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12-01-2013, 08:44 AM
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Join Date: Sep 2005
Location: Maple Grove, MN
Posts: 2,333
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Quote:
Originally Posted by Bart
Thanks David, I was in cruise. 23 inches and 2200 RPM. I was leaned but not LOP. More like 50 ROP. The boost pump was off. It was a short flight after refueling although I did extend the flight about 20 mins troubleshooting. No reoccurrence in anything I tried. I now have the EFIS set to record so I'll pass that data if a repeat is in my future. Thanks for your insights.
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Bart - do you remember what the fuel flow was for those settings when you had the problem (also engine hp if it isn't listed already)?
One possibility is hysteresis in the mixture control. For example, if you are on the edge of being too lean, and the last mixture movement was towards the lean side, the mixture lever arm could move or rattle towards the lean side of the cable hysteresis travel. I always finish leaning with a tiny move towards the rich side to eliminate that possibility. Just something to think about. The more cumulative bends in the cable, the more hysteresis is available.
__________________
Alex Peterson
RV6A N66AP 1700+ hours
KADC, Wadena, MN
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12-01-2013, 08:44 PM
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Join Date: Jan 2008
Location: Pecan Plantation (0TX1)
Posts: 167
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my recollection is about 12 gallons and 67% hp.
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12-03-2013, 06:29 AM
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Join Date: Jan 2005
Location: Granbury Texas
Posts: 1,136
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Quote:
Originally Posted by Bart
my recollection is about 12 gallons and 67% hp.
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Hi Bart,
I have been following your thread since we talked last week and nothing jumped out at me that has not been mentioned here. Your last post is different from the performance of my 10. Although I have read a few post from others with FF near 11 or 12 I have never been able to lean that low. I am normally at cruise power say 24/23 burning around 14 with cylinder temps around 380 and EGT in the low 1200's.
Pat
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12-03-2013, 06:38 AM
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Join Date: Jun 2006
Location: Delaware, OH (KDLZ)
Posts: 4,196
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Quote:
Originally Posted by Pat Stewart
Hi Bart,
I have been following your thread since we talked last week and nothing jumped out at me that has not been mentioned here. Your last post is different from the performance of my 10. Although I have read a few post from others with FF near 11 or 12 I have never been able to lean that low. I am normally at cruise power say 24/23 burning around 14 with cylinder temps around 380 and EGT in the low 1200's.
Pat
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OT, but.....
Pat,
Does your RV-10 have an electronic ignition?
Most of the folks that I'm aware of that are running leaner than you have EI and are running LOP.
I'm getting about the same as you at the moment during my Phase I, but I'm not going to run LOP for awhile due to having a new engine.
bob
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12-03-2013, 07:16 AM
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Join Date: Jan 2005
Location: Granbury Texas
Posts: 1,136
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Good point Bob, I am stock IO540 with mags.
Pat
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12-03-2013, 09:36 AM
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Join Date: Jul 2010
Location: Marietta, GA (KCZL)
Posts: 308
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This may sound kinda silly but I thought I would mention it so the topic is thorough. Try checking your nose wheel break out force. On our -10 we finally discovered after quite a bit of troubleshooting that if it falls much below the recommended 26lbs, it could possibly cause the fairing to shimmy ever so slightly in the relative wind.
__________________
Brian Unrein
RV10 N42BU 900+ hours!
First flight 6-16-12
https://N42BU.com
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12-03-2013, 11:02 AM
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Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,797
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Quote:
Originally Posted by Pat Stewart
Good point Bob, I am stock IO540 with mags.
Pat
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I too have stock Slick mags and routinely run fuel flows of less than 10 gal/hr around 21" MP (or wide open throttle up high) and 2200 -2300 RPM. Lean of peak, of course. I did exchange some injectors to better match up the cylinders.
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12-03-2013, 11:47 AM
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Join Date: May 2010
Location: Denver
Posts: 564
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Quote:
Originally Posted by BobTurner
I too have stock Slick mags and routinely run fuel flows of less than 10 gal/hr around 21" MP (or wide open throttle up high) and 2200 -2300 RPM. Lean of peak, of course. I did exchange some injectors to better match up the cylinders.
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My IO-540 has 2 Bendix 1200 series mags, AFP injectors matched to 0.1 gph. At Denver elevations and above, I routinely run WOT, 23-2400 rpm on 10.5 gph.
Jim Berry
RV-10
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12-03-2013, 03:10 PM
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Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,797
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back to vibration
This is most likely not your problem, but:
I would get a "different" sound after attitude changes, power changes, etc. A low frequency vibration. It would only go away after a many seconds, not a few. I finally tracked it down to the inlet air ramp being a little too long (too forward). It contacted not only the flexible baffle, but could, with a tiny shifting of the cowl, contact the edge of the aluminum backing plate that held the rivets that held the flexible baffle. That apparently caused the inlet ramp to vibrate, and maybe the whole cowling too? Anyway, took a 16th of an inch off the inlet ramp, with a file; the problem went away.
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12-10-2013, 11:04 AM
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Join Date: Jan 2008
Location: Pecan Plantation (0TX1)
Posts: 167
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Hi Pat
Regular mags. 50 degrees ROP with similar temps. 12 gph. Could the flowscan counting be making the difference?
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