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)
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| Subject: | 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... It provides
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and Wiki.
But most importantly, your List Contribution enables a forum where you and your
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It is YOUR CONTRIBUTION that directly enables all these aspects of Matronics List
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or, you can send a personal check to the following address:
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Thank you for your support!
Matt Dralle
Email List Administrator
Message 1
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| Subject: | Re: Lycoming Engine Fuel Flow Problem... |
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
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| Subject: | Re: 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 <dralle@matronics.com> 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
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| Subject: | Re: 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 <jmjones2000@mindspring.com> 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 <dralle@matronics.com> 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
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| Subject: | Re: RV-List: Lycoming Engine Fuel Flow Problem... |
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 <dralle@matronics.com>
>
>
> 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
>
>
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