idler and tensioner pulley where changed and the noise is gone but I didn't drive much since it was fixed so I hope it's going to last

thanks for the comments, much appreciated, going to call the garage which installed the cams two weeks ago give them my car to check, I'll post info when they have found the problem.

timing belt poof all gone

Sounds like your f*****g b-shaft belt. Mine went and it made a similar noise. You should have that checked out since it could take out your t-belt.

sounds like water pump or alternator.

It sounds like the alternator. Is that the original one or is it a rebuilt one. Bc its not coming from the motor from what i can hear.

First, you have to realize that the block and head act as harmonic resonators. Therefore, a noise that appears to come from below may indeed be coming from somewhere else. That noise sounds similar to rod bearing slippage. But it can be the symptom of other things as well, such as valve tapping, cam sprockets rubbing the inside of the timing cover, etc. Was there any kind of break in period suggested for the cams? And if so, did you follow them?

GSC S1 mive cams insidecams where put in by a professionnal not me and I had no noise whatsoever for 13 days..and I checked regularly, suddenly this noise appeared friday evening and it's coming from the left side and lower area, it's not coming from the vvt/camshaft sprockets I removed the upper timing belt cover and the sound was going from lower than that.The belts look like they are fine, no slack or visible wear whatsoever, judging by the temperatures and what I can see using evoscan the car runs fine.I don't have the tools nor appropriate place to do complex mechanic so I'll have to bring it to a garage :/Was supposed to bring my car for tuning monday, not going to happen until I know where this is coming from.It may be many things, the lower timing cover touching, a pulley, the water pump ? Will post info when I have some.Found 3 videos with a sound like this on youtube so it's not something new.

Did you put aftermarket cam gears on? If you did you have to trim the inside of the cam cover. I know I had to when I put fidanza gears on my evo viii. I see the mivec so I know its a IX. What kind of cams did you buy?

Is something touching the timing cover?