Originally Posted by mrybas
Is the idea to make the crank and water pump pulleys as large as possible? Is there limit or downside to increasing the diameter of the water pump and crank pulley?
How much did the machine shop charge? Did you bring the serpentine belt/ serpentine pulley to them and ask them to sleeve over the existing pulleys?
The alternator pulley came with the alternator so that was a fixed size. I calculated the size I wanted the crank pulley to be, then the water pump size that maintained the same ratio as the old pulleys.
I took the old pulleys and a new serpentine belt to a little machine shop and he machined the new pulleys to bolt onto the old ones.
The existing alternator mount wasn't quite right for the new alternator and the machine shop skimmed a little off the mount and a little off the alternator to make it line up. Perfect match, no stress on the belt. I then went back to the auto parts
store and bought a belt that was the correct length.
I don't remember exactly how much he charged but it was around $300 CAD.
The alternator was $320 CAD, so I saved a fair bit compared to the usual sources.