RV-List Digest Archive

Tue 12/22/15


Total Messages Posted: 2



Today's Message Index:
----------------------
 
     1. 12:20 PM - Re: Lycoming O-360 Fuel Flow Rate  (Matt Dralle)
     2. 02:17 PM - Re: Re: Lycoming O-360 Fuel Flow Rate (vanremog@aol.com)
 
 
 


Message 1


  • INDEX
  • Back to Main INDEX
  • NEXT
  • Skip to NEXT Message
  • LIST
  • Reply to LIST Regarding this Message
  • SENDER
  • Reply to SENDER Regarding this Message
    Time: 12:20:10 PM PST US
    From: Matt Dralle <dralle@matronics.com>
    Subject: Re: Lycoming O-360 Fuel Flow Rate
    Well, it was probably the fuel pump. I think my flow rates right after replacing the fuel pump (but before I replaced the carb) were probably alright as they were similar to what I saw after the new carb. But, it was time for a new carb anyway, so I guess it worked out. Btw, as if all of this debacle wasn't frustrating enough, last weekend while trying to test all of this, the battery went dead. Checking the logs it was 36 months ago since I replaced it the last time. Guess that's about right. Sigh. Is it time to fly it yet? I've been working on it enough lately. ;-) 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: 210+ Hours TTSN - Version 2.0 Now Flying! RV-6 #20916 N360EM "The Flyer" http://www.mattsrv6.com - Matt's RV-6 Revitalization Log Status: 300+ 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. At 10:24 AM 12/21/2015 Monday, you wrote: >So what did you do to fix the problem Matt? > >Harry Crosby > > >---------- >From: "Matt Dralle" <dralle@matronics.com> >To: "RV-List" <rv-list@matronics.com>, LycomingEngines-list@matronics.com, rv6-list@matronics.com, rv10-list@matronics.com >Sent: Saturday, December 19, 2015 12:44:41 PM >Subject: RV-List: Re: Lycoming O-360 Fuel Flow Rate > > >Thank you to everyone that responded!! There were some great comments that got me going down the right path. > >Last night I got the cowling back on and took the RV-6 out on the runway and ran it up to full power with the intent of carefully watching the flow rate and aborting the take off if the flow wasn't sufficiently high enough. I'm happy to report that the flow rate climbed nicely up though the teens as my takeoff roll progressed. I lifted off around 15-16 gph and decided to take it around the pattern. As I climbed through the crosswind to downwind turn I noted that the flow was in the 18.5gph range, RPM was at 2700, and EGTs were low 1300's. After a few more loops around the pattern everything seemed to be working as expected. I took it out of the pattern and dialed it into my normal cruse configuration which is typically 75% power at 2250 RPM and leaned to about 1425 on the hottest EGT. Everything sounded and felt fine. Flow was right at 9.5 GPH per usual. > >The only weird thing I noticed was at about 1700 RPM. When I turn from Downwind to Base and go from idle to about 2000 RPM like I usually do, right about 1700 RPM the engine kind of sags and then picks back up. It is very repeatable. Strangely there is no sag on the ground after a touch and go when I push the throttle in fast going from idle to full power anymore like there was with the old carb. > >Does anyone have any idea what that sag at 1700 is? Is there a nurd knob on the carb for this specifically? > >Thanks again for the great feedback! > >Matt Dralle > > >At 02:38 PM 12/18/2015 Friday, Matt Dralle wrote: > >>I'm still chasing down this weird problem with low fuel flow rates on the RV-6. I've replaced the mechanical fuel pump and got a rebuilt 4-5 carburetor, both of which were well over do for replacement/overhaul anyway. I haven't put the cowling back on yet, but I did a static run up to about 2350-2400 and am seeing about 9gph, which seems low to me? >> >>I pulled the fuel line off the carburetor and turned the electric fuel pump on and saw about 21 GPH flow. Is that considered "normal" or too low? >> >>Thanks for the feedback, >> >>Matt > >- >Matt Dralle


