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Old 03-03-2009, 07:19 AM   #11
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Dayco part number 89006 is a 3.5" metal pulley. Personally I don't see as much of a difference between them. A bearing can go bad on either metal or plastic pullies. They probably use the same bearings in both as well.
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Old 03-03-2009, 08:03 AM   #12
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The bearing may be the same, but at least with the metal pulley, if the bearing goes bad, the whole pulley doesn't meltdown/explode. That could mean the difference between making it home, and being stuck on the side of the road with your */c belt knotted up in the acc belt when it'* 15 degrees outside.
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Old 03-03-2009, 10:09 PM   #13
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Quote:
Originally Posted by Y2KSTARSHIP View Post
The bearing may be the same, but at least with the metal pulley, if the bearing goes bad, the whole pulley doesn't meltdown/explode. That could mean the difference between making it home, and being stuck on the side of the road with your */c belt knotted up in the acc belt when it'* 15 degrees outside.
Yeah, that'* what I was happy not to have had happen when mine went out. My pulley was gone...
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Old 03-04-2009, 08:29 AM   #14
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I've seen the whole gamet guys. Metal pullies can pop off the bearing too.

When a pulley makes noise..it should be replaced. If they dont' give you warning..that'* bad.
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Old 03-04-2009, 02:12 PM   #15
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Yeah, I agree, but you don't always have the warning with those pulleys. I never got any warning with mine. I don't know if the composite construction helps to mask the bearing noise or what, but it was quite a surprise when it let go.
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Old 03-04-2009, 07:18 PM   #16
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I would simply buy the OEM replacement under normal circumstances, but since I went with a smaller SC pulley for more oompf, I would imagine it taxes the pulleys a bit more. That was why I was thinking about the metal one. I am wondering if it can handle the extra stress of higher RPMs better. If it helps, then I'm sold, but if it doesn't matter the OEM is 5 bucks cheaper ;P

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Old 03-04-2009, 07:51 PM   #17
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I still have all stock plastic pulleys and I run a 3.2" pulley. Some times they just go out.
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Old 03-05-2009, 09:39 AM   #18
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Changing the SC pulley size doesn't overdrive the rest of the pullies unless you change them to a size smaller.

Crank is turning the same rpm, all the other pulles are also turning the same as before, the only thing moving faster is the SC.

If anything, the plastic would provide a lighter pulley and reduce the spinning mass and power needed to get it moving faster. The amount will be small though.
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Old 03-05-2009, 09:18 PM   #19
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good info - will just get the poly oem one. thanks again for all the help and advice.
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Old 03-09-2009, 11:53 AM   #20
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What size star tool is that to install the new pulley? I think I may need to buy a tool to do the job...

thanks
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