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12-26-2011, 02:59 PM
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Join Date: Nov 2010
Location: lake charles, La.
Posts: 699
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Fuel flow sensor question
Thinking about putting a dynon flightdek 180 in my -8 and was wondering about a fuel flow transducer. Some research showed to mount it in between engine fuel pump and carburetor. I would prefer to mount it right after the electric backup fuel pump that is mounted in the standard location. Does anyone know why that would not be a good location? To me keeping it away from engine heat and vibration would be good. I saw a mention about accuracy but don't understand how the accuracy could be different. One fuel line, flow should be same everywhere? thanks
bird
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Bird
rv8 entire airframe at airport now, painting done, intersection and gear upper and lower fairings done, maybe order engine around first of year or before the next rate increase.
"to fly is a privilege that I am so thankful to God for"
http://www.mykitlog.com/tcb328/
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12-26-2011, 03:10 PM
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Join Date: Apr 2005
Location: KSLC
Posts: 4,021
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A lot of fuel flow sensors have been mounted just past the aux fuel pump. Mine is (RV6), and no problem. I did mount a fuel filter in the lines coming from each tank to the fuel tank valve.
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12-26-2011, 03:34 PM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,668
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Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
Last edited by Walt : 12-26-2011 at 04:12 PM.
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12-26-2011, 03:36 PM
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VAF Moderator / Line Boy
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Join Date: Jan 2005
Location: Dayton, NV
Posts: 12,247
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That is a very common locaitonin RV-8's, for the reasons that you cite. Just be aware that you will, however, otice an increase in indicated fuel flow af about 1-2 gph when the Aux pump is turned on. Since you usually don't have it on for very long, this isn't a big deal, and the totalizer will always show just a little less fuel than you actually have - which is an error in the "safe" direction.
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Paul F. Dye
Editor at Large - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
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Dayton Valley Airpark (A34)
http://Ironflight.com
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12-27-2011, 03:39 PM
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Join Date: Nov 2010
Location: lake charles, La.
Posts: 699
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one more question
We have flow transducers at work that don't have any restriction or turbines in them. If I can find something like that, I wouldn't think that another filter would be necessary. Just the gascolator that I am planning on putting on the firewall. thanks
bird
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Bird
rv8 entire airframe at airport now, painting done, intersection and gear upper and lower fairings done, maybe order engine around first of year or before the next rate increase.
"to fly is a privilege that I am so thankful to God for"
http://www.mykitlog.com/tcb328/
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12-27-2011, 06:32 PM
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Join Date: Apr 2009
Location: USA
Posts: 1,499
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My red cube is installed in tunnel just forward of boost pump in Van's specified location. Every single fillup is within 0.5 gallons. If I add 30 gal my efis will say I used 30.5 Gal. My tunnel stays cool but the transducer is still exposed to vibration.
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Good judgment comes from experience, and a lot of that comes from bad judgment.
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12-27-2011, 06:59 PM
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Join Date: May 2008
Location: Brisbane Qld. Aust.
Posts: 2,271
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Bird
They are most likely a Caliometric flow sensor, and not suitable for this application. Their accuracy range is most likely in higer volumes per minute.
For the record we have the original dynon flow sensor, and it is accurate to within 0.5L - 1.0L per tank load over 200L. That is a 1/4 gallon or less for our non metric friends!  |
12-28-2011, 12:43 PM
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Join Date: Oct 2009
Location: Fort Myers
Posts: 370
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I originally had mounted in that location but had inaccuracy issues. Any time the boost pump was on it would go up about 2 gph. It also fluctuated in flight but averaged reasonably well. I moved it between pump and carb and I now get an accurate, steady reading at all times.
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12-28-2011, 03:01 PM
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Join Date: Nov 2010
Location: lake charles, La.
Posts: 699
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cool
Thanks flybuddy and everyone else for the imputs. I haven't made a decision yet but working on it. thanks again
bird
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Bird
rv8 entire airframe at airport now, painting done, intersection and gear upper and lower fairings done, maybe order engine around first of year or before the next rate increase.
"to fly is a privilege that I am so thankful to God for"
http://www.mykitlog.com/tcb328/
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12-28-2011, 03:03 PM
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Join Date: Nov 2010
Location: lake charles, La.
Posts: 699
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cool
Thanks flybuddy and everyone else for the imputs. I haven't made a decision yet but working on it. Two things I'm kinda hung on. 1. Im not crazy about having another filter in my system besides a gascolator. 2. I am concerned about fuel leaks in engine compartment, maybe more than I should be. Feel free to enlighten me on these two subjects.
thanks again
bird
__________________
Bird
rv8 entire airframe at airport now, painting done, intersection and gear upper and lower fairings done, maybe order engine around first of year or before the next rate increase.
"to fly is a privilege that I am so thankful to God for"
http://www.mykitlog.com/tcb328/
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