You need the bottom one, based on the photo. I think the top is for the Duratec.
If they sold you 6 identical then they SHOULD be double platinum.Hello
Well i bought plugs today from the dealer
list price 8.25 my price 6.77
However the parts guy did not know if there where Double platinum the box from motorcraft says nothing
is that the double platinum one....?
the wires im going to get from rock auto, Ill just have to call them to find out what is for the vulcan engine
Those are factory original single platinum. I took mine out at 111K on '01 DOHC and they were about done. Back side about .068" gap from .054" new spec. Mine were running fine, just time for new ones. You should expect 100K out of factory originals spec plugs.If they sold you 6 identical then they SHOULD be double platinum.
Glad you chimed in because I'm curious about this. 3 of the plugs are reverse polarity so the electricity flows in the opposite direction than the other 3. I was under the impression that the factory plugs had 3 plugs with a platinum center electrode and 3 plugs with a platinum side electrode. Is that not true?Those are factory original single platinum. I took mine out at 111K on '01 DOHC and they were about done. Back side about .068" gap from .054" new spec. Mine were running fine, just time for new ones. You should expect 100K out of factory originals spec plugs.
That is what they say they did, but mine came with all the same single platinum. Of course I replaced with double plat.No, the ones with reverse spark where double platinums...
On some, maybe many they used double platinum on the back bank, single platnium on the front bank to save $$. The back bank has reversed polarity of spark and is harder on plugs than the front bank which has forward polarity. That is if you have a coil pack and not coil on plug. I am guessing they got cheap and found single platinum could run 100K and quit the double numbers.so are the plugs i got from ford confirmed to be Double platinum?
why would ford make two different plugs for the same car?
Wire resistance is typically 3,000 (3K) ohms per foot. So longer wires have more resistance. Not likely to go over 10K ohms. Most meters will have a 20K range, and since you are not looking for precision, just somewhere in the 3K per foot, +/- 30%.Thanks chartmaker
I do have a ohm meter, ive only used it for checking batteries and my alternator...
I dont have it in front of me but what "setting" should I have it on? and Im guessing i simply take both ends of the spark wire and hook it up to the meter...
this is what I have
Mastercraft Deluxe Digital Volt Meter | Canadian Tire
Seriously man... Listen. You aren't going to find better prices at a brick & mortar store than what's available at RockAuto or Amazon for the exact same item. And most of the time, it's not even close.i havent had a chance to call rock auto to confirm what set to order but if they still work maybe Ill leave it alone....
on a side note O'Riley wanted 75 dollars for the motorcraft set so rockauto still wins the price point
Why then do we worry about coil polarity? Because the spark plugs do care which way the electrons are flowing in the high tension circuit. The spark plug has a thermally insulated center electrode (surrounded by ceramic). With engine running the center electrode runs substantially hotter than the exposed end electrode. Design of the ceramic insulator determines how hot the center electrode will run, leading to the designation of hotter or colder spark plugs. As electrons go, they love to jump away from a hot surface and fly toward a colder surface, so it is easier to drive them from hot to cold rather than from cold to hot. End result is a difference of 15 to 30 percent in voltage required to make spark "initially" jump the gap on the plug depending on which way it is going. So the spark plug prefers to see a voltage potential that is negative on the center electrode and positive on the end electrode for the very first hop of the spark. Oddly enough, this has nothing to do with polarity of the vehicle electrical system, but it is influenced by the common connection inside the ignition coil.Just curious... What do you mean by "reverse polarity"? I thought a plug was a plug, besides platinum, iridium, copper, etc. And if there are two kinds of plugs for our Duratecs, why is there only one part number?