I installed single platinum Bosch plugs in my 3L 2V engine (Vulcan). Ran great for 60,000 kms. Then started a misfire on plug #6 (drivers side). When I replaced the Bosch plugs, an inspection revealed that the centre electrodes were burnt on the driver bank of plugs (X3). The other bank (passenger side) looked fine, this agrees with the reverse polarity theory. Moral of the story .... use the double platinums (Motorcraft AGSF32FM), unless you enjoy plug replacement for the hell of it.
BTW the engine runs stronger & starts better with the Motorcraft plugs, the same engine ran 237,500kms on the original set!!!
Aeroman.
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Green-96, XLT 2wd, 3L Vulcan, from Ontario, Canada
All original powertrain except alternator & starter motor. 320,000 kms & going strong !
When describing the 96 Vulcan engine, the word Bullet proof is not too much of an exageration !!! Just a little TLC goes a LONG way.
I haven't read all the threads posted here, but I installed Bosch Platinum Plus 4 in both my Ranger and MH. What a power difference. Little better on fuel mileage also. Here's a link to the Bosch site.
Back in my drag racing days, we used to install new plugs on race day with the ground contact filed back to expose 1/2 of the electrode. This allowed the "fire" to be exposed directly in to the combustion chamber. It didn't have to travel arould the ground tip. At least that was the theory our pea brains used. Must have been something to it as manufacturers using the 2 or 4 ground tabs are going to it.
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