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fuel flow transducer location

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wroe1(at)dbtech.net
Guest

Posted: Tue Sep 15, 2009 1:47 pm Post subject: fuel flow transducer location

Does anyone have a recommendation as to the location of a fuel flow transducer?  I’m building an RV-7 and see two potential options for positioning this AFS transducer:    between the boost pump and the firewall, or  
Between the injection servo and the distribution spider.   

   

Any comments would be appreciated.  Thanks!  

     

Wade  Roe  

RV-7 in progress  

Aeronca Champ flying  

Tuscaloosa, AL  

   

  

       [quote][b]

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frank.hinde(at)hp.com
Guest

Posted: Tue Sep 15, 2009 2:20 pm Post subject: fuel flow transducer location

Between boost pump and the firewall is the most perfect  spot. Try to maintian a straight section of pipe (10 pipe diameter's in front  and 5 diameter's behind I believe). If you can't manage that it seems the unit  can be calibrated pretty accurately anyway. I have known some builders put the  flow pransducer on a 90 degree elbow and it still calibrates just  fine.

  

 The cabin is cooler, less vibration (at least compared to  the engine itself) and these units almost never go wrong so burying it under the  cover is entirely satisfactory.

  

 Frank

 7a 400 and something hours



   From:  owner-aeroelectric-list-server(at)matronics.com  [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Wade  Roe

Sent: Tuesday, September 15, 2009 2:07 PM

To:  aeroelectric-list(at)matronics.com

Subject: fuel flow  transducer location

 

  

Does anyone have a  recommendation as to the location of a fuel flow transducer?  I’m building an RV-7 and see two  potential options for positioning this AFS  transducer:    between the boost pump and the    firewall, or    
Between the injection servo and    the distribution spider.  

  

Any comments would be  appreciated.   Thanks! 

   

Wade  Roe 

RV-7  in progress 

Aeronca  Champ flying 

Tuscaloosa,  AL 

 



[quote]



ist">http://www.matronics.com/Navigator?AeroElectric-List

ics.com

.matronics.com/contribution



[b]

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kahuna

Joined: 02 Feb 2007
Posts: 93

Posted: Tue Sep 15, 2009 2:21 pm Post subject: fuel flow transducer location

The latter will be more accurate.

 The closer to the injectors, the better.

 Further away will give you less accurate readings particularly with/without boost pump on.

 Seems odd I know. Flow is flow. But the pressure changes affect readings even if the little turbine wheel in the transducer is still spinning at the same speed.

 Mike

 

 

 

 [img]cid:1__=08BBFCA1DFEA76AB8f9e8a93df938(at)us.ibm.com[/img]"Wade Roe" ---09/15/2009 06:09:55 PM---Does anyone have a recommendation as to the location of a fuel flow transducer?  I'm building an RV-

 

   [img]cid:2__=08BBFCA1DFEA76AB8f9e8a93df938(at)us.ibm.com[/img]

 From:[img]cid:2__=08BBFCA1DFEA76AB8f9e8a93df938(at)us.ibm.com[/img]

 "Wade Roe" <wroe1(at)dbtech.net>  [img]cid:2__=08BBFCA1DFEA76AB8f9e8a93df938(at)us.ibm.com[/img]

 To:[img]cid:2__=08BBFCA1DFEA76AB8f9e8a93df938(at)us.ibm.com[/img]

 <aeroelectric-list(at)matronics.com>  [img]cid:2__=08BBFCA1DFEA76AB8f9e8a93df938(at)us.ibm.com[/img]

 Date:[img]cid:2__=08BBFCA1DFEA76AB8f9e8a93df938(at)us.ibm.com[/img]

 09/15/2009 06:09 PM  [img]cid:2__=08BBFCA1DFEA76AB8f9e8a93df938(at)us.ibm.com[/img]

 Subject:[img]cid:2__=08BBFCA1DFEA76AB8f9e8a93df938(at)us.ibm.com[/img]

 AeroElectric-List: fuel flow transducer location  [img]cid:2__=08BBFCA1DFEA76AB8f9e8a93df938(at)us.ibm.com[/img]

 Sent by:[img]cid:2__=08BBFCA1DFEA76AB8f9e8a93df938(at)us.ibm.com[/img]

 owner-aeroelectric-list-server(at)matronics.com  

 

 

 Does anyone have a recommendation as to the location of a fuel flow transducer?  I’m building an RV-7 and see two potential options for positioning this AFS transducer:   between the boost pump and the firewall, or 
Between the injection servo and the distribution spider.
    

Any comments would be appreciated.  Thanks! 

  

Wade Roe 

RV-7 in progress 

Aeronca Champ flying 

Tuscaloosa, AL 

 

 [b]

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al38kit

Joined: 13 Jul 2009
Posts: 21

Posted: Thu Sep 17, 2009 5:20 am Post subject: Re: fuel flow transducer location

I have used them in both locations with equal success.



Now I have one mounted on the engine case after the transducer...this is on a Lycoming installation.



On the Continental, it is the only place that you will get an accurate flow, as they use a return line from the servo to the tank.



Another thing that Flowscan recommends beside the lines being straight, is to mount the transducer with the wires pointing up.



I have installed them with a 90 degree fitting on the out side and it has worked fine.



Al

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