Alternator pulley

Have you been able to verify its the alternator belt? If so, have you checked the pulley alignment and inspected the belt? I think the fact its a high HP engine is totally irrelevant.

I'm not 100% sure it's the belt, but haven't found what else it could be.

The belt is new, and it's tight. I've looked at alignment briefly, if consensus is that this is the cause I'll do it again.

Maybe not because of high HP, but this engine revs faster than any other big engine I've experienced (except my boss' Ferrari 599), and since it only makes noise when accelerating, that was my guess. But keep the suggestions coming...

If you have the AC still working, check the bearing in the AC tension pulley. If it is just starting to fail it could do what you are describing.
Doug M

Thanks Doug, but the A/C tension pulley is brand new from Ipsco, and the car had this sound before I changed tension pulley.

quote:

Mikael

Hello Mikael
I had this problem a many years ago on a Chevy Camaro. I could not figure out which belt was squeeling, was it the power steering or A/C belt. They were both new and both tight. Between the sounds of the motor and fan running.....who could tell. My thought process was if I can't figure out what is squeeling, maybe I could figure out what was NOT squeeling. So I used a bar of soap. With the engine running at idle, I SOFTLY held the bar of soap against one side and then the other side of the A/C belt. Then Reved up the motor and still had the squeel. So I soaped the power steering belt and that stopped the squeeling. With that I pulled of the power steering belt, scrubbed the both pulley grooves for the belt. I took a steal yard stick and laid it accross both pulleys to verify or at least try to verify their alignment. From what I could see, I found the alignment to be pretty good. So I cleaned the belt and put it all back together. And it didn't squeel. A couple of week later the squeel came back. So I sat and watched the A/C belt as I reved the motor. The belt didn't hop around or attempt to cant or off angle it'self off to one side as it approached the next pulley, it looked even looked like the V of the pulley matched the V of the belt. ..... in the end I took a can of belt grip, sprayed it into a rag and slightly wiped down the inside belt area between the pulleys. Fired it back up and no more squeeling...................... in fact no more squeeling for about 3 more years, at that point I took the car swiming one night.......but that's another story. Good Luck....... Doug.H #6434

Belt squeal is pretty telling, can also create that noise by increasing the load on the ALT by turning on headlights, A/C, etc and reving the engine a bit.

I would pull the cover and check the pullys' and belt for glazing (looks shiney and cooked)and alignment with a straight edge. If the pully is glazed but not worn (the V side walls of the pully should be straight)they can be sand blasted to get the glaze off, the belt must be replaced. Also, these engines are known for pully misalignment due to the mounting brackets and length of belt. See pic of how far mine was out of alignment! I ended up heating the brackets to bend back into shape. I have a higher amp alt that now runs without ruining belts every month. Am still thinking of installing an idler pully to help wrap the belt a bit more on the Alt pully.

Sorry about Picture size!

Alignment before (squealer)



Heating lower bracket to realign (on car)



Cooled and aligned





If the pully is glazed, hopefully it is just the Alt pully, I ended up blasting all of my pullys and powdercoating them.

Anyway, good luck and let us know what you found out.

Angelo

Thanks for all the help. But I just found out the noise isn't the belt

On a drive today I did something I don't think any driving instructor has ever recommended: Look in the mirror when you floor the accelerator. But I did on a deserted road, and I've found that the noise is present exactly when the secondary throttles on my double-pumper opens and closes. Unless someone disagrees, I wouldn't be concerned about that.

Personally, if there was a noise coming from my drivetrain that I could not pinpoint..... I would be concerned, it would drive me nuts until I found it.

Just courious, what and how can you discern about the noise from a rear view mirror?

The carb is placed high, and I can see the secondary axle, so I can see when it opens. And now that I can, yes, it's a flute/whistle noise. Been there always, and engine runs fine, so I'll leave it