This is a very often discussed topic at the Mach1 boards, of whom share the same 4.6L DOHC engine that we have. I guess I have two questions that I hope the powers of higher knowledge can answer for me...
1) Do the Mach1's have different pullies than us? I'd say about every 8 of 10 people that do the U/D Pullies (Mach1) report zero gain, or say they have lost power, and describe U/D pullies as a waste of money.
2) Is an oil pump failure possible from U/D pullies? There have been a handful of Mach1 owners that have had the oil pump fail after doing this mod. How about any problems with the A/C?
It seems that over here at this board we praise the underdrive pullies for what they do for our land yachts, so it would make sense if the pullies between our Marauders and their Mach1s are different. I read somewhere on their board that they (we?) already have Ford's version of underdrive pullies.
"The harmonics of the underdrive pulles are causing the cast oil pump to fail." - Mach1 Board
Related Thread - http://www.mach1registry.org/forums/...ad.php?t=31092
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