Installed U/D pulleys, Runs Hott!! suggestions??

I've replied to other UD pulley threads (numerous times!), and I still stand by my original statements. I will also add that I will look at any 'normal' car even with mods (not a SSO type car or a hybrid setup, cars like those will be exceptions), that claims to have overheating problems from pullies and find another problem.

Ford designed this car to be able to take everything from the cold of northern Canada to the heat of the Middle East. Changing the pullies and adjusting the speed of the waterpump a little should not cause problems. South Florida or not, your cooling system is already running on the ragged edge if slowing the water pump down a little causes you to overheat -- plain and simple.

We seem to be needling each other today. Your statements seem to be in conflict with each other - specifically "Ford designed this car to be able to take everything from the cold of northern Canada to the heat of the Middle East. Changing the pullies and adjusting the speed of the waterpump a little should not cause problems." Ford did indeed design the car to meet a wide variety of climates. However, there is never unlimited flexibility in a design. It's called the design envelope and it has limits. Slowing down fan, pump and alternator speeds by as much as 25% (which some u/d's claim, and from a design perspective - 25% isn't "a little") significantly alters the performance of those components compared to their stock design. Add to that a 'tired' radiator (not uncommon in a car 15-20 years old), and you surely can have a recipe for overheating. Add a larger stereo system, electric cooling fans and higher power headlights (not uncommon mods on these cars) and you can surely have a charging problem.

Now, if I have to go through and remove the mods or completely renew the cooling system before adding the underdrives to assure 'normal' operation -- well, that makes the purchase of them a different consideration. The fact remains - there are simply too many variables car to car, climate to climate, to claim that they'll always work if everything else is in order. Just my opinion though.

Run a t-stat, I had similar problems w/ the UD pullies on a 91. You're better of w/ stock pullies and an electric fan, that's what I'm running now and it works great.

Michael Yount said:

Now, if I have to go through and remove the mods or completely renew the cooling system before adding the underdrives to assure 'normal' operation -- well, that makes the purchase of them a different consideration. The fact remains - there are simply too many variables car to car, climate to climate, to claim that they'll always work if everything else is in order. Just my opinion though.

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Poking each other with a stick can be fun sometimes...

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YES! This I agree with 100%. But I am not saying that everyone needs to have a stock car, I'm just saying it all needs to be working correctly. Whether the car is stock or modified, it can benefit from having all the components working correctly, there's no debating that. However, whether the cars in question which claim to have problems actually do, is debatable IMO.

As for percentages of changing speeds and things getting worn and so forth, sure, there are limitations. My argument has always been that if the stock parts work correctly, they will still be ok with the UD's. The various ways in which things wear and become less effecient is what makes it unpredictable in your argument -- so I try to only focus on things that work as they should.

To that end, I agree with you, and disagree with you -- but don't see any way to provide any conclusive evidence either way.

89Mustang - ok, now you've done it. You made me laugh. Touche.

Michael Yount said:

89Mustang - ok, now you've done it. You made me laugh. Touche.

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Happy enough ending for me. Thank you. And thank you for the debate.

you guys are talkin about stock systems, and its efficiency, and whether it can handle a mod like underdrives (i think they are dumb myself, but i have different priorities than others). he has no stat, a flex fan and what sounds to be a stock (18 year old radiator). so there are lots of parts squabbling away efficiency already. while one item (ie UD's) might have been alright for him, if the system was up to par, it has already been "band aided" a bit already (which he admits, the way i read it). eliminate an item like UD's, IMHO can only help him out, unless he is gonna renew most of the original and/or less efficient components.
gotta go back to JR's sig - the bottom line is key.

im not disagreeing with anyone - we all have different vantage points. im just trying to adapt what you have all said into ideas that relate to the specific situation 5 liter is having. my two cents.