I had my 2000 Z in storage for 5 years and just brought it back out this summer. I changed out the oil/filter, fluid in the M6, diff lube, swapped out the brake fluid, and primed everything. Everything pretty much went well minus some aching and groaning from the suspension for a bit as it sat on jackstands the whole time. It turned 30k on the drive up.

It runs fine, etc., but if I drive the car for over ~30 min, it starts to whine. It is pretty loud and almost sounds like a gear drive or a small blower. It is not when the car gets up to operating temp - it has to be good and warm. If I don't drive it straight for ~30 minutes, it won't make the sound. It is directly related to engine RPM. It doesn't matter what gear I am in, whether the clutch is in/out, how fast I am going, etc. More RPM=more whine. It isn't too bad at idle, but as the RPM's go up it gets pretty noticeable.

TIA to anyone who can help out. I'd like to take it to a show & go over July 4th to see what it will run, but need to figure this out first.

 

check all the pulley's with the belt off, spin them by hand and see if you hear it. if nothing, reinstall the belt and rev the motor with the tb by hand.

while listening to the alternator case with a long screwdriver or metal bar, long extension etc. willing to bet its the alternator and a bearing has gone dry or something.

or... maybe its the air pump?

 

This is probably correct. A pulley bearing or an alternator bearing probably dried out during storage.
If it's a pulley check out the sticky at the top of this forum for instructions to lube it.