Yes,
They are the worst spark plugs ever and thank goodness they aren't made any more, at least I think that style is no longer made. The platinum is flush with the insulator and burns away leaving a carbon core in its place. The second problem with the flush electrode is that it does not play well with waste spark systems or any ignition that does not fire negatively from the centre electrode. Expensive, crappy plugs. Fred
Quote:
Originally Posted by JohnJL
I was doing some preventative maintenance to an 85 911 and found the plugs in this condition...the motor was running OK but will obviously benefit from a new set of plugs, wires , rotor and cap. I have never come across plugs in such bad shape...they are Bosch WR70P Platinum of unknown age...one pic below is next to new Bosch WR7DCs
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