David,
Sorry to
hear about your turbo. Especially
sorry since I have one also. As I
recall though, your turbo was an 86-87, which had a somewhat different
design. When I had mine done, the
core was an 89-91, which was about $200 cheaper. Bryan at BNR turbo told me that the 89-91 was much easier to
upgrade was the reason.
I don't know
if mine will last any longer though. 130 hours of mostly WOT doesn't really sound
all that bad. It will be
interesting to see what went bad on it.
Sounds like it may be the bearings though from the sounds of it.
Regards,
Steve
Brooks
-----Original
Message-----
From: Rotary motors in aircraft
[mailto:
flyrotary@lancaironline.net]
On Behalf
Of David Leonard
Sent: Friday, June 20, 2008 11:47
PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Another Turbo
Bites the dust
Today I flew
from San Diego to Brownville Texas to attend a formation flying clinic.
After 6 hours of WOT flight I was descending through 5000' (down from 15.5k) an
just a few miles from the airport when I had a sudden and sickening drop in
manifold pressure. The engine was still running fine, and I had
plenty of altitude to make the runway, so I continued on debating weather or
not to flip the turbo oil shutoff switch. I had grown to respect this
turbo so much that I finally decided that I had just blown out a fitting
somewhere in the intake system downstream of the turbo. I even continued
on to a low pass for show rather than just landing. When I eventually had
time to take off the cowl I was dissapointed to find that all the fitting were
in place and that the compressor wheel turns only with significant resistance.
So the turbo is dead, and I am out of the formation clinic and will have to
decide tomorrow about flying home with a dead turbo. Will maybe be able
to take a look in the hot side and see what I see.
This turbo was the TO4 hybrid with a fixed wide open waste gate. It had
130 hrs of mostly hard duty. Sigh.
--
David Leonard
Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net
http://RotaryRoster.net