Hey, I'm thinking about getting my belts replaced soon, and a couple friends said that I should get different pulley(s) when I do...

Not really sure as to what a different pulley or set of them would do in terms of performance.. Searched but couldn't find much of anything other than maybe a hp or two with an underdrive pulley, but also the risk of bending the crank?

Any ideas/suggestions?

 

"The factory crank pulley has a built-in harmonic dampener, in the form of a split design, with a thick rubber pad sandwiched between two steel sheels. The dampener is designed to absorb torsional and vertical vibrations from the crank. MOST underdrive crank pulleys (with the exception of the Buschur Racing model) do not have a harmonic dampener at all.

Torsional vibration is a twisting vibration caused by the pulses of each combustion event. The force of the piston causes the crank to deflect ever so slightly in the direction of the force, and when that force goes away the crank ever-so-slightly springs back. At certain frequencies the crank can resonate, making the vibration much worse. This is where the harmonic dampener comes into play.

Although many DSM owners have removed the harmonic dampener crank pulley without incident, doing so almost certainly increases crank bearing wear, and COULD lead to early failure of the crank or crank bearings. Just how much the life of these parts is shortened is unknown.

We do have one piece of first-hand experience, to offer, though. We know of ONE instance of crank failure on the 4G63 motor. It was a 2.3-liter motor that belong to an employee of ours. The crank cracked in two -- the only time we have ever seen this happen. That block had an undampened crank pulley on it."

 

so in other words, don't do it unless I'm about to sell my car in ~ a year heh

Thanks