---------------------------------------------------------- Engines-List Digest Archive --- Total Messages Posted Wed 11/18/15: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 0. 09:45 AM - What's Your Contribution Used For? (Matt Dralle) 1. 07:38 AM - Re: Lycoming Engine Fuel Flow Problem... (Dj Merrill) 2. 11:35 AM - Re: Lycoming Engine Fuel Flow Problem... (Justin Jones) 3. 11:58 AM - Re: Lycoming Engine Fuel Flow Problem... (Justin Jones) 4. 08:29 PM - Re: RV-List: Lycoming Engine Fuel Flow Problem... (Tim Lewis) ________________________________ Message 0 _____________________________________ Time: 09:45:07 AM PST US From: Matt Dralle Subject: Engines-List: What's Your Contribution Used For? Dear Listers, You might have wondered at some point, "What's my Contribution used for?" Here are just a few examples of what your direct List support enables... 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List Contribution Web Site: http://www.matronics.com/contribution or, you can send a personal check to the following address: Matronics / Matt Dralle 581 Jeannie Way Livermore, CA 94550 Thank you for your support! Matt Dralle Email List Administrator ________________________________ Message 1 _____________________________________ Time: 07:38:30 AM PST US Subject: Re: Engines-List: Lycoming Engine Fuel Flow Problem... From: Dj Merrill On 11/17/2015 10:24 PM, Matt Dralle wrote: > 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? > Any of those are possible. One possibly easy check is to detach the fuel line from the carb, and direct it into a container. Do a fuel flow test to see how much fuel you are getting from the fuel system. That should tell you if the problem is in the carb or the fuel delivery system. -Dj -- Dj Merrill - N1JOV - EAA Chapter 87 Sportsman 2+2 Builder #7118 N421DJ - http://deej.net/sportsman/ Glastar Flyer N866RH - http://deej.net/glastar/ ________________________________ Message 2 _____________________________________ Time: 11:35:45 AM PST US From: Justin Jones Subject: Re: Engines-List: Lycoming Engine Fuel Flow Problem... Sounds like it could be a vacuum leak. Be sure to check your carburetor for security, cracks ect. Check the entire air delivery system from the carburetor to the tube attachments on the cylinders. If you have the angle valve engine, be sure to pay close attention to the intake tube Orings. Justin > On Nov 18, 2015, at 12:24, Matt Dralle wrote: > > > > 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 a! > nd 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 > > > > > > ________________________________ Message 3 _____________________________________ Time: 11:58:20 AM PST US From: Justin Jones Subject: Re: Engines-List: Lycoming Engine Fuel Flow Problem... I forgot to mention my train of thought that made me consider a vacuum leak. The low fuel flow numbers you are experiencing could be due to air being drawn into the engine somewhere other than the Venturi. If air bypasses the Venturi, it doesn't draw fuel in with, it resulting in a leaner fuel mixture. > On Nov 19, 2015, at 04:34, Justin Jones wrote: > > > Sounds like it could be a vacuum leak. Be sure to check your carburetor for security, cracks ect. Check the entire air delivery system from the carburetor to the tube attachments on the cylinders. If you have the angle valve engine, be sure to pay close attention to the intake tube Orings. > > Justin > > >> On Nov 18, 2015, at 12:24, Matt Dralle wrote: >> >> >> >> 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! > a! >> nd 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 > > > > > ________________________________ Message 4 _____________________________________ Time: 08:29:58 PM PST US Subject: Engines-List: Re: RV-List: Lycoming Engine Fuel Flow Problem... From: Tim Lewis After ruling out visible leakage and ensuring the mixture cable gives full mixture range motion (to the stop on the carb), I think I'd disconnect the fuel hose right before the carb and use the boost pump to see the max available fuel flow rate to the carb. That could give you some insight into blockages prior to the carb. This test (fuel flow volume) is described in the old FAA Experimental Aircraft Flight Test AC on page 23 (AC 90-89A, available at https://www.faa.gov/regulations_policies/advisory_circulars/index.cfm/go/document.information/documentID/23127). FAA recommends seeking 125% of normal max fuel flow (and they tell you how to estimate that value). VR Tim -- Tim Lewis -- HEF (Manassas, VA) A&P RV-6A N47TD -- 1104 hrs - sold RV-10 N31TD -- 650 hrs Matt Dralle wrote on 11/17/2015 10:24 PM: > --> RV-List message posted by: Matt Dralle > > > 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 a! > nd 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 > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message engines-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Engines-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/engines-list Browse Digests http://www.matronics.com/digest/engines-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.