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  #11  
Old 12-22-2015, 05:26 PM
Dmadd Dmadd is offline
 
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Location: Camas, WA
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Originally Posted by donoltman View Post
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  
Old 12-22-2015, 05:43 PM
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Ironflight Ironflight is offline
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Quote:
Originally Posted by Kyle Boatright View Post
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)...
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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  #13  
Old 12-22-2015, 06:56 PM
Kyle Boatright Kyle Boatright is offline
 
Join Date: Aug 2005
Location: Atlanta, GA
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Quote:
Originally Posted by Ironflight View Post
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).
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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  #14  
Old 12-22-2015, 07:33 PM
Darren S Darren S is offline
 
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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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  #15  
Old 12-23-2015, 09:16 AM
Rupester Rupester is offline
 
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Location: Mahomet, Illinois
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Default 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?
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  #16  
Old 12-23-2015, 10:09 AM
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Kahuna Kahuna is offline
 
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Quote:
Originally Posted by Rupester View Post
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?
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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  #17  
Old 12-23-2015, 11:08 AM
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Toobuilder Toobuilder is offline
 
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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.

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  #18  
Old 12-23-2015, 11:16 AM
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donaziza donaziza is offline
 
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Location: Atlanta
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Wink Stoichiometric info

Quote:
Originally Posted by Darren S View Post
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? ��
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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  #19  
Old 12-23-2015, 12:51 PM
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DanH DanH is offline
 
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Quote:
Originally Posted by Kahuna View Post
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.
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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  #20  
Old 12-23-2015, 02:39 PM
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RV10inOz RV10inOz is offline
 
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Quote:
Originally Posted by Toobuilder View Post
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.
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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