Cessna 400 Lean of Peak Lean Assist
Sunday, June 12th, 2011 at
1:36 am
This is a screenshot movie Leaning the 2008 Cessna 400 lean of peak. This is the Garmin G1000 Engine System page in Lean Assist view.
Tagged with: Assist • Cessna • Lean • Peak
Filed under: Garmin Video Reviews
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@ElClerko Haven’t flown LOP, huh? But temperatures aren’t higher LOP. EGT’s are linear up to peak and then back down. CHT’s are considerable lower on the lean side versus it’s rich side counterpart.
To avoid unecessary arguing with me about LOP there are 4 requirements needed to even begin to think about doing it. (From John Deakin’s articles) 1. Fly it often, 2. Install a modern digital engine monitor (I prefer the JPI EDM-700), 3. Install GAMIjectors fuel injectors. 4. Know what you are talking about. I can’t stress number 4 enough. LOP is not for the faint of heart. I took the 2 day seminar and read over the material and articles for 4 weeks straight before attempting LOP in my aircraft.
Anyone who disagrees with LOP operation for any “reason” simply has no clue what they are talking about. You are just regurgitating old wives tales and quickly drawn conclusions. I can say this because I was one of them. I encourage every recip pilot to take the advanced pilot seminar in Ada, OK (google it) and if you can’t afford it then read everyone of the engine related articles of John Deakin’s Pelican’s Perch on AvWeb (google it). Amazing what pilots and mechanics DON’T know about engines.
@RogerDeanSmart
Absoluteley!
Flying LOP with an TSIO engine is really like an ‘financial-russian-roulette’…
At some point LOP the combustion starts to Knock. … A knocking combustion AND the higher temperatures LOP are like you where forging your cylinders and valves… WHILE FLYING ! …
But still… it’s allways the pilots decision.
… -> A Usage of 15-17 Gal per hour …. or maybe 6 cylinders per 500 hours XD ..
your decission
@ElClerko I agree with you also- if you want to keep the “hard wear and tear off an engine” I recommend you fly with atleast 50deg rich of peak. Doing this will most likely eliminate “buying a new engine”. On these airplanes, and the cost of a new one, you should lean some, but not agressive!
@sksakm14
Well, first of then i think you are very lucky – or really know what you do.
It also might have something to do with your missing turbo-chargers/intercoolers.
One other odd thing is: some aircraft handbooks recomend LOP, on the other hand the engine handbook ‘kind-of’ forbids it.
With an (especially continental!) TSIO-engine i really would’t try it … LOP can cause you a f***ing huge amount of money..
And if you do: DO IT WITH EGT!!! .. NOT TIT..
I believe you are spending too much time in the caution range. Get through there as quickly as possible and back to 50 degrees lean of peak.
@ElClerko Odd, seeing as my Mooney’s IO-550 has about 2300 hours on it and is still running strong. Only replaced two cylinders and about to replace a third in its ten year life. Oil analysis, compressions (all in the mid 70s except for the soon to be replaced cylinder), and EGT’s all indicate several hundred hours more life. I have operated LOP aproximately 95% of the time and ROP only in the winter.
Hi… Im an aircraft mechanic and let me tell you:
Leaning of peak is just a silly sales-argument for the C400 or the former colubia 400.
We just had a colubia400 which was flown with lean of peak….. All 6 cyl. where dead at 700 hours TT!
If you want to save thousands of dollars -> fly at least -50°F RICH of peak!!!
…. If you spend so much on an airplane.. don’t even think about saving some dollars by leaning the engine… Really… DON’T !!!
PS.: Read the Engine manual -.-
@avi8tir If the POH doesn’t recommend it, don’t attempt to fly your aircraft lean of peak. Some people modify their engines with GAMI injectors, and a good quality engine monitor, then its okay to run LOP. Its not something you want to just experiment with, because if you run it too hot, or if one cylinder isn’t at least 50 degrees LOP, you can seriously damage the engine. In short, if its approved and you have the equipment, do it! Happy flying.
does the POH recomment this?
can you explain a bit what you are doing?
wow – never flown it LOP. so, you just keep leaning until it peaks and drops back to 1625? Thats about a 5 gph savings over the ROP setting.
amazing. LOP’s the only way to go… Lycoming better catch up!
nice