BMW M50 / M52 / M54 / S50 - Underdrive alternator pulley
35% Underdrive alternator pulley for BMW M50 / M52 / M54 / S50 engines, Bosch -type
MAIN FEATURES OF THE KIT:
Billet aluminum alternator pulley compatible with M50, M52, M54, S50 BOSCH alternators
Replaces BMW part No. 12311432988 or 12311703736 or 12311726139 (check from the pictures, black pulley)
Increases alternator life
Reduces horsepower losses
Longer serpentine belt might be required!
COMES WITH MRT ENGINEERING DECALS
WHY DO YOU NEED ONE?
If you're building a high revving track / drifting / rally engine, here's a simple and effective solution to increase alternator life and reduce horsepower losses. This billet aluminum alternator pulley has 35% underdrive ratio compared to original pulley, drive ratio will be changed from 3:1 to 2:1.
DOES IT FIT MY CAR?
The kit can be used in most BMW M50 / M52 / M52TU / M54 / S50 engines equipped with Bosch alternator. See reference pictures of alternator and pulley type.
IS IT EASY TO INSTALL?
No special tools needed, part will directly bolt-on. Loctite or similar thread or shaft lock adhesive is recommended on installation of the pulley.
If you need any further info please contact us!
HOW ABOUT THE LIFETIME AND SERVICE OF THE KIT?
The kit does not need service while in use, always use Loctite on bolts and screws that might become loose. The kits have been proven on street and track applications by many of our customers. We're constantly doing R&D to make the kits even better, all improvements are based on customer feedback which is very important to us. Any of the spare parts can be also bought separately from us.
We want to keep our customers 100% happy thus we're only using the best materials and manufacturing processes available. Pulley is CNC machined out of AW-6082 aluminum billet.
We use DHL Express shipping for all items. Please find your order tracking information from DHL website.