Today's Message Index:
----------------------
0. 09:46 AM - What's Your Contribution Used For? (Matt Dralle)
1. 05:04 AM - Re: Lycoming Engine Fuel Flow Problem... (Warren Brecheisen)
2. 08:39 AM - Re: Lycoming Engine Fuel Flow Problem... (Denis Walsh)
3. 10:23 AM - Re: Lycoming Engine Fuel Flow Problem... (Ralph E. Capen)
4. 11:40 AM - Re: Lycoming Engine Fuel Flow Problem... (Matt Dralle)
5. 08:30 PM - Re: 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
for the expensive, commercial-grade Internet connection used on the List.
It pays for the regular system hardware and software upgrades enabling the highest
performance possible for List services such as the Archive Search Engine,
List Browser, and the Web Forums. It pays for the over 23 years of on-line
archive data always available for instant search and access. And, it offsets
the many hours spent writing, developing, and maintaining the custom applications
that power these List Service such as the List Browse, Search Engine, Forums,
and Wiki.
But most importantly, your List Contribution enables a forum where you and your
peers can communicate freely in an environment that is free from moderation,
censorship, advertising, commercialism, SPAM, and computer viruses.
It is YOUR CONTRIBUTION that directly enables all these aspects of Matronics List
services. Please support it today with your List Contribution. Its one of
the best investments you can make in your Sport!
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
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| Subject: | Re: Lycoming Engine Fuel Flow Problem... |
Admittedly, with all the readings on your monitoring giving abnormal numbers, it
appears to be be a problem with the fuel system, but I would first check to
see that the problem is real. Do you know what the engine pulled for static rpm,
wot on the ground before the problem showed up? If so, then I would check
the wot rpm now to see if you are getting full power. Did you fly long enough
to check your real fuel usage by refueling and comparing usage against what
you would normally expect? If you seem to get full rpm (power) and real fuel
usage is normal then there MIGHT be an electrical problem that's affecting your
monitoring system, like a bad ground.
Warren
> On Nov 18, 2015, at 12:48 AM, vanremog@aol.com wrote:
>
> 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?
Message 2
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| Subject: | Re: Lycoming Engine Fuel Flow Problem... |
I have a similar set up with an A1A. Your observations and deductions seem logical
to me. I would do the easiest thing first, and check the boost pump on to
see if it brings up the flow/pressure. This would point to the mechanical pump
as a problem.
By the way, it is my opinion that you should always take off with the boost pump
on. I also use a procedure by which I check the boost pump for pressure before
engine start, then start with only the mechanical pump. When the run up is
complete, Then I turn on the boost pump for take off. Again this is another
chance to catch a failed or failing mech pump before take off.
Hope this helps.
Denis Walsh
denis.walsh@comcast.net
> On 17Nov, 2015, at 20:24, 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... |
Denis,
I use your method for take-offs also!
Ralph
-----Original Message-----
>From: Denis Walsh <denis.walsh@comcast.net>
>Sent: Nov 18, 2015 11:37 AM
>To: "rv list matronics.com" <rv-list@matronics.com>
>Subject: Re: RV-List: Lycoming Engine Fuel Flow Problem...
>
>
>I have a similar set up with an A1A. Your observations and deductions seem logical
to me. I would do the easiest thing first, and check the boost pump on
to see if it brings up the flow/pressure. This would point to the mechanical
pump as a problem.
>
>By the way, it is my opinion that you should always take off with the boost pump
on. I also use a procedure by which I check the boost pump for pressure before
engine start, then start with only the mechanical pump. When the run up
is complete, Then I turn on the boost pump for take off. Again this is another
chance to catch a failed or failing mech pump before take off.
>
>Hope this helps.
>
>
>Denis Walsh
>denis.walsh@comcast.net
>
>
>> On 17Nov, 2015, at 20:24, 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: Lycoming Engine Fuel Flow Problem... |
I switched tanks with no change in flow. So it would seem to not to be related
to the fuel tanks or their plumbing specifically. I'm anxious to dig in and
figure out what's going on...
Matt
At 10:48 PM 11/17/2015 Tuesday, you wrote:
>Have you cleaned all your screens?
>Did you switch tanks?
>Did you check your vents?
>-GV
>Sent from a galaxy far far away...
>
>
>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
>
>
Matt G Dralle | Matronics | 581 Jeannie Way | Livermore | CA | 94550
925-606-1001 V | 925-606-6281 F | dralle@matronics.com Email
http://www.matronics.com/ WWW | Featuring Products For Aircraft
Message 5
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| Subject: | Re: 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:
>
>
> 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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