underdrive pulley question?

Kilgore Trout · Jul 17, 2006

^ nice tech you just made the thread better...

the98stang · Jul 17, 2006

Kilgore Trout said:
^ nice tech you just made the thread better...

Killy, I never personally attacked you. I just stated that pullies will NOT harm the engine if they are installed correctly. I have respect for your opinions, and like you stated, every one is entitled to their own opinion. However, just because your car is stock, does not mean every one else has to stay that way as well.

Cobra Jay · Jul 17, 2006

Kilgore Trout said:
^ nice tech you just made the thread better...

I was just busting you chops, but just a hint.....some of your $hit gets old after a while. Not trying to be a jerk, just giving some friendly advise.

Kilgore Trout · Jul 17, 2006

I do not care about my post count. I do what I do because I enjoy helping people here, its my hobby. I do it so much the wife biotches at me for it...

I do not take anything personally for the most part...

I answer the easy ones so the real experts can focus on the hard ones.

billfisher · Jul 17, 2006

i use piggy back. the electric pump will negate the need.

blackfang · Jul 17, 2006

This is why I go elsewhere for tech because of crap like this. You try and help people out by bringing in facts from real racers and experienced engine builders. Thanks to those taking it off topic and proving why stangnets tech is in the *****ter.

I think I just wont bother wasting my time helping out anymore.

astronut1885 · May 10, 2007

Well, I might as well chime in. I ran U/Ds on a 140k mile 302 without a problem, and I plan on putting them on my 4.6 in the near future.

Fang- While your information may be credible, we are not running 500+ hp race engines, which are inherently more unstable and prone to failure. Did it ever occur to you that pullies on a high revving crazy horsepower motor might fail because it's a high revving crazy horsepower motor, and it's not the pullies? I'm sure those guys have blown just as many motors with stock pullies that you don't talk about, so your information is very slanted here. We're not going to be putting the stress on our motors that those racers do, who must balance everything down to the last milligram. On a street application, pullies are an efficient and safe way to gain power, as long as the install is done right and belt sizing is appropriate. Also, Steeda is a reputable and respected brand in the Mustang community, so I highly doubt they'd produce a product which could knowingly unbalance a motor and cause critical structural failure.

Kilgore Trout · May 10, 2007

I think it is hilarious how all the "engine builders" and "real racers" get butt hurt by people expressing their opinions and trying to help others. Its almost as if they feel that they know SO F'N MUCH that no one else is even entitled to an opinion on the matter

Its almost as funny as people criticizing StangNet because of __________ (fill in blank with whatever cry baby issue you like)

I will never reccomend pullies, if you cannot deal with that you really need to honestly ask yourself WHY because my opinion should not matter that much to you...

03ghoststang · May 10, 2007

wow this thread went form trying to give opinions to someone wether he should get pullies or not... to bashing within members .......... but anywho most of us have a moderately modified engine i say that pullies are a good mod for 200 bucks, and if anyone differs form that thats cool cause you are entitled to your opinion

streethorse · May 10, 2007

So back to the original post, does anyone know if the 04 pullies were in fact
redesigned...... On my former 99 I had the steedas and loved them...
Havnt added them to the 04 yet. One big plus that I noticed was when I
would turn on the AC it didnt drag down the power as much, you could
barley feel the compressor kick in.

CobraRed_96_GT · May 10, 2007

trinity_gt said:
They can cause damage even if installed correctly, if their design is deficient. That's the problem with them.

The crank pulley has a damper on it, a ring of iron adhered to the body with a stiff elastomer. That assembly is specifically tuned -- mass, diameter, durometer of the elastomer etc -- by Ford to dampen torsional vibrations of the crankshaft that show up at the snout of the crankshaft.

There are eight power pulses being fed into the crank every 720 degrees of revolution and because of the length of the crank, it's going to bend ever so slightly with each cylinder's power stroke. When you have eight cylinders feeding in power pulses continuously, there may be points in the rev band when the power pulses are being fed into the crank that match the natural frequency of the crankshaft (or one of its harmonics). When this happens, you can get constructive interference and a rapid increase in the amplitude of the overall vibration. Think of the Tacoma Narrows bridge to see the effects of constructive interference.

The damper is there to alter the vibration characteristics of the system by acting to dampen them. When you change the pulley to a really small diameter damper with little mass, you've taken away the only mechanism to dampen crank vibrations which Ford went to considerable engineering effort to design.

Because the oil pump is driven directly off the crankshaft (right behind the damper, timing wheel and crank sprockets), and (in part) because the OEM oil pump gears are powdered metal, it is possible for these vibrations to pound the pump gears until they shatter, usually taking the entire engine with them.

Piggybacks get a bad rep but at least they preserve the factory damper mass and design...

You do replace the crank pulley with a smaller one, but this does not mean the mass is different, just the size - the piggy back design uses the stock pulley but bolts it to the new smaller design which would "alter" dampening in the same degree of what your claiming + adding mass. Additionally, you're in a way exagerating the purpose of the dampener, the flywheel does most fo what your are describing.

281CI96Coupe · May 10, 2007

CobraRed_96_GT said:
You do replace the crank pulley with a smaller one, but this does not mean the mass is different, just the size - the piggy back design uses the stock pulley but bolts it to the new smaller design which would "alter" dampening in the same degree of what your claiming + adding mass. Additionally, you're in a way exagerating the purpose of the dampener, the flywheel does most fo what your are describing.

this thread should be called Pullies under the knife!

03ghoststang · May 10, 2007

streethorse said:
So back to the original post, does anyone know if the 04 pullies were in fact
redesigned...... On my former 99 I had the steedas and loved them...
Havnt added them to the 04 yet. One big plus that I noticed was when I
would turn on the AC it didnt drag down the power as much, you could
barley feel the compressor kick in.

as far as i know form the pullies is the water pump change in the middle of 01' otherwise

GREENBIOCH · May 10, 2007

these engine builders are running 9 sec monsters too, where as the average joe with a few hundred ponies will see benefit from pullies.

I' sure steeda engineered these pullies with engine failure in mind.

underdrive pulley question?

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