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Lycoming O-360 Fuel Flow Rate

 
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Matt Dralle
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PostPosted: Fri Dec 18, 2015 2:40 pm    Post subject: Lycoming O-360 Fuel Flow Rate Reply with quote

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

RV-8 #82880 N998RV "Ruby Vixen"
http://www.mattsrv8.com - Matt's Complete RV-8 Construction Log
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Status: 210+ Hours TTSN - Version 2.0 Now Flying!

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PostPosted: Fri Dec 18, 2015 2:40 pm    Post subject: Lycoming O-360 Fuel Flow Rate Reply with quote

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

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. http://klvk.matronics.com


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PostPosted: Fri Dec 18, 2015 2:40 pm    Post subject: Lycoming O-360 Fuel Flow Rate Reply with quote

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

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. http://klvk.matronics.com


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PostPosted: Fri Dec 18, 2015 2:43 pm    Post subject: Lycoming O-360 Fuel Flow Rate Reply with quote

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

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. http://klvk.matronics.com


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PostPosted: Fri Dec 18, 2015 3:43 pm    Post subject: Lycoming O-360 Fuel Flow Rate Reply with quote

You didn't say what your normal static RPM is for the engine/prop combination you have but:
Are you sure your mixture control is going full rich when firewalled? Push in full rich, disconnect from mixture lever and see if there is more travel left. There is a mixture stop adjustment/assembly/parts on M/S family carbs.

"IF" it still has travel left, it is working as rigged, just not as you would like.
Lycoming publishes expected fuel flow in the engine operations manual for your particular model, but it seems if that 2400 RPM is full throttle/Full mixture on your O-360/prop combo, it is low, very low. Something more like 76 lbs/hour at best power mixture which is like 12.5 gals/hour. If you really are only using 9 gph (at) 2400 you are making like 110 BHP instead of 170+.
I wouldn't try taking off like that.

On Fri, Dec 18, 2015 at 5:38 PM, Matt Dralle <dralle(at)matronics.com (dralle(at)matronics.com)> wrote:
Quote:
--> LycomingEngines-List message posted by: Matt Dralle <dralle(at)matronics.com (dralle(at)matronics.com)>


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

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.  http://klvk.matronics.com


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PostPosted: Fri Dec 18, 2015 6:24 pm    Post subject: Lycoming O-360 Fuel Flow Rate Reply with quote

You didn't say what manifold pressure or density altitude was but for sea level to 3000ft at WOT 2400 rpm a 180 hp 360 should make about 130-140 Hp and fuel flow is roughly 0.075 - 0.08 gph per Hp. FAA regulations (23.955) require 125% of 100% takeoff power fuel flow. 180 Hp * 0.08 gph = 24.4. 14.4 * 1.25 = 18 gph so your fuel flow sounds sufficient.

The fuel flow curves for Lycoming 180 Hp OI-360 shows 135 Hp is about 10.6 gph give or take depending on mixture.
Deems Herring

Quote:
Date: Fri, 18 Dec 2015 14:38:37 -0800


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?


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Matt Dralle
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PostPosted: Sat Dec 19, 2015 12:47 pm    Post subject: Lycoming O-360 Fuel Flow Rate Reply with quote

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:

Quote:
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

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. http://klvk.matronics.com


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Location: Livermore CA USA

PostPosted: Sat Dec 19, 2015 12:47 pm    Post subject: Lycoming O-360 Fuel Flow Rate Reply with quote

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:

Quote:
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

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. http://klvk.matronics.com


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PostPosted: Sat Dec 19, 2015 12:48 pm    Post subject: Lycoming O-360 Fuel Flow Rate Reply with quote

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:

Quote:
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

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. http://klvk.matronics.com


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Matt Dralle
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PostPosted: Sat Dec 19, 2015 12:50 pm    Post subject: Lycoming O-360 Fuel Flow Rate Reply with quote

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:

Quote:
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

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. http://klvk.matronics.com


- The Matronics LycomingEngines-List Email Forum -
 

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PostPosted: Tue Dec 22, 2015 12:19 pm    Post subject: Lycoming O-360 Fuel Flow Rate Reply with quote

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. Wink

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:
Quote:
So what did you do to fix the problem Matt?

Harry Crosby
----------
From: "Matt Dralle" <dralle(at)matronics.com>
To: "RV-List" <rv-list(at)matronics.com>, LycomingEngines-list(at)matronics.com, rv6-list(at)matronics.com, rv10-list(at)matronics.com
Sent: Saturday, December 19, 2015 12:44:41 PM
Subject: RV-List: Re: Lycoming O-360 Fuel Flow Rate



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


- The Matronics LycomingEngines-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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Joined: 08 Nov 2005
Posts: 25204
Location: Livermore CA USA

PostPosted: Tue Dec 22, 2015 12:20 pm    Post subject: Lycoming O-360 Fuel Flow Rate Reply with quote

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. Wink

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:
Quote:
So what did you do to fix the problem Matt?

Harry Crosby
----------
From: "Matt Dralle" <dralle(at)matronics.com>
To: "RV-List" <rv-list(at)matronics.com>, LycomingEngines-list(at)matronics.com, rv6-list(at)matronics.com, rv10-list(at)matronics.com
Sent: Saturday, December 19, 2015 12:44:41 PM
Subject: RV-List: Re: Lycoming O-360 Fuel Flow Rate



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


- The Matronics LycomingEngines-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?LycomingEngines-List

_________________
Matt Dralle
Matronics Email List Administrator
Back to top
View user's profile Send private message Send e-mail Visit poster's website
Matt Dralle
Site Admin


Joined: 08 Nov 2005
Posts: 25204
Location: Livermore CA USA

PostPosted: Tue Dec 22, 2015 12:20 pm    Post subject: Lycoming O-360 Fuel Flow Rate Reply with quote

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. Wink

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:
Quote:
So what did you do to fix the problem Matt?

Harry Crosby
----------
From: "Matt Dralle" <dralle(at)matronics.com>
To: "RV-List" <rv-list(at)matronics.com>, LycomingEngines-list(at)matronics.com, rv6-list(at)matronics.com, rv10-list(at)matronics.com
Sent: Saturday, December 19, 2015 12:44:41 PM
Subject: Re: Lycoming O-360 Fuel Flow Rate



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


- The Matronics LycomingEngines-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?LycomingEngines-List

_________________
Matt Dralle
Matronics Email List Administrator
Back to top
View user's profile Send private message Send e-mail Visit poster's website
Matt Dralle
Site Admin


Joined: 08 Nov 2005
Posts: 25204
Location: Livermore CA USA

PostPosted: Tue Dec 22, 2015 12:22 pm    Post subject: Lycoming O-360 Fuel Flow Rate Reply with quote

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. Wink

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:
Quote:
So what did you do to fix the problem Matt?

Harry Crosby
----------
From: "Matt Dralle" <dralle(at)matronics.com>
To: "RV-List" <rv-list(at)matronics.com>, LycomingEngines-list(at)matronics.com, rv6-list(at)matronics.com, rv10-list(at)matronics.com
Sent: Saturday, December 19, 2015 12:44:41 PM
Subject: RV-List: Re: Lycoming O-360 Fuel Flow Rate



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


- The Matronics LycomingEngines-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?LycomingEngines-List

_________________
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Matronics Email List Administrator
Back to top
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