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From: "Steve Brooks" <prvt_pilot@yahoo.com>
To: "'Rotary motors in aircraft'" <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] FW: Turbo failure
Date: Mon, 25 Oct 2004 10:29:41 -0400
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Buly,
I'm interested to know what A/r ratio Brian thinks would be adequate for our
use.

Steve Brooks

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On
Behalf Of Bulent Aliev
Sent: Sunday, October 24, 2004 5:29 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] FW: Turbo failure


"Brian D. Cain" wrote:
>
> I've been reading this thread off and on and I'd like to give my input on
> it.
>
> Being from the automotive arena, I've got alot of practical, in-car
> experience with the
> use of the two stock turbochargers (both the earlier 87-88 unit and the
> 89-91 unit) and
> I must say that they absolutely stink!  The turbine housing is too small
in
> my opinion for
> the breathability of the engine, even a stock engine with no modifications
> done to it.  It
> runs far too hot.  I also believe it can cause alot of backpressure past
the
> point of about
> 8psi of positive manifold pressure.  Some may disagree, but I believe this
> turbo isn't
> as well suited to the 13B as are some alternatives.
>
> One of these alternatives is the Borg Warner (Schwitzer) TO4B
"replacement"
> turbo
> that is sold as a generic T4 turbocharger to the public.  The part # is
> 313102.  Although
> I believe it comes with a turbine housing that has too large of an A/R
> ratio, I believe it
> would be very well suited for you guys.  It is larger than the stock unit
> but not substantially.
> Since it is a larger shaft unit w/ larger exhaust housing and compressor
> setup, I believe it
> will produce the same power you guys desire for take-off and climbing
let's
> say, at a
> lower positive boost pressure, with far less heat.  If there's one thing I
> have learned about
> rotaries in all of my years of working on these and blowing them up, it's
> that the exhaust
> system needs to be atleast 100% efficient as the intake system is.  This
> includes the sizing
> of the turbocharger's turbine housing specifically in this case.
> Comparatively to piston
> engine setups, our engines demand the use of a large turbine housing to
keep
> exhaust
> backpressure low as well as velocities high.
>
> This turbo is cheap (about $450 brand new) although it would probably
> require a
> slightly smaller A/R ratio turbine housing with the proper exhaust flange
> welded on it.
> This turbo also has a dry bearing housing (meaning it does not use coolant
> lines).  Tapped
> for 1/4"NPT on the oil feed side.  This is a moderately sized turbocharger
> but not too
> big for the application in my opinion.  Definitely worth a try!
>
> Once I get some pictures of this 313102 TO4B unit taken here, I will post
> the link.
>
> B
> __________________
> Brian D. Cain -/- Grand Prairie, TX -/- bdc196@killspam.comcast.net
> bdc@killspam.teamfc3s.org
> BDC Motorsports - Performance 13B Engines, Haltech EFI tuning, Etc.
> MSN bdc196@killspam.hotmail.com, Yahoo! bdc196, AOL Symajhi, ICQ# 1733105
> http://bdc.cyberosity.com -/-
http://groups.yahoo.com/group/HaltechSupport--


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