What causes a turbo shaft to break?
03-20-2005, 02:21 PM
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What causes a turbo shaft to break?
I've never seen this before on a street car running moderate boost levels. GSR, built engine, 13psi with a t3/60-1 bb S comp cover turbo. 1200 miles on the turbocharger, started smoking a little about week ago, changed fuel pump so strapped it on the dyno last night for a retune. Three passes in, its smoking worse than ive ever seen, right before we shut it down, lots of noise from the engine bay. I got the manifold and piping off to assess the damage and the turbo wheels will spin independently of each other, turbine wheel moves as far as the housing will let it, just rattles around. I'll try to get a video up.
03-21-2005, 10:36 AM
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Re: What causes a turbo shaft to break? (Jared)
that happend to me but with a t25.... how is your oil return line? ours happened cuz of some really ghetto oil lines that starved the turbo of oil.
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03-21-2005, 12:05 PM
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Re: What causes a turbo shaft to break? (sporkcrx)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sporkcrx »</TD></TR><TR><TD CLASS="quote">Hollow shaft or solid?</TD></TR></TABLE>
not sure, havent disassembled yet
not sure, havent disassembled yet
03-21-2005, 12:06 PM
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Re: What causes a turbo shaft to break? (Jared)
oil return is fine, -10, as is the feed, -3. the bearing still feels ok because the compressor wheel side of the shaft is still held by the bearing, which feels great and has minimal play, like it broke just behind the exhaust wheel but not up to the bearing. very odd.
03-21-2005, 12:27 PM
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Re: What causes a turbo shaft to break? (Jared)
What kind of oil are you using? Cheap mineral oil will boil near the the turbine housing causing temporary oil starvation. Take the whole thing apart and check the bearings, the seals too. If the bearing's fine then I'd say look at the area behind the turbine and see if the surface made any contact with the wheel.
03-21-2005, 07:04 PM
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Re: What causes a turbo shaft to break? (H22A_NeThing)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by H22A_NeThing »</TD></TR><TR><TD CLASS="quote">What kind of oil are you using? Cheap mineral oil will boil near the the turbine housing causing temporary oil starvation. Take the whole thing apart and check the bearings, the seals too. If the bearing's fine then I'd say look at the area behind the turbine and see if the surface made any contact with the wheel.</TD></TR></TABLE>
Using Pennzoil 10-30 in the engine. Haven't disassembled yet.
Using Pennzoil 10-30 in the engine. Haven't disassembled yet.
03-21-2005, 07:21 PM
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Re: What causes a turbo shaft to break? (PrettyLude)
what does psi have to do with the shaft breaking in a 14b? maybe their oil feed was fucked up or something, cuz that is what primarily causes this to happen as mentioned above.
03-22-2005, 05:55 AM
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Re: (tony1)
Too much shaft rpm will do it, we broke a 71mm turbo this weekend on Chuck's car from running 45psi. lol >>>>
There,there....nothing to be ashamed of.. it could have broke at "only" 40 psi lol
There,there....nothing to be ashamed of.. it could have broke at "only" 40 psi lol
03-22-2005, 07:16 AM
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Re: What causes a turbo shaft to break? (H22A_NeThing)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by H22A_NeThing »</TD></TR><TR><TD CLASS="quote"> Take the whole thing apart and check the bearings, the seals too. If the bearing's fine then I'd say look at the area behind the turbine and see if the surface made any contact with the wheel.</TD></TR></TABLE>word. seals go bad. then the oil can cake up = starvation. then the heat or friction can kill it. same thing on my t25. 
03-24-2005, 12:52 PM
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Re: (PrettyLude)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PrettyLude »</TD></TR><TR><TD CLASS="quote">because it is way out of its efficiency range therefore producing extremely hot air</TD></TR></TABLE>
this is half correct, if you overspeed a turbo it "surges" causing air to back up in the intake which causes the pressure to act against the turbine and a sudden change like that could easily snap a shaft......how old was the 14b? rebuilt?
this is half correct, if you overspeed a turbo it "surges" causing air to back up in the intake which causes the pressure to act against the turbine and a sudden change like that could easily snap a shaft......how old was the 14b? rebuilt?
03-24-2005, 03:03 PM
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Re: (H22A_NeThing)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by H22A_NeThing »</TD></TR><TR><TD CLASS="quote">
this is half correct, if you overspeed a turbo it "surges" causing air to back up in the intake which causes the pressure to act against the turbine and a sudden change like that could easily snap a shaft......how old was the 14b? rebuilt?</TD></TR></TABLE>
i really dont think that mike was over working the charger by no means
this is half correct, if you overspeed a turbo it "surges" causing air to back up in the intake which causes the pressure to act against the turbine and a sudden change like that could easily snap a shaft......how old was the 14b? rebuilt?</TD></TR></TABLE>
i really dont think that mike was over working the charger by no means
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