noise in head when revved NOW WITH VID

[JTURBOGSX]

so today I come out this morning to start up the old dsm.... blah blah let her warm up everything is normal.... Then i give her a free rev I hear this noise coming from the head or turbo so I rev it a few times to hear this noise that sounds like a dirt bike but with a little deeper of a growl. so I I checked my turbo for shaft play etc everything. is good. fn phone sucks or I would take a video I just went and listed to it again almost sounds like somethings loose in the head

 

[Cali2gGST]

possible exhaust leak?

 

[JTURBOGSX]

I wish I hear rattling noise coming form the the black left of the head

not my car but a similar noise sounds just like mine when he revs it http://www.youtube.com/watch?v=m5iHzFlylqU

 

[JTURBOGSX]

bump anybody help i dissembled my motor to see if i spun a bearing. nope all the bearings were perfect.... so I moved onto the head everything looked fine i pushed on each of the lifers trying to see if one was bad

Im at a loss right now id like to re assemble the motor

 

[90gst_sean]

Damn buddy, I dont mean to be a downer, but that sounds bad.

So, nothing was loose in there? no medal parts at the turbo intake?

What about the trany..?

well good luck.

 

[95Eclipse]

Bent valve maybe? do a cylinder compression test...

 

[tsi4g63dohc]

i know you said you checked the lifters but i have a noise like that and a guy that machined my extra head said it sounded like a collapsed lifter .... just throwing it out there

 

[BogusSVO]

when you checked the bearings, did you look at the pistons, you may have a cracked/busted skirt, or a collasped piston.

 

[EagleTalonTim]

Here is a video I did awhile back. Not sure if this is what yours sounds like, but my problem was my timing belt tensioner.

YouTube - Something is just not right!

 

[JTURBOGSX]

when you checked the bearings, did you look at the pistons, you may have a cracked/busted skirt, or a collasped piston.

looking at the pistons only thing I noticed was a small scrapes on the top of the pistons nothing crazy though valves must have been hitting a little... Ugh back to the drawing board

Compression test 2days before came back perfect to

 

[BogusSVO]

you would have had to look at the bottom to look at the piston skirts....

bent valves, you would have a skip miss....

 

[Ajax]

Did you ever figure this out? I am in the same boat with a new motor!

 

[dsmspoolin]

Sounds very similar to the sound I heard when my timing jumped due to the tensioner not installed properly. I didn't bend valves but the timing marks were off. Same description of the sound though. Did you check the timing marks before you took off the head?

 

[400hp93talon]

You need to check for piston slap on the 4th cylinder....If I had to guess my bet would be the wrist pin because that gets loud as #### when it's reved up. That sounds really bad I'm not going to lie to you.

 

[400hp93talon]

Now that I think about it.....it really sounds like a broken valve spring!!!