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#11
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Gene Whitt is back on line
"Robert Chambers" wrote in message om... seriously? banning leaning below 5000'? I guess they enjoy cleaning lead fouled plugs then. You have to remember, though, that many pilots and even mechanics think lead fouling is caused by leaning TOO MUCH, not too LITTLE. I can't fathom some blanket rule like that, they should be teaching proper leaning techniques not banning the use of it. Standard procedures in many (most?) places says 50 or so ROP...about the worst place you can run your engine. |
#12
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Gene Whitt is back on line
Matt Barrow wrote:
Standard procedures in many (most?) places says 50 or so ROP...about the worst place you can run your engine. That's where I was taught to lean to. I think the reason was that it is a safe place, whereas lean of peak has some advantages, but can get you into trouble with detonation if you are not really careful. Any suggestions? Brad |
#13
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Leaning (was Gene Whitt is back on line)
Standard procedures in many (most?) places says 50 or so ROP...about the
worst place you can run your engine. If it really =is= the worst place, how did the engine makers come to reccomend it? Jose -- Money: what you need when you run out of brains. for Email, make the obvious change in the address. |
#14
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Gene Whitt is back on line
At low cruise settings, lean to get roughness (miss-firing
of the leanest cylinder) and then richen to smooth. You have to do it very gently, just pressure on the mixture or you'll over-shoot the settings. That is with a carb. If you have fuel injection, it will run smooth until it quits, follow the tables for fuel flow from the manual or use the EGT. For take-off above 3,000-5,000 feet density, you should lean to get the proper mixture and max power. -- James H. Macklin ATP,CFI,A&P -- The people think the Constitution protects their rights; But government sees it as an obstacle to be overcome. some support http://www.usdoj.gov/olc/secondamendment2.htm See http://www.fija.org/ more about your rights and duties. "bsalai" wrote in message ... | Matt Barrow wrote: | | | Standard procedures in many (most?) places says 50 or so ROP...about the | worst place you can run your engine. | | | That's where I was taught to lean to. I think the reason was that it is | a safe place, whereas lean of peak has some advantages, but can get you | into trouble with detonation if you are not really careful. | | Any suggestions? | | Brad |
#15
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Leaning (was Gene Whitt is back on line)
50 RPM drop on the rich side is too rich at cruise... 50
degrees rich of peak on the EGT is about right with a carb. With fuel injection, just a little below peak or even at peak if the cruise power is set below 70%. At low power settings you can run at peak since the actual temperatures will be low. If you have a calibrated EGT (TIT) follow the limits. -- James H. Macklin ATP,CFI,A&P -- The people think the Constitution protects their rights; But government sees it as an obstacle to be overcome. some support http://www.usdoj.gov/olc/secondamendment2.htm See http://www.fija.org/ more about your rights and duties. "Jose" wrote in message . net... | Standard procedures in many (most?) places says 50 or so ROP...about the | worst place you can run your engine. | | If it really =is= the worst place, how did the engine makers come to | reccomend it? | | Jose | -- | Money: what you need when you run out of brains. | for Email, make the obvious change in the address. |
#16
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Gene Whitt is back on line
John,
Several of the operations I know here actually ban leaning below 5000 feet. Change operations! Run, don't walk! -- Thomas Borchert (EDDH) |
#17
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Leaning (was Gene Whitt is back on line)
Jim,
50 RPM drop on the rich side is too rich at cruise... 50 degrees rich of peak on the EGT is about right with a carb. With fuel injection, just a little below peak or even at peak if the cruise power is set below 70%. At low power settings you can run at peak since the actual temperatures will be low. If you have a calibrated EGT (TIT) follow the limits. Ok, kids, now lets count all the misunderstandings and factually wrong statements in that post. Hint: There are at least 5. -- Thomas Borchert (EDDH) |
#18
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Gene Whitt is back on line
Bsalai,
Any suggestions? Uhm, get educated! For starters, read John Deakin's columns on engine management at www.avweb.com -- Thomas Borchert (EDDH) |
#19
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Leaning (was Gene Whitt is back on line)
50 RPM drop on the rich side is too rich at cruise.
I've never heard of leaning to an RPM drop... just to an EGT drop. With fuel injection, just a little below peak or even at peak if the cruise power is set below 70%. Why is fuel injection different? More even mixtures across the cylinders? Jose -- Money: what you need when you run out of brains. for Email, make the obvious change in the address. |
#20
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Leaning (was Gene Whitt is back on line)
Yes, engine roughness is caused by one cylinder misfiring.
Fuel injection is properly calibrated is the same on all cylinders so the engine runs smooth and balanced. "Jose" wrote in message om... | 50 RPM drop on the rich side is too rich at cruise. | | I've never heard of leaning to an RPM drop... just to an EGT drop. | | With fuel injection, just a little below peak or even at | peak if the cruise power is set below 70%. | | Why is fuel injection different? More even mixtures across the cylinders? | | Jose | -- | Money: what you need when you run out of brains. | for Email, make the obvious change in the address. |
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