R Theory Motorsports Billet Aluminum Water Pump Pulley

This upgrade has no real purpose except that it weighs a little less than the stock pulley and it looks cool. It adds to my blue engine bay accents that started years ago with NGK spark plug wires.

Front of the engine with the air intake crossover tube removed
OEM Mazda water pump pulley

Remember to break loose the 3 pulley bolts before removing the belt or the pulley will just spin when trying to loosen the bolts.

Alternator belt tensioner loosened and water pump pulley removed
OEM pulley compared to R Theory upgrade
Pulley grooves for 4-rib belt
OEM water pump pulley 15.5 oz (440g)
R Theory Motorsports billet aluminum water pump pulley 9.5oz (270g)
Small nick in the anodization on the pulley

The pulley had a small chip in the blue anodization that I touched-up with some leftover blue metallic paint from my fuel rail project.

Fixing the scrape with a dab of metallic blue paint
Fixed water pump pulley blue anodization
Upgraded water pump pulley installed – not quite matching blue with the FM belt tensioner
Full engine view with all of the blue accents
New pulley spinning!
Subtle blue pulley
PartPrice
NA/NB MX-5 Miata Billet Aluminum Water Pump Pulley$80 (2024 Black Friday sale)

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