John Slade had his turbo reconfigured by Leon Promet in AUS,
http://www.turbonetics.com.au/
but have not flown it yet. The web site explains what he does. I
wander
if
somebody can do that here?
Bulent
Bulent,
I wouldn't hold great hope for Leon's opinion, admittedly he has a
lot of
knowledge in the Auto application, but from my experience he relies
heavily
on the local turbo experts - who have no experience in Aircraft
application.
I wish I could say he does have the knowledge and the skills, sadly
that's
not the case.
George (down under)
George, you may be right, I don't know him? Someone better come with
solution fast :). I'm sitting on the fence with freshly rebuilt stock
turbo
and not knowing which way to turn? I see some reasonably priced TO4
torbos
on Ebay and may try one of them?
Bulent
I think it will work Bulent if you don't ask too much from it. I would
start
by porting the waste gate for sure. After thinking about it a bit
porting and
polishing the interior of the exhaust scroll might also help. If high
performance
is real important to you go with the TO4.
Paul Lamar
Here is my suggestions on porting the waste gate Bulent.
Plus and air cooled exhaust manifold to knock 100 F or so off the air temp
going in. Every little bit helps.
BTW Inconel is only good for 100 to 150 F higher EGT.
Paul Lamar
"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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