Underdrive Pulley

[PetersRedYaris]

I would say if you plan on keeping your car a LONG time and running it into the ground, an undampened pully is probably not a good idea. The factory designs them that way for a reason... Having said that, I'm seriously considering getting one for my Xb. I figure even if it does decrease engine life (which is debatable), I never keep a car long enough to see this reduced life. But, if your going to run a lightened pulley, you chose the best available...

Just so everybody knows, a year of trouble free use doesn't confirm anything... Post these statements in 10 years.

[Malaya1221]

fyi: have the set of pulleys for a year now w/o a problem!

http://en.wikipedia.org/wiki/Underdrive_pulleys

paragraph 3:

Changing the original crankshaft pulley can have negative effects if the replacement pulley is not manufactured properly. A crankshaft or accessory pulley that is not machined or balanced properly can cause severe damage. For most domestic V8s a harmonic damper is necessary to absorb crankshaft vibrations. Early to mid-year V8's kept the pulley and damper as separate components. Most late model V8s now integrate the damper and the pulley into one part. For small displacement engines found in many import and domestic vehicles (4.0L and under) the original crankshaft pulley only serves to quiet noise vibration and harshness (NVH) you hear in the occupant compartment. Although it may look like a damper on V8's engines it serves no protection function to the engine. It is the same as the baffles and resonators found in the intakes and exhausts systems of most cars today that serve to make the engine as quiet as feasibly possible. The first things most enthusiasts do is install high flow intakes and exhausts; the quieting function is eliminated.

[ruimond]

Originally Posted by PetersRedYaris

Just so everybody knows, a year of trouble free use doesn't confirm anything... Post these statements in 10 years.

Haha i doubt i would even keep my car for that long anyway.