Today's Message Index:
----------------------
1. 12:20 PM - Re: Lycoming O-360 Fuel Flow Rate (Matt Dralle)
2. 02:17 PM - Re: RV-List: Re: Lycoming O-360 Fuel Flow Rate (vanremog@AOL.COM)
Message 1
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| 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
>
>--> RV-List message posted by: Matt Dralle <dralle@matronics.com>
>
>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
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| Subject: | Re: RV-List: 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
--> RV-List message posted by: Matt Dralle <dralle@matronics.com>
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
>
>--> RV-List message posted by: Matt Dralle <dralle@matronics.com>
>
>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
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