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+--- Thread: is this turbo junk? (/showthread.php?tid=1232)
is this turbo junk? - JB3 - 03-22-2010
Turbo experts-
There is no play in the shaft, but there looks like some damage, what is the verdict?
RE: is this turbo junk? - Nick - 03-22-2010
the blade in the 2'o clock position looks pretty worn. i'd bet it was run without a filter for some time.
with that much wear i'd be concerned about balance. the bearings life may be compromised because of any vibration, and could lead to premature failure.
now im good with the physics of turbochargers, i know how they work, but i don't have much long-term experience so let 'forced or someone else back me up on this.
RE: is this turbo junk? - Rudolf_Diesel - 03-22-2010
Get rid of it and buy my t3/t4
RE: is this turbo junk? - Kiwibacon - 03-22-2010
It's far from dead, but even that little damage will make it run less efficiently so the air out is hotter.
It takes a huge amount of damage to unbalance a wheel, no problems there.
RE: is this turbo junk? - JB3 - 03-22-2010
Ive got two of them about the same level of erosion, figure ill put the least rusted one in service for the moment then.
Love to buy a T3/T4, but I have managed to dig a pit and pile a mountain of broken and non functional auto parts in on top of me! When I resurface, maybe you will still have it for sale!
RE: is this turbo junk? - ForcedInduction - 03-22-2010
Looks like its rubbibg the housing. Take off the housing and check.
RE: is this turbo junk? - Paperjam - 03-29-2010
it actually wont take much to unbalance a turbo, something as simple as not clocking the wheels correctly when re assembling a turbo can cause imbalance. when the Compressor and turbine wheels spin at 100,000 rpm, balance is important. If its touching the housing AT ALL, it will fail muuuch faster. also, check the play In and out, which is more important than side to side.
RE: is this turbo junk? - Kiwibacon - 03-29-2010
(03-29-2010, 01:25 AM)Paperjam it actually wont take much to unbalance a turbo, something as simple as not clocking the wheels correctly when re assembling a turbo can cause imbalance. when the Compressor and turbine wheels spin at 100,000 rpm, balance is important. If its touching the housing AT ALL, it will fail muuuch faster. also, check the play In and out, which is more important than side to side.
Having the wheels not clocked cannot kill an otherwise healthy turbo. I've swapped compressor wheels several times and never had a balance issue. Remember all these parts are individually balanced, the remaining stack-up imbalance is tiny.
You have to have worn out bushings to rub the housing. Worn out bushings don't happen if the oil supply is good and the wheels still have all their fins. It takes a lack of oil pressure and/or severely damaged shaft/wheels to do that.
RE: is this turbo junk? - ForcedInduction - 03-29-2010
The parts are balanced individually on 99% of factory turbos. Its easy to tell if the assembly is match balanced, the compressor nut will have material cut off of one side. If the nut is whole you can swap wheels without worry of keeping alignment or the need to rebalance.
RE: is this turbo junk? - Kiwibacon - 03-29-2010
(03-29-2010, 10:13 AM)ForcedInduction The parts are balanced individually on 99% of factory turbos. Its easy to tell if the assembly is match balanced, the compressor nut will have material cut off of one side. If the nut is whole you can swap wheels without worry of keeping alignment or the need to rebalance.
The "nut cut" is for residual or stack-up balance, all of the parts are still individually balanced.
The turbos I've swapped wheels on all had trimmed compressor nuts. Because the compressor nut is the closest part to the turbo axis it's the part that has the least effect on balance. You can carve a lot off a lot and it does nothing compared to the same material removal on the wheel rim 25-30mm further out.