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Where Do I Install The Fuel Flow Transducer

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BCROSS

Joined: 10 May 2009
Posts: 5
Location: Brampton, Ontario

Posted: Sat Jun 20, 2009 6:37 am Post subject: Where Do I Install The Fuel Flow Transducer

Hi Folks



I am working on the installation of the of the fuel flow transducer 

on my angle valve Lycoming.  I have the standard EI FT-60 red cube 

which I purchased through

Advanced Flight Systems.  I am struggling as to where is the best 

location to mount this unit.



Their manual suggests 3 locations, (page 59);



1/  The transducer may be mounted in a stationary position in line 

between the electric boost pump and the engine driven pump.



2/  The transducer may be mounted in a stationary position in line 

between the fuel injection servo and the distribution block, aka, spider.



3/  The transducer may be mounted in a stationary position in line 

between the engine driven pump and the carburetor, I assume this 

could also mean the fuel injection servo.



My thoughts:



Option 1/  On the RV-8, there is a lot of unused room in the left 

footwell area & could easily be mounted on the output of the electric 

pump aft of the firewall.  Lots of room, cool area, good environment 

for the transducer.  Can easily put the 5" of straight line before & 

after the unit as per their instructions.  Electrical wiring would 

not have to go through the firewall. Down side in my mind is that 

there is an orifice of about 5/32" in order to direct the fuel flow 

at the paddle wheel.  During normal operations, the mechanical fuel 

pump would have to suck through that rather small orifice in a 3/8" 

fuel line.  Problem?  I am not sure.



Option 2/  I have seen that mounted basically between cylinders # 1 & 

# 3.  Possibly hand it directly from the spider itself & would make a 

reasonably neat installation.  Downside:  Pretty hot area especially 

right after shutdown - not an ideal environment for the 

transducer.  Quite a bit of vibration there of course & 2 joints 

would be added i.e the hose would have to be split here.  5" of 

straight line before & after would be difficult & would actually put 

the unit almost dead centre between the cylinders.  Option 2 & 3 

would put the unit on the pressure side of the mechanical or the 

electrical pump at all times easing my small orifice concern.



Option 3/  Still in a hot area but not as bad as Option 2 assuming 

heat shields around the exhaust pipe is used.  5" straight rule would 

be replaced by 5" of gently curving lines.  Not as nice an 

environment obviously as Option 1.

Sure would like some opinions on this one.  Sorry about the detail.



Thanks very much.

Brian Cross

RV-8

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rick.mcbride(at)me.com
Guest

Posted: Sat Jun 20, 2009 7:13 am Post subject: Where Do I Install The Fuel Flow Transducer

Brian,



I have mine mounted in the option 3 location on my RV-8's angle valve  

IO360.  I have 460 hours on the airplane and the transducer has worked  

well and provides accurate readings.  I wrapped the transducer in fire  

sleeve and then wrapped that in metal tape.  That may be overkill but  

so far so good.  But who knows, tomorrow it could crap out.



Rick McBride



On Jun 20, 2009, at 10:35 AM, Brian Cross wrote:



 	  Quote: 	
		   



 Hi Folks



 I am working on the installation of the of the fuel flow transducer  

 on my angle valve Lycoming.  I have the standard EI FT-60 red cube  

 which I purchased through

 Advanced Flight Systems.  I am struggling as to where is the best  

 location to mount this unit.



 Their manual suggests 3 locations, (page 59);



 1/  The transducer may be mounted in a stationary position in line  

 between the electric boost pump and the engine driven pump.



 2/  The transducer may be mounted in a stationary position in line  

 between the fuel injection servo and the distribution block, aka,  

 spider.



 3/  The transducer may be mounted in a stationary position in line  

 between the engine driven pump and the carburetor, I assume this  

 could also mean the fuel injection servo.



 My thoughts:



 Option 1/  On the RV-8, there is a lot of unused room in the left  

 footwell area & could easily be mounted on the output of the  

 electric pump aft of the firewall.  Lots of room, cool area, good  

 environment for the transducer.  Can easily put the 5" of straight  

 line before & after the unit as per their instructions.  Electrical  

 wiring would not have to go through the firewall. Down side in my  

 mind is that there is an orifice of about 5/32" in order to direct  

 the fuel flow at the paddle wheel.  During normal operations, the  

 mechanical fuel pump would have to suck through that rather small  

 orifice in a 3/8" fuel line.  Problem?  I am not sure.



 Option 2/  I have seen that mounted basically between cylinders # 1  

 & # 3.  Possibly hand it directly from the spider itself & would  

 make a reasonably neat installation.  Downside:  Pretty hot area  

 especially right after shutdown - not an ideal environment for the  

 transducer.  Quite a bit of vibration there of course & 2 joints  

 would be added i.e the hose would have to be split here.  5" of  

 straight line before & after would be difficult & would actually put  

 the unit almost dead centre between the cylinders.  Option 2 & 3  

 would put the unit on the pressure side of the mechanical or the  

 electrical pump at all times easing my small orifice concern.



 Option 3/  Still in a hot area but not as bad as Option 2 assuming  

 heat shields around the exhaust pipe is used.  5" straight rule  

 would be replaced by 5" of gently curving lines.  Not as nice an  

 environment obviously as Option 1.

 Sure would like some opinions on this one.  Sorry about the detail.



 Thanks very much.

 Brian Cross

 RV-8

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carl.froehlich(at)verizon
Guest

Posted: Sat Jun 20, 2009 7:25 am Post subject: Where Do I Install The Fuel Flow Transducer

I did option #2 on my 8A.  To mitigate the heat issue I put fire sleeve over

the transducer - extending a few inches beyond the transducer in both

directions.  The fire sleeve also provided a cushion to bundle the now

transducer/fuel line to spider assembly to other runs under the right

cylinders (alternator lead also in fire sleeve, etc.).  The hose from the

spider to the transducer is long enough to make a slow curve such that the

transducer inlet and outlet ports are horizontal.  This way the transducer

is not hanging on the spider (I did not like the mechanical issue for that),

and it enabled a reasonably smooth if not straight sections of hose for the

transducer.  I find the fuel flow accuracy to be consistently within a

fraction of a gallon when filling the tanks.  500 hrs on the engine and all

is well.



I have seen other installs such as the transducer on the firewall and these

seem to work as well.  For the RV-10 the transducer in mounted on the cabin

side of the firewall just after the boost pump.  I do not have personal

experience with this but some RV-10 projects report fuel flow changes

with/without boost pump, etc.  Considering the simplicity of this install

option however I plan on the same place for my RV-10.



Carl Froehlich

RV-8A

RV-10 (fuselage)



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