adding more resistance to the mix using a resistor plug you will not get the required spark, at least not all of it. Therefore you may not burn your air/fuel mixture as efficiently and thus waste gas or put more carbon in your combustion chamber. I have used both platinum and non-resistor plugs in my 190 and I can tell you there is a difference and the non's work better and the engine runs better. I also switched to NGK wires as they stay within spec warm or cold where I found Beru and Bosch that did not.
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Makes a lot of sense for engines with wires and distributors. However, my '96 SL600 has coil packs on top of each plug - 12 of 'em. Now there could be resistance built into the electrical stub from the coil to the actual plug, but I hesitate to dismantle a coil pack simply to investigate. Could this be why my V12 seemed to run better with Bosch Platinum+4 plugs, while the more traditional distributor/wires engines do not? Don't know, but I would sure like to find out.