Hi Dan

LOL......... only 1 bar , kids stuff , ...........my bike can pull around
3 bar ( 4: 1 PR) with ITTs of >1400F
http://www.youtube.com/watch?v=P-5PgWqgIJo and it doesn't wreck bearings
,despite only running ordinary automotive lube that also takes care of cooling .

Turbo rotor dynamics are extremely complicated , by the sounds of things these
turbos are in development ..................and still need some more work to get
them sorted :-((

Cheers
John


----- Original Message -----
From: daniel hatfield
To: DIYGasTurbines@yahoogroups.com
Sent: Monday, June 29, 2009 6:53 PM
Subject: Re: [DIYGasTurbines] bearing problem





we are talking about a turbocharger in a drag racer producing boost well above
1 bar that is burning itself out after about 10 to 15 minutes run time (seven
drag runs). it seems to have no cooling of its own.

----- Original Message -----
From: John WALLIS (Racketmotorman)
To: DIYGasTurbines@yahoogroups.com
Sent: Sunday, June 28, 2009 11:33 PM
Subject: Re: [DIYGasTurbines] bearing problem

Hi Dan

Even turbine engine oil shouldn't have "bulk temperatures" of more than ~300
deg F , its only rated to 400 deg F , even though some bearing temps can reach
500 deg F ., but its no good in a turbo with brass bushes whos internal and
external clearances are designed with the engines normal lube viscosity in mind
.

Cheers
John

----- Original Message -----
From: Dan hatfield
To: DIYGasTurbines@yahoogroups.com
Sent: Monday, June 29, 2009 11:18 AM
Subject: RE: [DIYGasTurbines] bearing problem

what do you call "hot"?
here, thin viscosity and high flow rate (30 gallons per minute?) are to
increase cooling

--- On Sun, 6/28/09, Marshall Piper <marshall01@...> wrote:

> From: Marshall Piper <marshall01@...>
> Subject: RE: [DIYGasTurbines] bearing problem
> To: "diygasturbines@yahoogroups.com" <diygasturbines@yahoogroups.com>
> Date: Sunday, June 28, 2009, 5:27 PM
>
> Yes but from my short experience with mobil jet 2 oil i
> wouldn't suggest trying that as the oil really thins out
> when hot i couldn't keep 40 psi when hot but can get over
> 80psi with 5W30 oil when hot . And after going through all
> the hassle of getting a case of the stuff someone told me
> that it is really only good for a bearing type of turbo and
> regular oil was the best .
>
> Marshall
>
>
>
> To: DIYGasTurbines@yahoogroups.com
> From: hatfiedv@...
> Date: Sun, 28 Jun 2009 14:01:38 -0700
> Subject: RE: [DIYGasTurbines] bearing problem
>
>
>
>
>
>
>
> practical? as in 'can it be done?'
> sure, but will he gain anything? no.
> go to www.mcmaster.com to get temperature indicating paint
> stickers. they have dots that melt when their
> temperature is reached. very few bearings of any kind
> will survive more than 200 F. get an electric water
> pump for racing engines, build a oil to water cooling
> system, and push as much oil as possible through that thing
> until you get the temps controllable. all modern cars
> with turbos that have any sort of decent turbo life span
> have seperate cooling systems for the turbo. this
> cooling system has to be as big as the power gained from the
> turbo. if you have a 150hp engine with a good cooling
> system and you get another 150 from the turbo build a
> cooling system as big as the original cooling system.
> put the biggest oil lines on the turbo that the manufacturor
> allows.
>
> if the manufacturor won't let him check out the failures,
> then rest assured that the maker knows what is
> failing. ask them if they allow jet engine oil and use
> synthetic jet oil in the turbo - this stuf is toxic (don't
> allow skin contact) but is good for 5 or 6 hundred degrees.
>
> --- On Sun, 6/28/09, Chris Krug <chris@...>
> wrote:
>
> From: Chris Krug <chris@...>
> Subject: RE: [DIYGasTurbines] bearing problem
> To: DIYGasTurbines@yahoogroups.com
> Date: Sunday, June 28, 2009, 1:23 PM
>
> Hi John,
>
> They’re hydrodynamic bearings.
>
> Dan- Giving the bearings their own cooled oil supply sounds
> like a good
>
> idea.
>
> The class he runs has to use a specific turbo, the people
> who make the
>
> turbo, Precision Turbo, forbid him to look inside the turbo
> to see what’s
>
> wrong, they said they would cut him off if he got caught
> taking one apart. I
>
> know he’s getting that turbo really hot, maybe he’s
> coking it up.
>
> My friend wants to convert the turbo to ball bearings, is
> this practical?
>
> Chris
>
> _____
>
> From: DIYGasTurbines@ yahoogroups. com
> [mailto:DIYGasTurbines@ yahoogroups. com]
>
> On Behalf Of John WALLIS (Racketmotorman)
>
> Sent: Saturday, June 27, 2009 7:49 PM
>
> To: DIYGasTurbines@ yahoogroups. com
>
> Subject: Re: [DIYGasTurbines] bearing problem
>
> Hi Chris
>
> What sort of bearings , brass bushes or balls ??
>
> Cheers
>
> John
>
> ----- Original Message -----
>
> From: Chris Krug
>
> To: DIYGasTurbines@ <mailto:DIYGasTurbi nes%40yahoogroup
> s.com>
>
> yahoogroups. com
>
> Sent: Sunday, June 28, 2009 9:36 AM
>
> Subject: [DIYGasTurbines] bearing problem
>
> A friend of mine runs a small block ford with a 94mm
> Precision Turbo. He
>
> gets 7 runs out of it, while it's blazing fast, almost 200
> mph in the ¼,
>
> he's only getting 7 runs before the bearings in the turbo
> are shot. Any
>
> ideas?
>
> [Non-text portions of this message have been removed]
>
> [Non-text portions of this message have been removed]
>
> [Non-text portions of this message have been removed]
>
>
>
>
>
>
>
>
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
>
>
>
>
>
>
> __________________________________________________________
> Create a cool, new character for your Windows Liveâ„¢
> Messenger.
> http://go.microsoft.com/?linkid=9656621
>
> [Non-text portions of this message have been removed]
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
> mailto:DIYGasTurbines-fullfeatured@yahoogroups.com
>
>
>

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]





[Non-text portions of this message have been removed]