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11-06-2014, 05:32 PM
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Join Date: Jun 2011
Location: Nashua, NH
Posts: 536
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Bendix RSA fuel servo
I have about a 45 GPH flow rate to the servo, but only 6GPH coming out. Yellow tagged, hasn't been run, waiting for plane to be finished (ten years). I checked finger screen and it is clean.
Any guesses?
__________________
Mike
RV-4 #2750
N654ML
IO-360
WW150C Prop
1018 lbs
Flying
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11-06-2014, 05:38 PM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,408
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Mixture lever run both ways-------make sure it is full rich.
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Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010 
Phase 1 done, 2/4/2011
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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11-06-2014, 07:40 PM
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Join Date: Jun 2012
Location: Frederick, MD
Posts: 819
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If you are not running it on the engine it is not sensing airflow and therefore limited fuel on the idle circuit only.
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Dan Morris
Frederick, MD
PA28-140
Hph 304CZ
RV6 built and sold
N199EC RV6A flying
Learn the facts. "Democracy dies in darkness"
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11-06-2014, 08:34 PM
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Join Date: Oct 2005
Location: 08A
Posts: 9,476
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Quote:
Originally Posted by RVDan
If you are not running it on the engine it is not sensing airflow and therefore limited fuel on the idle circuit only.
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Yep. Squirt the throat with some compressed air from a foot or two away, and the flow rate should increase.
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Dan Horton
RV-8 SS
Barrett IO-390
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11-07-2014, 09:08 AM
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Why not finish airplane instead of screwing around with the servo? Unless you have a servo test setup you'll learn nothing. Bendix does advise running fuel to it when mounted to a engine that will not be run for a while. Seals can deteriorate.
Last edited by paul mosher : 11-07-2014 at 09:12 AM.
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11-07-2014, 09:15 AM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,408
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Quote:
Originally Posted by RVDan
If you are not running it on the engine it is not sensing airflow and therefore limited fuel on the idle circuit only.
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Quote:
Originally Posted by DanH
Yep. Squirt the throat with some compressed air from a foot or two away, and the flow rate should increase.
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Exit path for the air flow???
This will create pressure in the intake track, but not flow. Doesn't the servo measure air flow??
__________________
Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010
Phase 1 done, 2/4/2011
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
Last edited by Mike S : 11-07-2014 at 10:18 AM.
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11-07-2014, 09:51 AM
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Join Date: Feb 2005
Location: Minneapolis
Posts: 2,471
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Quote:
Originally Posted by DanH
Yep. Squirt the throat with some compressed air from a foot or two away, and the flow rate should increase.
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Indeed that will work, as will some leaf blowers...but...note some caution in that you don't to blow compressed air directly into the impact tubes - AND - for the flow to increase beyond the idle circuit that you are seeing now you'll need both airflow, the ability for higher fuel flow, as well as the butterfly opened up some amount (for the air to go through the body) and a reasonably accurate fuel flow instrument of some sort.
As others have stated, without a good flow bench or test rig, you don't have much to "test" here or learn other than if it is working at it's basic level or not. Wait until you start the engine, then you'll find out quickly how the idle mixture is set, how the flow is once you're off the idle circuit, etc.. Not easy to do on the bench without more specific tools.
Just my 2 cents as usual.
Cheers,
Stein |
11-07-2014, 05:02 PM
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Join Date: Jun 2011
Location: Nashua, NH
Posts: 536
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Solved
RV Dan and Dan Horton nailed it. Without engine running, that is all the fuel you will get out of it(I spoke with a overhaul shop). Plane is finished, getting ready to start it and awaiting inspection. Picture of it is in RV4 area in "status" section.
__________________
Mike
RV-4 #2750
N654ML
IO-360
WW150C Prop
1018 lbs
Flying
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11-08-2014, 08:24 PM
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Join Date: Jan 2011
Location: Olympia, WA
Posts: 227
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If you are really concerned about it, send it down to Don at Airflow Performance in SC, he's the fuel injection guru and can tell you everything you need to know about yours, will do a complete test for a reasonable price and provide a flow chart as well.
I sent him my complete fuel system (RSA-5) from the servo to the injectors for overhaul, my Lycoming as never started easier or run smoother (hot or cold) than it does now, I am very pleased with their work.
All the best,
Reggie
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12-13-2014, 02:29 PM
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Join Date: Jun 2011
Location: Nashua, NH
Posts: 536
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Ran the engine the other day and it fired up flawlessly. I later did a full power run up and the fuel meter was showing 17gph... can't wait to fly it.
__________________
Mike
RV-4 #2750
N654ML
IO-360
WW150C Prop
1018 lbs
Flying
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