Spark plug wire anyone? - PeachParts Mercedes-Benz Forum

JamesDean · #1 10-11-2010, 10:35 PM

Quote:

Originally Posted by LandYaghtLover

Its a Bosh Plus Super Plug. WRD9 something, something. I have to look again. Anyway, for now I bought a plug that I can steal its screw on tip from. Then I am putting in a single small block wire. I think it will help for now until I jusy get a new set of wires. The set now is a Bosch 1 ohm set, copper.

R=resistor type plug. Some have had luck and run them anyway, however I think most of us run the proper non-resistor plugs.

You are correct the OEM Bosch non-resistor plugs are not made anymore.

However, the NGK's I've listed are suitable and every bit as good.
There are also some Champions that are a heat number above/below the spec in the manual that are still available.

LandYaghtLover · #2 10-11-2010, 10:58 PM

Quote:

Originally Posted by JamesDean

R=resistor type plug. Some have had luck and run them anyway, however I think most of us run the proper non-resistor plugs.

You are correct the OEM Bosch non-resistor plugs are not made anymore.

However, the NGK's I've listed are suitable and every bit as good.
There are also some Champions that are a heat number above/below the spec in the manual that are still available.

I read TONS of info now on the proper plugs, gap, etc. The NGK's have a bad rap. Not just in the Benz world, but I have read bad in other forums too. All based on actual experience. With Ford's 4.6l VTech the Bosch is the kiss of death with blow-outs happening often.

As for resistor or not. The factory wires have resistors built-in and resistance is not a huge factor from what I have read. Its probably best to keep it low as possible, but from everything I read going resistor or not is not a big deal. Same for wires.

In the end, as is always the case, copper wires and copper plugs provide the best performance and economy. But copper plugs also require more frequent change intervals.

For now my silicone wire and plug tip cap install are working very well. Amazing how the car feels after dropping down to a 0.032" gap from a 0.045"!!

rayhennig · #3 10-12-2010, 01:22 AM

Beru makes both non-r plugs and wires. All to original spec.

Also caps and rotors.

Beru is good.

Stick with non-r plugs.

R

david s poole · #4 10-12-2010, 12:44 PM

if you go buy a set of wires buy BERU or aftermarket with BERU plug ends on them[made by a least one co.in california.]based on personal experience the bosch wires you have now only hold up for about 3yrs so don't blame yourself for the broken one.