Originally Posted by ROSCO
What is the "waste spark" feature. I am not farmiliar with this. Is there somewhere that I can read up on it?
Is it a recurculation of raw fuel in the exhaust trough back pressure or somthing? I'm just guessing. I'd be interesed to learn about it. Let me know.
Also, is it worth it to get a little better set of wires? Because my wires were autolite (I think) and they are all cracked. Accel wires I see alot but I am not sure how good they are. Id like a strong thick plug wire. It dosent have to be preformance just ones that will hold up.
Does the Denso Irridium spark plug work well in the ranger? If so is double platinum or single irridium better?
Originally Posted by OTRtech
The "waste spark" he refers to is on 4 cyl. engines with dual plug heads. The coils are wired so the secondary plugs fire on the exhaust stroke.
As for plugs , stay with autolite/motorcraft double plats.
Takeda had and earlier thread he posted pics of plugs and why to use double plats.
Basicly one side of the engine fires the spark from the center electrode to ground.
The opposite side fires from ground to center electrode.
On non-platinum/single platinum plugs this results in uneven wear on the electrodes.
Flex Fuel Spark Plugs
I should have explained a bit more, this covers the base. The upshot is, if you use single plats, the electrodes on one side of the engine will wear faster than the other, as such one side wears much faster than the other. It should also be noted that both sides common to a coil fire once for every turn of the engine. Good linky too, I happen to know Bob (Takeda), we've been in touch for some time now. In my travels on the subject (can't remembered where), I came across a guy who pulled his OEM plugs, kept them in order, and inspected, What he found was that one side of the engine had plugs with plat center electrodes, and the other had plat ground electrodes. The part numbers were different. It may have been Bob, I'll ask next time we talk. Kinda a cheapo way of saving a few bucks when new.
On Edit: I had a 94 with the 4.0 that I bought new, the wires finally started to fail at 181,XXX miles and 10 years, 3 months after I bought it and right before I sold it. I'd have to say those Motorcraft wires delivered pretty good service. There were a lot of highway miles in there, better air movement that putting around town, so I'd expect less wire life for a vehicle used heavily in town or somewhere like Arizona. Heat degrades that insulation.