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#61
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Engine Making Metal (Was: Nasa Icing courses)
Jay Honeck wrote:
Some, however, like Ray's engine, do -- and in very peculiar ways. (Just ONE cam lobe went bad?) Why? Once again. When the layer of hardened steel wears through, the rest of the lobe wears *very quickly*. George Patterson Coffee is only a way of stealing time that should by rights belong to your slightly older self. |
#62
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Engine Making Metal (Was: Nasa Icing courses)
George Patterson wrote:
David Lesher wrote: Saw a show w/ a Japanese craftsman making a sword. Two layers of different steels. Pounded it thin; folded it over; pounded... Many layers later, that was the sword... Yep, that's a very old technique. Westerners call it "Damascus steel." Got a knife made using that technique. Beautiful grain, sort of like a nice gun stock made with multiple layers of different wood, beautiful when carved. The Monk |
#63
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Engine Making Metal (Was: Nasa Icing courses)
Running the engine too slow at startup. Apparently, the cams in some
engines get lubrication mainly from the oil splashing around inside the case. In some engines, 1000 RPM may not be sufficient for full lubrication after startup. My A&P suggested 1100 - 1200 RPM. Isn't that a stitch? Your A&P says 1000 RPM is too *slow* for proper lubrication. Jim Macklin (and many others) says it may be too *fast* to run your engine before proper lubrication has occurred. Who is right? And my A&P says 1000 RPM or slower, primarily to save your prop on loose rocks but also to ensure long engine life. Argh. Wouldn't you think there would be SOME science to this? -- Jay Honeck Iowa City, IA Pathfinder N56993 www.AlexisParkInn.com "Your Aviation Destination" |
#64
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Engine Making Metal (Was: Nasa Icing courses)
"Jim Macklin" wrote in message news:Wgcwf.40975$QW2.5751@dukeread08... point and then pull the mixture to shut it down. That should show a slight 25-50 rpm increase just as it shuts down since idle should be a little rich. For my TIO540-S1AD, Lycoming says five rpm, not more than ten. Stan |
#65
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Engine Making Metal (Was: Nasa Icing courses)
"Happy Dog" wrote in message ... I've gone through a couple on one engine and they had those exact symptoms. One AME suggested that the front lobes wear more quickly since the cam is slightly elevated at the front so the oil drains off more quickly. There are as many theories as worn cams, it sometimes seems. Especially when you take your engine to your flight physical! :-) |
#66
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Engine Making Metal (Was: Nasa Icing courses)
Jay Honeck wrote:
Argh. Wouldn't you think there would be SOME science to this? If there is, it's available from Lycoming or Continental for your engine. Not from "my A&P says...." George Patterson Coffee is only a way of stealing time that should by rights belong to your slightly older self. |
#67
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Engine Making Metal (Was: Nasa Icing courses)
I'll buy that, always best to use specific data rather than
a generic answer. It takes a pretty good eye and tach to see 5 rpm. -- James H. Macklin ATP,CFI,A&P -- The people think the Constitution protects their rights; But government sees it as an obstacle to be overcome. some support http://www.usdoj.gov/olc/secondamendment2.htm See http://www.fija.org/ more about your rights and duties. "Stan Prevost" wrote in message ... | | "Jim Macklin" wrote in message | news:Wgcwf.40975$QW2.5751@dukeread08... | point and then pull the mixture to shut it down. That | should show a slight 25-50 rpm increase just as it shuts | down since idle should be a little rich. | | | For my TIO540-S1AD, Lycoming says five rpm, not more than ten. | | Stan | | |
#68
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Engine Making Metal (Was: Nasa Icing courses)
Argh. Wouldn't you think there would be SOME science to this?
If there is, it's available from Lycoming or Continental for your engine. Not from "my A&P says...." Well, I am blessed to have an A&P who: 1. Doesn't work on little planes cuz he needs the money. 2. Is an award-winning home builder 3. Has 40 years in the business 4. Is an accomplished pilot 5. Has rebuilt over 100 O-540s, including mine. What he says about engines is, in my world, gospel. -- Jay Honeck Iowa City, IA Pathfinder N56993 www.AlexisParkInn.com "Your Aviation Destination" |
#69
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Engine Making Metal (Was: Nasa Icing courses)
Stan Prevost wrote:
"Jim Macklin" wrote in message news:Wgcwf.40975$QW2.5751@dukeread08... point and then pull the mixture to shut it down. That should show a slight 25-50 rpm increase just as it shuts down since idle should be a little rich. For my TIO540-S1AD, Lycoming says five rpm, not more than ten. The mixture on injected engines typically is not as rich at idle as carburetted engines, so the rpm increase should not be as great. George Patterson Coffee is only a way of stealing time that should by rights belong to your slightly older self. |
#70
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Engine Making Metal (Was: Nasa Icing courses)
"Jay Honeck" wrote in message news:Hxkwf.474673$084.253721@attbi_s22... Isn't that a stitch? Your A&P says 1000 RPM is too *slow* for proper lubrication. Jim Macklin (and many others) says it may be too *fast* to run your engine before proper lubrication has occurred. Who is right? Your O-540 is probably better at oil distribution than my O-235. Your engine is substantially larger and more expensive. They can afford to give it a better oiling system than exists in a smaller, cheaper engine. As for trusting Lycoming to tell us: I believe they have a commitment to safety, but they also make money from parts, like cam shafts. Adding to that, summer is much different than winter oil at startup, not to mention cylinder clearances. On startup, do you want the cylinders to wear out faster, or would you rather protect your cam? You may not be able to have both in an optimum fashion on some engines. Less RPM may help the cylinders, but leave the cam with less lubrication. It makes me wish that all cams had a direct spray oil system, and that there was an electric oil pump that could be used to lubricate the engine prior to startup. Paul Missman |
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