Drivetrain (Cooper S) MINI Cooper S (R53) intakes, exhausts, pulleys, headers, throttle bodies, and any other modifications to the Cooper S drivetrain.

Drivetrain Determining pulley reduction ratio / belt size on vehicle

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Old Jul 2, 2008 | 01:15 PM
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muladesigns1's Avatar
muladesigns1
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Determining pulley reduction ratio / belt size on vehicle

I have a 2004 MCS with a reduction pully installed. (bought it this way).
I am looking at the pully but do not see a name or part number on it. I spoke to the dealer and they said that if it is bolted on, not pressed. It is def not stock.
Now I am wondering what kind of headache i am in for when it comes time to change the belt!

Any Ideas, or solutions?
 
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Old Jul 2, 2008 | 02:26 PM
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RandyBMC
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No headache at all. A NAPA 060539 will work on just about every pulley size. If it is a 19%, you can go with a 060535. The other option that always works is the Gates JCW belt from the dealer. The belt tensioner will take up slack on the belt to a point, so it isn't as critical as you may think.

Measure the pulley's diameter, and I can tell you which reduction size it is. If you have a good picture of it, I can probably tell as well.

Hope that helps!
Randy
 
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Old Jul 2, 2008 | 02:32 PM
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muladesigns1's Avatar
muladesigns1
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Originally Posted by RandyBMC
No headache at all. A NAPA 060539 will work on just about every pulley size. If it is a 19%, you can go with a 060535. The other option that always works is the Gates JCW belt from the dealer. The belt tensioner will take up slack on the belt to a point, so it isn't as critical as you may think.

Measure the pulley's diameter, and I can tell you which reduction size it is. If you have a good picture of it, I can probably tell as well.

Hope that helps!
Randy
Great! Thank you for the help. I guess I shouldn't have worried so much after all the pully is only 15%, so if you think about it, it's only maybe a 3/4 inch difference, if that?

Im not in need of it yet, but will save this part number.
thanks again
 
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Old Jul 2, 2008 | 05:21 PM
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RandyBMC
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From: Denver
With the 15%, either the JCW or the 539 will work great

Randy
 
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