The smaller the pulley the more under driven it is.. The 4" are the smallest commercially available. I have tried 5" and the gains weren't enough to justify the install and I have 4" on some engines that are daily driven and have been installed for 5 years now with no issues.
__________________
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
|