METAL DUST IN EXHAUST

[Booner7M]

hi guys,

I have a 1990 turbo midly-to-highly modified and im getting metal dust coming out of the tail pipe... ive seen that from a broken cat but since I dont have one i was wondering where that could come from... since its light grey dust maybe its coming from the silencer but still its almost direct flow...

i just want to make sure thats no coming from the turbo or anything but since its light grey it dosent seem that its been in a combustion chamber..

any hints?

thnx
david

 

[IJ.]

Check to see if it's magnetic or not

my "guess" if it is it's the turbine wheel rubbing on shutdown.

 

[Booner7M]

It dosent seem magnetic, i checked the ic pipe and there were no residues but there were some dust around the bov exhaust (no sure if its metallic or not). I checked the axial play.. maybe a bit out of the spec but not that bad and the radial play was kinda big (roughly 1mm id say). The fins looked fine... So like you said maybe its the compressor wheel hitting the turbo housing. Do you know how can I make sure this is the problem? I really dont want to damage the engine with that crap..

thnx again

 

[89supturbo]

if its not magneic then i'm going to guess that its fiberglass from a resonator or muffler.

 

[Booner7M]

yeah i hope so.. i noticed a slight change of sound and a vibration coming from the tail pipe

still there are not enough particles to make sure its no magnetic

ill do some dyno runs on wednesday ill check to make sure there is nothing coming out! (i dont want to dmg that nice engine.. its too young )

since im using synthetic oil and because of the oil film that it creates.. do you think that some metal dust would go in the oil and if so would i be able to see it?

peace

 

[Adjuster]

Stick your magnet into your tail pipe and drive around. If there is metal in your exhaust, some will stick to the magnet...

Easy to see.

In my view, if your turbo was putting out so much metal you can see it, it would be not long for the world. (It's more likely the exhaust somehow.)

 

[IJ.]

It dosent seem magnetic, i checked the ic pipe and there were no residues but there were some dust around the bov exhaust (no sure if its metallic or not). I checked the axial play.. maybe a bit out of the spec but not that bad and the radial play was kinda big (roughly 1mm id say). The fins looked fine... So like you said maybe its the compressor wheel hitting the turbo housing. Do you know how can I make sure this is the problem? I really dont want to damage the engine with that crap..

thnx again

If it's on the Intake side it won't be magnetic but it also won't make it through the motor and out the exhaust.

Intake/Compressor wheel is aluminium but both wheels might be rubbing so you might be getting steel dust at the exhaust pipe.

 

[Adjuster]

I'd check the IC pipes then. If you have metal in there, you do have turbo problems. (But again, the turbo should be making some noise I'd think..)

 

[Booner7M]

yeah right (IJ)

I did check the ic pipes and they were all clean and the throttle seemed just fine

i just had a little run and there were no that much of it... so maybe i freaked out too early !!
probably the exhaust (vibrant shit)

thnx for the advices ill keep you guys in toutch with that

see you around