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Old 02-26-2001, 06:04 AM   #1
Frank
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Join Date: Jan 2001
Post Too few miles for Underdrive Pulley??

My car is not out of its "breakin" period. Should i wait till @1000 miles to slap on my Udrive pulley or will it make no difference just to put it on now.
Thanks,
~Frank
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Old 02-26-2001, 08:40 AM   #2
RidinLow
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I didn't wait to do mine & I never had any trouble. I also happen to have a silver one with belts for sale if you're interested .
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Old 02-26-2001, 09:08 AM   #3
Frank
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well i already have the pulley. thanks for the info.
~Frank
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Old 02-26-2001, 11:09 AM   #4
TSDScooby
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Frank,

I was about to install my UD pulley but then I came accross the posting below. Now I have some serious doubts.... just an FYI.
http://www.i-club.com/ubb-files/Foru...ML/001676.html
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Old 02-26-2001, 11:45 AM   #5
Frank
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well i already had my Dinan e36 m3 so i know all about that. That's more for inline 6's and 4's because they (by nature) are unbalanced and need the harmonic and vibrational dampeners. My knowlegde leads me to believe that the flat 4 is much more balanced and the firing of the pistons equalizes (read cancels) most of the vibration thus eliminating much of the nead for dampeners. Thats just my take on the situation and i could be totally wrong.
~Frank
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Old 02-27-2001, 01:31 AM   #6
donjuan
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I can't wait to read the "My crank pulley looks like it's wobbling" threads...
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Old 02-27-2001, 01:34 AM   #7
Frank
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well my friends my00 rs has had the UD pulley for 9000 of its 12000 miles and has had no problems as of yet.

[This message has been edited by Frank (edited February 26, 2001).]
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Old 02-27-2001, 01:40 AM   #8
donjuan
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Go for it then, best of luck
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Old 02-27-2001, 01:48 AM   #9
micah
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Post

As someone posted on the older thread, the engine may be balanced against _lateral_ vibrations but the pulley is for _torsional_ vibrations.

There can't be a "balancing" of the types of torsional forces we're worried about because I'm quite sure that all the pistons tend to rotate the crank in the same direction

In general, I would say if the stock pulley has the damper, it's there for a reason. What's more, based on anecdotal evidence, the stock damper is _not_ there for NVH concerns (people report the engine feels smoother with the UD). What does that leave?

Just my $0.02
mbs
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