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12-22-2015, 05:26 PM
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Join Date: Jul 2008
Location: Camas, WA
Posts: 481
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hahahaha
"Like"
Quote:
Originally Posted by donoltman
They are right. I fly a O-470U every day at 23 inches, 2200 rpm and 50 on the lean side for 7 hours a day. It now has 2500 hours on the engine, 70's across the board and has never had a jug off. I also have 1 CHT gauge and 1 egt guage. There is way too much time spent and way too much money spent on probes for every cylinder. The engine will tell you when something is wrong. We used to be pilots that actually listened to our engines. Now we just look at graphs that we download. Just fly the thing.
Don
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12-22-2015, 05:43 PM
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VAF Moderator / Line Boy
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Join Date: Jan 2005
Location: Dayton, NV
Posts: 12,256
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Quote:
Originally Posted by Kyle Boatright
Isn't the intent of LOP to choose a power setting and adjust the mixture LOP while maintaining that setting? Yes, you will have to move at least one more knob, but if your intent is to fly at <say> 65% and 170 knots while minimizing fuel burn, you can do it. You don't have to allow the power to drop below your target setting (density altitude issues excepted)...
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I'm not saying that LOP isn't worth it Kyle - I was just pointing out that at some point, you can get so lean that power just goes away - not advocating that anyone would run that way. I always run LOP, from about the time I leave the traffic pattern (and sometimes before.
I live at 4400' msl. We see about 77% at WOT on take-off, and by the time we clear the airport, we're below 75%. I just leave the throttle wide open, bring the prop back to a reasoanble din, and lean until I feel the sag which says Ive gone past peak - that keeps the CHT's from climbing, makes for a nice smooth engine, and gives great economy (while still givign me great cruise).
__________________
Paul F. Dye
Editor at Large - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)
http://Ironflight.com
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12-22-2015, 06:56 PM
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Join Date: Aug 2005
Location: Atlanta, GA
Posts: 4,218
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Quote:
Originally Posted by Ironflight
I'm not saying that LOP isn't worth it Kyle - I was just pointing out that at some point, you can get so lean that power just goes away - not advocating that anyone would run that way. I always run LOP, from about the time I leave the traffic pattern (and sometimes before.
I live at 4400' msl. We see about 77% at WOT on take-off, and by the time we clear the airport, we're below 75%. I just leave the throttle wide open, bring the prop back to a reasoanble din, and lean until I feel the sag which says Ive gone past peak - that keeps the CHT's from climbing, makes for a nice smooth engine, and gives great economy (while still givign me great cruise).
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I'm just saying that you don't *have* to slow down. If you maintain 65%, you don't slow down. You also don't get the fuel savings you'd get by starting at 65%, then leaning down to 55%, but you do get better fuel efficiency running 65% LOP than running 65% ROP.
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Kyle Boatright
Marietta, GA
2001 RV-6 N46KB
2019(?) RV-10
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12-22-2015, 07:33 PM
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Join Date: Apr 2009
Location: Canada
Posts: 439
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Wow! What great info. and reminders. Thanks all. Love this place. I think my favorite line was, "I don't think it holds stoichiometric water". Whaaaaaat? 🙃
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12-23-2015, 09:16 AM
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Join Date: Dec 2005
Location: Mahomet, Illinois
Posts: 2,195
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GRT accuracy on "lean find"
In another thread parallel to this one, a poster said he found the lean-find feature on his EFIS inaccurate. I have always leaned according to my GRT EFIS/EIS. Has anyone checked the accuracy of the GRT in finding the LOP point? Any reason to doubt it?
__________________
Terry Ruprecht
RV-9A Tip-up; IO-320 D2A
S. James cowl/plenum
(Dues paid thru Nov '18)
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12-23-2015, 10:09 AM
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Join Date: Dec 2004
Location: Gold Hill, NC25
Posts: 2,400
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Quote:
Originally Posted by Rupester
In another thread parallel to this one, a poster said he found the lean-find feature on his EFIS inaccurate. I have always leaned according to my GRT EFIS/EIS. Has anyone checked the accuracy of the GRT in finding the LOP point? Any reason to doubt it?
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I use this often and it works very well. What I find in flying with other pilots is that they move the red knob too fast to get decent egt reading cause they are worried about the big pull. The 'big pull' and EFIS lean features are not to be used together.
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Kahuna
6A, S8 ,
Gold Hill, NC25
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12-23-2015, 11:08 AM
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Join Date: Jul 2009
Location: Mojave
Posts: 4,652
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The lean find feature works just as well from the other side of the hill right? Just "big pull" to the lean side, then slowly richen the mixture to find peak (allowing the EFIS to do its magic) and then lean back to where you want it.
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WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.
Michael Robinson
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Harmon Rocket II -SDS EFI
RV-8 - SDS CPI
1940 Taylorcraft BL-65
1984 L39C
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12-23-2015, 11:16 AM
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Join Date: Jun 2007
Location: Atlanta
Posts: 745
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Stoichiometric info

Quote:
Originally Posted by Darren S
Wow! What great info. and reminders. Thanks all. Love this place. I think my favorite line was, "I don't think it holds stoichiometric water". Whaaaaaat?
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Hi Darren,
Google EAA
When you get there, click on Education & resources blue box
slide down to "View the EAA webinar archives" Click on that (Not the big blue box)
See webinars channel
Click on "Webinars" in lower left hand corner
Underneath the Aircraft Spruce propeller, see "pages". (on right side) Scroll to page 8
On the left side, scroll down to the 4th webinar--"How to destroy your engine in one minute". It's an hour and 1/2, and its by Mike Busch. You'll get all educated on "Stoichiometric"
Well Shoot Darren, It looks like I gave you wrong info. Go to this web address below, and that will give you the correct video. "How to lean your engine"--also by Mike Busch-----Sorry
http://www.eaavideo.org/video.aspx?v=2534345030001
Have fun
Last edited by donaziza : 12-23-2015 at 11:33 AM.
Reason: Fixed to correct info
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12-23-2015, 12:51 PM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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Quote:
Originally Posted by Kahuna
I use this often and it works very well. What I find in flying with other pilots is that they move the red knob too fast to get decent egt reading cause they are worried about the big pull. The 'big pull' and EFIS lean features are not to be used together.
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That's right. First do a big pull to the lean side, then turn on the "lean" function and slowly push rich to find peak.
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Dan Horton
RV-8 SS
Barrett IO-390
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12-23-2015, 02:39 PM
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Join Date: May 2008
Location: Brisbane Qld. Aust.
Posts: 2,271
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Quote:
Originally Posted by Toobuilder
The lean find feature works just as well from the other side of the hill right? Just "big pull" to the lean side, then slowly richen the mixture to find peak (allowing the EFIS to do its magic) and then lean back to where you want it.
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Actually it works MUCH better from the lean side, and you just find the first one to peak and work from there. BMP let cooldown then if you want to split hairs find peak from the lean side and do it with a cooler engine. 
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David Brown
DYNON Authorised Dealer and Installer
The two best investments you can make, by any financial test, an EMS and APS!
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