Today's Message Index:
----------------------
1. 07:27 PM - Lycoming Engine Fuel Flow Problem... (Matt Dralle)
2. 08:10 PM - Re: Lycoming Engine Fuel Flow Problem... (Kelly McMullen)
3. 08:10 PM - Re: Lycoming Engine Fuel Flow Problem... (Ralph E. Capen)
4. 10:49 PM - Re: Lycoming Engine Fuel Flow Problem... (vanremog@aol.com)
Message 1
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| 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
Message 2
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| Subject: | Re: Lycoming Engine Fuel Flow Problem... |
You are correct. The FF is too low and it is reflected on the EGT and
CHT. In fact, you undoubtedly were LOP, producing about 140-150hp. A bit
surprising if it in fact still has a carburetor.
IMHO, if EGT goes above 1350 on takeoff roll, it is cause to abort if
feasible. It should be between 1200 and 1300, assuming sea level vicinity.
Plugged fuel filter, failing mechanical pump diaphram, carb fuel inlet
needle valve stuck, carb fuel vent plugged are all potential causes. If
there is any seepage on the mech pump drain, the diaphram is bad and not
generating the fuel pressure needed. The carb may or maynot have an
inlet screen that could be partially plugged. If the data goes back far
enough I would download the log from the Skyview and look for when the
problem first occurred. That may help you isolate when/where it happened
and what changed.
On 11/17/2015 8:24 PM, 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
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| Subject: | Re: Lycoming Engine Fuel Flow Problem... |
Sounds like you have a blockage in your fuel filters that just barely allows enough
fuel to flow.....
I had a similar issue with my AFP injected IO360B1F6. There is a small fuel inlet
filter that was clogged with fine black goo. Cleaned that and added a larger
capacity filter upstream that has a smaller micron rating than the inlet filter
- it is on my annual list now.
Cured the issue for me.
Glad you had enough fuel flow to continue flying and safely land. Throttling back
helped me - I didn't experience mine on take off though.....boost pump didn't
help me....
-----Original Message-----
>From: Matt Dralle <dralle@matronics.com>
>Sent: Nov 17, 2015 10:24 PM
>To: rv-list@matronics.com, lycoming-list@matronics.com, engines-list@matronics.com
>Subject: RV-List: 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 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: Lycoming Engine Fuel Flow Problem... |
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