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23-03-2006, 11:07 PM
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#1
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Registered User
Location: Scotland
Interests: Hole maker
Boat make: Humber Ocean Offshore
Engines: KAD 300/DPX
Join Date: Mar 2004
Location: Scotland
Posts: 958
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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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JW.
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24-03-2006, 12:33 AM
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#2
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numbskull
Country: United Kingdom
Location: South
Occupation: none
Interests: none
Boat name: Leviathan
Boat make: Phantom 28
Cruising area: South Coast
Join Date: Mar 2004
Location: South
Posts: 15,959
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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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"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
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24-03-2006, 07:55 AM
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#3
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Senior Member
Country: Finland
Boat name: Wildfire IV
Boat make: Sleekcraft 21 exec jr.
Engines: Chevy 454
Cruising area: Turku Archipelago/ Finnish Gulf
Join Date: Jan 2006
Posts: 245
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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.
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Only issue is that the Turbo might get drained of oil while shutting down.
I find that a marginal issue.
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24-03-2006, 09:53 AM
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#4
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Registered User
Location: Scotland
Interests: Hole maker
Boat make: Humber Ocean Offshore
Engines: KAD 300/DPX
Join Date: Mar 2004
Location: Scotland
Posts: 958
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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.
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Didn't think of that, Jon. Cool.
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JW.
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24-03-2006, 10:46 AM
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#5
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Registered User
Country: uk
Location: Lancaster
Occupation: Ambulance Chaser
Interests: Sailing and going slowly.
Boat make: loser pussycat
Engines: V8
Cruising area: Used to be Windermere!
Join Date: Jan 2006
Location: Lancaster
Posts: 74
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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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24-03-2006, 11:24 AM
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#6
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Senior Member
Country: Finland
Boat name: Wildfire IV
Boat make: Sleekcraft 21 exec jr.
Engines: Chevy 454
Cruising area: Turku Archipelago/ Finnish Gulf
Join Date: Jan 2006
Posts: 245
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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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24-03-2006, 12:35 PM
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#7
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Registered User
Country: uk
Location: Lancaster
Occupation: Ambulance Chaser
Interests: Sailing and going slowly.
Boat make: loser pussycat
Engines: V8
Cruising area: Used to be Windermere!
Join Date: Jan 2006
Location: Lancaster
Posts: 74
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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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26-03-2006, 04:08 PM
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#8
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Senior Member
Country: netherlands
Location: Mijdrecht/holland
Occupation: truck repair
Interests: fast boats/porches
Boat name: bernico cat
Boat make: bernico 26 cat 2x 2,5,s
Engines: merc,s 2,5 EFI,s
Cruising area: ijselmeer
Join Date: Dec 2005
Location: Mijdrecht/holland
Posts: 382
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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.
sterling
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