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Old 23-03-2006, 11:07 PM   #1
jw.
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Turbo Question

Does it matter to a turbo if the oil outflow is at the top? As in the turbo fitted upside down. And, not knowing the oil gallery pattern, can the oil feed be reversed?

Ta.
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Old 24-03-2006, 12:33 AM   #2
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I would think it would matter, yes.
Most turbos mount on the exhaust turbine body, and the centre bearing assy can be rotated within that and also the compressor housing by undoing the pinch bolts & plates, so you could rotate the centre to get it the right way up.

I would think that if you run it upside down, you're likely to get oil finding it's way past the bearings & seals and giving you a smokey motor...could be wrong tho'.

the size of the oil inlet fitting is tiny compared to the spill out pipe underneath, if it cant spill the spent oil quick enough (coz you're using the small hole as the return) the pressure build up would i'm sure lead to burning oil that gets past the bearings & seals
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Old 24-03-2006, 07:55 AM   #3
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Re: Turbo Question

Quote:
Originally posted by jw.
Does it matter to a turbo if the oil outflow is at the top? As in the turbo fitted upside down. And, not knowing the oil gallery pattern, can the oil feed be reversed?

Ta.
Only issue is that the Turbo might get drained of oil while shutting down.
I find that a marginal issue.
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Old 24-03-2006, 09:53 AM   #4
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Thanks for that. They're the kinda thoughts I had too.

Quote:
Most turbos mount on the exhaust turbine body, and the centre bearing assy can be rotated within that and also the compressor housing by undoing the pinch bolts & plates, so you could rotate the centre to get it the right way up.
Didn't think of that, Jon. Cool.
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Old 24-03-2006, 10:46 AM   #5
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If it does drain of oil when shut down that is an issue.

if it is a big turbo, and going on a boat I guess it will be, then it can take a long time to run down and turbos don't have bearings, the shaft "floats" in presurised oil, so no oil is a bad thing. That's why you especially shouldn't rev a turbo motor before switching off.

Just my thoughts, but have had one go on a car and then suck the bits of rotor in - not pretty!
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Old 24-03-2006, 11:24 AM   #6
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The pressure is 25% of the engine oil pressure..actually you can´t call it much of an oil pressure otherwise it would blow oil allower.
And there is a bearing in the Turbo just like in the crankshafts or con rods.
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Old 24-03-2006, 12:35 PM   #7
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Maybe, but shell bearings don't last long with no oil, that's all I'm saying.
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Old 26-03-2006, 04:08 PM   #8
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In most high perf aplications they use a check valve/one way
valve to make sure there is oil at every start.
and when the turbo is hanging down with its core /press line the check valve is higly recommanded.
Later style turbo,s could have ball bearings,these turbo,s spool up quicker and made more power generally.

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