Whining Noise at 3.000 from the left air intake

It could be something in the gearbox transmission = bearings of driven gear, intermediate gear or driving gear. I did have that once but the noise was between 2.000 and 3.000 rpm.
Here is the message about my problem
https://www.ferrarichat.com/forum/threads/sticky-mondial-8-qv-3-2-t-repair-thread.209843 look #6

 

Are you 100% sure it's not the perforated exhaust tips? They get old , break down and can whistle.

 

I think you'll probably find out it has something to do with the oil cooler fan, not sure how but that seems like the most reasonable suspect.
The fan itself is unfused and always hot, but there's a relay somewhere, I don't know where it is that you might be able to pull it and see if the sound goes away. It's not shown on afterburners relay fuse box diagrams. You might be able to pull that relay and see if it stops the sound.
I'm sure someone here knows where it is.
Alden

 

The oil cooler fan does not go on until the car is very hot. The relay is attached to one of the bolts that retains the fan shroud, probably best accessible through the wheel well.

Some wild card ideas:

1. The exhaust check valve on the front bank. Rubber internals can fail, corrision internally happens, maybe sets off at a resonant frequency when the engine revs at 3,000rpm.
2. The vacuum can that holds some vacuum to actuate the heater controls might be leaking? Maybe the small diameter hose that attaches, along with a check valve should be inspected.
3. Something is vibrating at the resonnant frequency of 3,000 rpm? Snug up the grill screws.
4. Maybe the oil cooler mounting nuts are loose (they are nyloc if original so should not be loose, but anything is possible).
5. There is a seconday heater motor/pump on the 3.2's that might be acting up after the car warms up, maybe a failed bearing within that heater pump. Turn you heater on and off while the engine is running and see if it makes a difference.

 

Some of your ideas probably have merit, but when I hear a problem associated with a "whirring"noise it makes me think "fan."
I know the oil cooler fan is" supposed"" to come on at high oil temperatures, but..
My thought was that something was causing the fan to come on at that specific RPM and it would be easy to just disconnect power from the fan to see if that cured the problem, simple to do.
Alden

 

Indeed, that fan relay may well be accessible from the top and removing the connector might be easy to do. I replaced my oil cooler fan relay at the same time of replacing fuse box relays based on some of your advice on relay replacements! I wasn't sure where the relay was until I went in through the wheel well.

That secondary heater pump would also be a source of whirring. There is a small o-ring inside that pump at the pump shaft, if it leaks/weeps the coolant gets into the electrical part and bearing and there goes the pump, it likely won't be leaking enough to see externally. I had to replace my pump, luckily it is still available the part crosses to the 355 with trivial variation to the wiring harness position.

 

Well, considering I'm the relay replacement guru, apparently, LOL, can you tell me exactly where the fan relay is in the engine compartment? Can you get to it to replace it from the top without going thru the wheel well? I've never replaced mine, in fact I think that is the only relay I haven't replaced in my car! Got a Bosch part number for it?
Alden

 

My first guess is the lower oil cooler line is just vibrating against the chassis at those RPMs.

 

I don't think it will be easy to get at from the top, it is mounted on one of the bottom studs that holds the oil cooler in place.

The original relay is F part number 61914500. It is an Italmec relay 215 8B.

I got a NOS replacement from my local Ferrari dealer. Not sure what the Bosch cross reference might be. Picture shows the pin configuration.
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