Just installed a lightweight underdrive crank pulley.

[douglas vincent]

http://cgi.ebay.com/ebaymotors/ws/eBayI ... AMEWN%3AIT

Bought it off of Ebay for about $56 including shipping. Looked real nice and shiny out of the box.

Big Problem though.

The grooves for the belt were not the right depth, ie the pulley looked like /\_/\_/\_/\_/\ instead of /\/\/\/\/\. Thank God I have a mini lathe. I chucked up the pulley and recut all the grooves to the right depth.

Then I bolted it on with no problems and started the search for the right size belt. The stock belt is 34.5" and the one I needed is 33.5" which is not a stocked size at most Auto part stores but I finally found it for $10.99 at Schucks.

Since I had to recut the grooves and drive around looking for a belt it took about 3 hours to do. Had the pulley been cut right and I had a belt it would have taken about 15 minutes.

Do I notice a difference? Yup, but how much I have no real clue. Sure is shiny though!

[BAC5.2]

What kind of vibration increase did you see?

Supposedly, our engines use the pulleys as harmonic balancers. Now, inherent to Boxer design, the engine should be balanced naturally, but I've heard some stories from WRX friends that say the pulleys made their engine violently shake.

I've got enough NVH as it is, I don't see a need to kill my new and shiny engine mounts

[douglas vincent]

Absolutely none.