Perfectly OK. When they build the engine they use platinum plugs almost
like the aftermarket ones. Aftermarket plugs are platinum plated on both
the point and electrode but half the originals are plated on one only. We
assume this cuts costs a bit on the big scale but for replacements, it would
likely cost more to supply both so we can only get the ones that have both
sides plated. Something about the electrical characteristics of the spark
transferring metal. Use the double platinum plugs, the one side is just
getting a slightly better plug than specified.
Hope this Helps
Double platinum is just fine. I think what Ford did is save a bit of money
on spark plugs. My understanding is that some of the plugs fire from center
electrode to ground, while others of the plugs fire the opposite way due to
the fact that some get +voltage, and some get -voltage. Where the platinum
needs to be depends on which direction the spark is traveling. Ford,
therefore, saved half on platinum by only putting it where it has to be.
If you get plugs with platinum at both ends of the gap, you're literally
covered either way.
To further illuminate:
Count the coil packs, note you have 1 per each 2 cyls... unlike the
legacy ign systems where one side of secondary (Hi-V) connected directly
to ground, each coil fires once per rev and is wired:
Gnd --plug A -- coil neg &&& coil pos -- Plug B -- Gnd
Thus both plugs are fired on each trigger
Yeh, I'm a Krusty old Geezer, putting up with my 'smartass' is the price
you pay..DEAL with it!
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