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Dave,
Stating the obvious, that sucks. I assume you
run synthetic oil? Is the center housing water cooled?
Mike Wills
RV-4 N144MW
----- Original Message -----
Sent: Friday, June 20, 2008 8:47 PM
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
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