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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

PostPosted: Sat Jun 20, 2009 6:37 am    Post subject: Where Do I Install The Fuel Flow Transducer Reply with 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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rick.mcbride(at)me.com
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PostPosted: Sat Jun 20, 2009 7:13 am    Post subject: Where Do I Install The Fuel Flow Transducer Reply with quote

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
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PostPosted: Sat Jun 20, 2009 7:25 am    Post subject: Where Do I Install The Fuel Flow Transducer Reply with quote

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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