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     1. 07:26 PM - Lycoming Engine Fuel Flow Problem... (Matt Dralle)
 
 
 

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Time: 
07:26:37 PM PST US
From: 
Matt Dralle <dralle@matronics.com>
Subject: 
Lycoming Engine Fuel Flow Problem...
      
      
      
      Dear Listers,
      
      I flew the RV-6 tonight that has a 1660 hour Lycoming O-360A1A with a Hartzell
      CS prop.  I flew it 7 hours over a 3-day period about a week and a half ago with
      no issues whatsoever.  Tonight, on take off, the EGT's all climbed into the
      1450's right after take off and the CHT's were in the 400-450 range.  The mixture
      was full rich.  The engine didn't seem to be underpowered or rough but the
      fuel flow was about 9-10 GPH when it should have been in the 17-19GPH range.
      On the downwind I tried fiddling with the mixture with no change in making it
      richer.  The mixture did make it leaner.  I switched from the right to the left
      fuel tanks with no change.  I have two fuel flow transducers one feeding the
      Skyview and the other feeding a Matronics FuelChec DX.  Both were reading similarly
      low fuel flows at full throttle - 9-10gph.  I didn't think to flip on
      the electric boost pump.  But the flow definitely seemed restricted.  The mixture
      control seems to have normal throw in and out and isn't binding and does
      lean the engine.  I came in and landed with no issues.
      
      I haven't pulled the cowling yet to have a look to see if its something obvious
      with the mixture cable, but what are some thoughts on what this could be?  
      
      Mechanical Fuel Pump?
      
      Something in the Carb?
      
      Plugged fuel line?
      
      ??
      
      Thanks for your feedback,
      
      Matt
      
      -
      Matt Dralle
      
      RV-8 #82880 N998RV "Ruby Vixen"
      http://www.mattsrv8.com - Matt's Complete RV-8 Construction Log
      http://www.mattsrv8.com/Mishap - Landing Mishap Rebuild Log
      http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
      Status: 260+ Hours TTSN - Version 2.0 Now Flying!
      
      RV-6 #20916 N360EM "The Flyer"
      http://www.mattsrv6.com - Matt's RV-6 Revitalization Log
      Status: 350+ Hours - Full Flyer Mode!
      
      Matt's Livermore Airport Live ATC Stream!
      Check out the live ATC stream directly from my hangar at the Livermore
      Airport.  Includes both Tower and Ground transmissions.  Archives too!
      For entertainment purposes only.  http://klvk.matronics.com
      
      








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