[Diy_efi] Turbine inlet & outlet pressures, housing A/Rs

[Grant Beaty]

Thanks for all your help Greg. Sorry for the stupid questions, I know zilch
about air flow.

Do you think oval tubing might have the same effect? Burn Stainless just
added some to their catalog.

Grant Beaty

----- Original Message -----
From: "Greg Hermann" <bearbvd at mindspring.com>
To: <diy_efi at diy-efi.org>
Sent: Wednesday, January 08, 2003 10:10 AM
Subject: Re: [Diy_efi] Turbine inlet & outlet pressures, housing A/Rs


> At 6:45 PM 1/7/03, Grant Beaty wrote:
> >Any idea where to get a banjo discharge?
> >
> >Thanks,
> >Grant Beaty
>
> I think you''d have to make one. There sure is a picture of a nice one in
> McInnes' book, no clue where it came from.
>
> Might try asking Turbonetics--
>
> Greg
> >
> >----- Original Message -----
> >From: "Greg Hermann" <bearbvd at mindspring.com>
> >To: <diy_efi at diy-efi.org>
> >Sent: Tuesday, January 07, 2003 9:47 AM
> >Subject: Re: [Diy_efi] Turbine inlet & outlet pressures, housing A/Rs
> >
> >
> >> At 3:49 PM 1/6/03, Grant Beaty wrote:
> >> >Oh Greg,
> >> >
> >> >Just saw some old posts of yours in the archives,
> >> >http://www.diy-efi.org/diy_efi/archive/1999-January/msg00237.html
> >> >
> >> >> >I think the REAL unexplored gain is in (more efficient) pressure
> >recovery
> >> >> >from the Mach .75 velocity in the gas spiral at the turbine outlet,
> >> >though.
> >> >> >The circumferential component of the flow in that gas is distinctly
> >> >greater
> >> >> >than the axial component.
> >> >
> >> >Hugh McInnes states that increasing pipe diameter right after the
turbine
> >> >outlet will convert axial flow into turbulent flow. But in your post
you
> >> >don't seem to consider that as an option, instead opting for a banjo
> >> >discharge. Is there any reason for that? Have you tried larger pipes
> >without
> >> >success? Any idea how much larger the pipe needs to be than the
turbine
> >> >inducer?
> >>
> >> A banjo would do an even better job of converting the spiral flow to
> >> straight turbulent (less static pressure loss) than a step in the down
> >> pipe, that's all. I think a step up from the exducer to the down pipe
of
> >> 3/4" to 1" is generally sufficient to shock the flow out of the spiral.
> >>
> >> The more of that static pressure you can recover (less shock loss), the
> >> lower the effective outlet pressure is going to be at the turbine
outlet,
> >> and the less inlet pressure you will need.
> >>
> >> Greg
> >> >
> >> >Forgive my lack of understanding of your post, but are you suggesting
> >that
> >> >exhaust gas velocity post-turbine could be more than doubled by
> >> >straightening the flow? Wouldn't that imply pressures < ambient? Or
would
> >> >total velocity out the turbine decrease, and more would go out the
> >> >wastegate? Either is good, I guess.
> >> >
> >> >Thanks for any help,
> >> >Grant Beaty
> >> >
> >> >----- Original Message -----
> >> >From: "Greg Hermann" <bearbvd at mindspring.com>
> >> >To: <diy_efi at diy-efi.org>
> >> >Sent: Monday, January 06, 2003 10:56 PM
> >> >Subject: Re: [Diy_efi] Turbine inlet & outlet pressures, housing A/Rs
> >> >
> >> >
> >> >> At 7:21 AM 1/6/03, Grant Beaty wrote:
> >> >> >Does anyone know how turbine outlet pressure effect the inlet
> >pressures
> >> >(TIP
> >> >> >& TOP)? Does it work off of a pressure ratio like the compressor,
or
> >is
> >> >it
> >> >> >linear, and increasing TOP by 1 psi results in a 1 psi increase in
> >TIP?
> >> >>
> >> >> Absolute pressure ratio, all the way.
> >> >> >
> >> >> >How about exhaust housing a/rs. Will a larger a/r always produce a
> >lower
> >> >> >TIP,
> >> >>
> >> >> Sure should.
> >> >>
> >> >> Higher EGT at the turbine inlet should require a bit lower pressure
> >ratio
> >> >> across the turbine to get the same shaft power (boost level at a
given
> >> >> engine rpm) out of the compressor.
> >> >>
> >> >> Greg
> >> >> >
> >> >> >Thanks for any help,
> >> >> >Grant Beaty
> >> >>
> >> >>
> >> >>
> >> >> _______________________________________________
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> >> >
> >> >
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> >>
> >>
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