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Old 03-08-2013, 08:25 PM   #7
Engine Surgeon
 
Join Date: Aug 2008
Location: Cleveland GA USA
Posts: 2,425
I have found that cooling is better at higher speeds with the under driven pulleys. I've only been testing different diameters of them for over 6 years now.

I have driven a car 28,000 miles in one year with a 4" UDP on the street and track in winter and summer and had no adverse effects, even with every accessory on in traffic on a July day with a 95F ambient temp.

Results always vary.
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Jake Raby/www.flat6innovations.com
IMS Solution/ Faultless Tool Inventor
US Patent 8,992,089 &
US Patent 9,416,697
Developer of The IMS Retrofit Procedure- M96/ M97 Specialist

Last edited by Jake Raby; 03-08-2013 at 08:27 PM.
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