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1. 10:25 AM - Re: RV-List: Re: Lycoming O-360 Fuel Flow Rate (HCRV6@comcast.net)
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| Subject: | Re: RV-List: Re: Lycoming O-360 Fuel Flow Rate |
So what did you do to fix the problem Matt?
Harry Crosby
----- Original Message -----
From: "Matt Dralle" <dralle@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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