    Message 2


  • INDEX
  • Back to Main INDEX
  • PREVIOUS
  • Skip to PREVIOUS Message
  • NEXT
  • Skip to NEXT Message
  • LIST
  • Reply to LIST Regarding this Message
  • SENDER
  • Reply to SENDER Regarding this Message
    Time: 02:17:44 PM PST US
    From: vanremog@aol.com
    Subject: Re: Lycoming O-360 Fuel Flow Rate
    It's just the engineer in me, but I always like to do post mortems with failed components. In the case of the pump, I would want to understand what in the pump caused the blockage or failure to pump per spec. In the case of the carb I would want to understand if the main jet, float, filter or ??? were hosed. -GV -----Original Message----- From: Matt Dralle <dralle@matronics.com> Sent: Tue, Dec 22, 2015 12:21 pm Subject: RV-List: Re: Lycoming O-360 Fuel Flow Rate Well, it was probably the fuel pump. I think my flow rates right after replacing the fuel pump (but before I replaced the carb) were probably alright as they were similar to what I saw after the new carb. But, it was time for a new carb anyway, so I guess it worked out. Btw, as if all of this debacle wasn't frustrating enough, last weekend while trying to test all of this, the battery went dead. Checking the logs it was 36 months ago since I replaced it the last time. Guess that's about right. Sigh. Is it time to fly it yet? I've been working on it enough lately. ;-) 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: 210+ Hours TTSN - Version 2.0 Now Flying! RV-6 #20916 N360EM "The Flyer" http://www.mattsrv6.com - Matt's RV-6 Revitalization Log Status: 300+ 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. At 10:24 AM 12/21/2015 Monday, you wrote: >So what did you do to fix the problem Matt? > >Harry Crosby > > >---------- >From: "Matt Dralle" <dralle@matronics.com> >To: "RV-List" <rv-list@matronics.com>, LycomingEngines-list@matronics.com, rv6-list@matronics.com, rv10-list@matronics.com >Sent: Saturday, December 19, 2015 12:44:41 PM >Subject: RV-List: Re: Lycoming O-360 Fuel Flow Rate > > >Thank you to everyone that responded!! There were some great comments that got me going down the right path. > >Last night I got the cowling back on and took the RV-6 out on the runway and ran it up to full power with the intent of carefully watching the flow rate and aborting the take off if the flow wasn't sufficiently high enough. I'm happy to report that the flow rate climbed nicely up though the teens as my takeoff roll progressed. I lifted off around 15-16 gph and decided to take it around the pattern. As I climbed through the crosswind to downwind turn I noted that the flow was in the 18.5gph range, RPM was at 2700, and EGTs were low 1300's. After a few more loops around the pattern everything seemed to be working as expected. I took it out of the pattern and dialed it into my normal cruse configuration which is typically 75% power at 2250 RPM and leaned to about 1425 on the hottest EGT. Everything sounded and felt fine. Flow was right at 9.5 GPH per usual. > >The only weird thing I noticed was at about 1700 RPM. When I turn from Downwind to Base and go from idle to about 2000 RPM like I usually do, right about 1700 RPM the engine kind of sags and then picks back up. It is very repeatable. Strangely there is no sag on the ground after a touch and go when I push the throttle in fast going from idle to full power anymore like there was with the old carb. > >Does anyone have any idea what that sag at 1700 is? Is there a nurd knob on the carb for this specifically? > >Thanks again for the great feedback! > >Matt Dralle > > >At 02:38 PM 12/18/2015 Friday, Matt Dralle wrote: > >>I'm still chasing down this weird problem with low fuel flow rates on the RV-6. I've replaced the mechanical fuel pump and got a rebuilt 4-5 carburetor, both of which were well over do for replacement/overhaul anyway. I haven't put the cowling back on yet, but I did a static run up to about 2350-2400 and am seeing about 9gph, which seems low to me? >> >>I pulled the fuel line off the carburetor and turned the electric fuel pump on and saw about 21 GPH flow. Is that considered "normal" or too low? >> >>Thanks for the feedback, >> >>Matt > >- >Matt Dralle




    Other Matronics Email List Services

  • Post A New Message
  •   rv-list@matronics.com
  • UN/SUBSCRIBE
  •   http://www.matronics.com/subscription
  • List FAQ
  •   http://www.matronics.com/FAQ/RV-List.htm
  • Web Forum Interface To Lists
  •   http://forums.matronics.com
  • Matronics List Wiki
  •   http://wiki.matronics.com
  • 7-Day List Browse
  •   http://www.matronics.com/browse/rv-list
  • Browse RV-List Digests
  •   http://www.matronics.com/digest/rv-list
  • Browse Other Lists
  •   http://www.matronics.com/browse
  • Live Online Chat!
  •   http://www.matronics.com/chat
  • Archive Downloading
  •   http://www.matronics.com/archives
  • Photo Share
  •   http://www.matronics.com/photoshare
  • Other Email Lists
  •   http://www.matronics.com/emaillists
  • Contributions
  •   http://www.matronics.com/contribution

    These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.

    -- Please support this service by making your Contribution today! --