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914 Turbo boost

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l_luv2_fly(at)yahoo.com
Guest

Posted: Thu Dec 27, 2007 7:38 am Post subject: 914 Turbo boost

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



    [quote][b]

- The Matronics RotaxEngines-List Email Forum -

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JOE RONCO

Joined: 04 Aug 2007
Posts: 31
Location: CENTENNIAL COLORADO

Posted: Thu Dec 27, 2007 10:18 am Post subject: 914 Turbo boost

I don’t know much about turbo charging but the articles in the following link might help.  

   

http://www.kellyaerospace.com/articles/Turbocharging.pdf   

   

Joe R  

       

From: owner-rotaxengines-list-server(at)matronics.com [mailto:owner-rotaxengines-list-server(at)matronics.com] On Behalf Of Paul McAllister

 Sent: Thursday, December 27, 2007 7:59 AM

 To: rotaxengines-list(at)matronics.com

 Subject: 914 Turbo boost  

  

  

       

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  

  

  

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        [quote][b]

- The Matronics RotaxEngines-List Email Forum -

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