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Totally a wild guess on my part, but I think there were more spark plug problems with the 5.4 because there were more of them than the 4.6 or 6.8.
Nope--the 4.6 was used in so many cars that I'm pretty sure it was the most common of the mod motors--and having been on Crown Vic forums, I don't remember any significant talk of blown plugs being a problem whereas on truck forums, there was always a lot of talk about 5.4 and 6.8's blowing plugs out.
The 4.6 was also really quite common in trucks (think of fleets) yet you rarely hear of a blown plug in the 4.6. Again, with each "explosion" in the 4.6 making less power/force/pressure than similar explosions in the 5.4 and 6.8, there would be less force in the combustion chamber. This in itself would reduce the amount of stress and vibration that the plugs are subjected to.
The vans stuck with the 2 valve engines simply because the 3 valve heads didn't fit within the confines of the body. Rather than redesign the doghouse area, they just stuck with the 2 valve engines.
The vans stuck with the 2 valve engines simply because the 3 valve heads didn't fit within the confines of the body. Rather than redesign the doghouse area, they just stuck with the 2 valve engines.
I think you're right. This is the same as Ford using the old 302/5.0 engine in the Explorer through 2001 even though the mod motors were in all the other cars and trucks by then.
05-09-2011, 12:26 PM
