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John,
I had about 60 hours on the stock turbo, when I sent it off to be rebuilt. It was still running good, but I figured that I was on borrowed time. With the turbo, my cooling has never been really great, unless the OAT was 40 degrees or so. After the turbo upgrade it became even worse, so I'm in the process of rebuilding my cooling system.
When Bryan rebuilt my turbo, I had him completely remove the waste gate. I still get plenty of boost.
Steve Brooks
-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On Behalf Of John Overman
Sent: Saturday, June 21, 2008 4:43 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Another Turbo Bites the dust
Steve
I also have one of Bryan's upgrades. I'm not flying yet but I'm leaving the "actuator" installed and plan to control it with a control cable from the panel. In the off position that will cut off the exhaust to one of the two turbine wheels. Since I will be mostly turbo-normalizing I think it will be pretty hard to overtax the turbo.
--- On Sat, 6/21/08, Steve Brooks <cozy4pilot@gmail.com> wrote:
From: Steve Brooks <cozy4pilot@gmail.com>
Subject: [FlyRotary] Re: Another Turbo Bites the dust
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Date: Saturday, June 21, 2008, 1:20 PM
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
--
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