Paul, if you haven't already, check the hose clamp connection of the airbox
hoses to the carburetor. These hoses have a way of vibrating themselves
loose from the carburetor, thus causing the "boost" from the turbo to be
vented to the outside atmosphere. It happened to me 4 or 5 times until I
safety wired the airbox to the carburetors.
Garry Stout
----- Original Message -----
From: "Paul McAllister" <paul.the.aviator@gmail.com>
Sent: Thursday, December 27, 2007 8:34 PM
Subject: Europa-List: Trouble Shooting Turbo Issue
> <paul.the.aviator@gmail.com>
>
> Hi all,
>
> I am looking for some ideas on a problem with my 914T. I had the
> carburettors overhauled by Lockwood aviation and after reassembling it
> I have a new problem.
>
> I can get 34" of boost at 100% throttle setting on take off at 1000'
> msl, but when I climb the maximum boost available decreases with
> altitude. For example I get about 27" at 8,500', and 24" and 12,500.
>
> So far I have checked the following:
>
> - Reseated / checked the TCU cable connections to the air box
> - Checked for leaks / tightness on the carburettors
> - Checked to see if the waste gate cycles properly when the TCU is turned
> on
> - Calibrated the throttle positions on the TCU with my laptop
>
> I haven't disconnected to cable to the waste gate yet to check if I
> can get full movement on the waste gate because its way too cold to
> work in the hanger.
>
> The next time the weather permits flying I was thinking of connecting
> my laptop to the TCU and see what the parameters are saying. For
> example if the air box temperature sensor is faulty the TCU might
> interpret this as over temp and not allow the waste gate to close.
>
> Anyhow, I would appreciate ideas on this. It may be that the
> carburettor overhaul is unrelated, but I thought I'd mention it
> because it was what had been changed in recent times.
>
> Regards, Paul
>
>
>
|