Weird Belt sound

[spederman]

Just got a new belt installed after some idler pulley issues & a shredded belt from some alignment issues. Idler pulley that got replaced is maybe a tiny bit smaller than the original pulley(0.25-0.5 inches smaller). The belt is the same size as before, but for some reason the new belt makes a repetetive thwacking/chirping sound for about a minute until its warmed up. once its warmed up, the sound is gone. The belt is a cog style belt and running it with an 8 rib setup/Vortech S trim. Any clues to why it would be making that sound until its warm?

 

[SVT32VDOHC]

Try a new tensioner. When I S/Ced my Cobra, I bought a forged steel belt tensioner. That thing is more heavy duty than the stock aluminum one, and it helps with mods like yours.

 

[spederman]

The tensioner is brand new. thats why i'm so confused on this issue. Everything is freaking brand new and i dont understand what this sound would be. And why it only does it for the first 1 or 2 min until its warmed up and then dissapears.

 

[Ryan441]

i put a new belt on my car and it will squeik for the firt couple min until its warmed up and then its fine