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1. 07:44 PM - Re: RV-List: Re: Lycoming O-360 Fuel Flow Rate (Steve Senegal)
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| Subject: | Re: RV-List: Re: Lycoming O-360 Fuel Flow Rate |
I've been following this issue with interest but maybe I missed something.
What fixed the problem?
Steve
650.346.6967
Sent from my iPhone between flights.
> On Dec 19, 2015, at 12:44, Matt Dralle <dralle@matronics.com> wrote:
>
> --> 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
>
> RV-8 #82880 N998RV "Ruby Vixen"
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