I am reproducing both tensioner pulleys for the USA 12V and all 24V cars.
They will use larger bearing that handles 20K RPM as opposed to the current bearing max at 11K rpm. When these cars hit 6000RPM those bearings are over their max rating.
Aluminum lightweight and larger SKF bearing. Will be close to OEM cost.See more here:
http://www.alfabb.com/bb/forums/164-168-1991-1995/160965-alfissimo-new-items-coming.html
Jason
www.Alfissimo.com
Alfa Romeo Parts (Factory Alfa), Performance parts and more.
E-mail: Contact@alfissimo.com
Tel: +1 480-858-9156
1991 164QV(S) RECARO