Grinding noise at 4k rpm

[I2evoke3]

Hey guys I've got a 2010 Mazda 3 hatch, Gx. 2.0L Manual 77,000kms
So randomly I started hearing this whining noise, like a very quiet turbo. It would only do it under hard ish accelerating. When at idle it there is nothing. Figured it was a squeaky v belt (serpentine or w.e) changed it over no problem. Start it and no noise. Gave it a bit of has to about 4k rpm and it started to make a grinding noise and would go away after it dropped below 4000. Changed out the tensioner pully. It sound like a tin can with a hole in it. The exhaust and heat shield are fine. It's annoying and loud as hell, and im sure it can't be good for it either. Halp!

[Booter22]

Hey guys I've got a 2010 Mazda 3 hatch, Gx. 2.0L Manual 77,000kms
So randomly I started hearing this whining noise, like a very quiet turbo. It would only do it under hard ish accelerating. When at idle it there is nothing. Figured it was a squeaky v belt (serpentine or w.e) changed it over no problem. Start it and no noise. Gave it a bit of has to about 4k rpm and it started to make a grinding noise and would go away after it dropped below 4000. Changed out the tensioner pully. It sound like a tin can with a hole in it. The exhaust and heat shield are fine. It's annoying and loud as hell, and im sure it can't be good for it either. Halp!

check the ac pulley? there was a tsb for a noise from the ac pulley and it gets a spacer put in as it wasnt kicking it out all of the way. see if it makes a difference with the ac on or off.

[I2evoke3]

check the ac pulley? there was a tsb for a noise from the ac pulley and it gets a spacer put in as it wasnt kicking it out all of the way. see if it makes a difference with the ac on or off.

No difference with a/c on and off. Checked all the pullys for play and nothing. Timing chain maybe? Almost sounds like a chain being dragged across tin or plastic. Only does it from 3.7k rpm to about 4.5k rpm

[studum]

Do you get the same sound clutch in and clutch out?

[I2evoke3]

Do you get the same sound clutch in and clutch out?

Yeah same noise. Disconnected the belt and reved it too still the same noise

[dentinger]

Yeah same noise. Disconnected the belt and reved it too still the same noise

that's a bad sign.

can you post a video?

[Booter22]

open the oil cap up on the valve cover see if you can see anything odd on the top. pull the dip stick. does it smell burnt? fluid good? any files in there?

[I2evoke3]

that's a bad sign.

can you post a video?

Yeah here is the video https://youtu.be/fu87k-ux-A4
https://youtu.be/fu87k-ux-A4

[I2evoke3]

open the oil cap up on the valve cover see if you can see anything odd on the top. pull the dip stick. does it smell burnt? fluid good? any files in there?

Nope, oil was just Changed not even 500kms ago no burning or metal filings