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#41
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because I dont want to kill the engine.
when you lean that much and dont get any engine roughness, my common sense (and knowing my airplane) tells me thats more then plenty. I was leaning by tempeture today and 12 gph was right at 100 degrees ROP Dan Luke wrote: "Jeff" wrote: I have leaned it to 8 gph and the engine was still running fine, but that just seems to much. Why? -- Dan C172RG at BFM |
#42
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it peaks at about 10-10.5 gph
today I took my time, after it peaked, I noted the temp, then increased the richness about 100 degrees, which put me at 12-12.2 gph Ron Rosenfeld wrote: On Sun, 23 Nov 2003 08:49:28 -0800, Jeff wrote: what makes me nervous is that the engine does not get rough, I was assuming due to the gami's, so I am not sure where the cut off point would be. I have leaned it to 8 gph and the engine was still running fine, but that just seems to much How many degrees LOP are you at 8 or 9 gph? Ron (EPM) (N5843Q, Mooney M20E) (CP, ASEL, ASES, IA) |
#43
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with as many types of planes out there as there are, there is no telling, asking
someone to guess the type of plane you have is about the same as asking someone to guess your social security number. I havnt seen any get the book number either, but you get pretty close if you subtract 10 kts from what they say they will do. Excxeption is Cirrus, people who own them tend to say they get pretty much what the book says they will get. Stu Gotts wrote: Which kind to you think? I've yet to see the majority of planes get the book numbers, so I'd say that's a bit aggressive. |
#44
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On Sun, 23 Nov 2003 18:45:14 -0800, Jeff wrote:
it peaks at about 10-10.5 gph today I took my time, after it peaked, I noted the temp, then increased the richness about 100 degrees, which put me at 12-12.2 gph Well, 100° ROP *is* in a safe area so far as CHT is concerned. But you'd still reduce your peak cylinder pressures by 7-8% by running the same HP at 50° LOP. This will result in less stresses on your engine. And your BSFC will be improved, also, leading to decreased fuel consumption for the same HP generated. Perhaps as you gain more experience with the GAMI's, you'll feel more comfortable running LOP. I don't believe that running 50° LOP EGT with a smooth engine puts you in any risk of getting so lean that the engine might stop. However, even if you choose to keep things ROP, you'll still show some improvement in fuel consumption due to the more balanced fuel flows. Best wishes, Ron (EPM) (N5843Q, Mooney M20E) (CP, ASEL, ASES, IA) |
#45
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see this is what confuses me, if you run LOP, lose some HP, then add MP to regain the lost HP,
are'nt you still putting the same stress on the engine? I have been running the gami's for about 8 months now. Ron Rosenfeld wrote: Well, 100° ROP *is* in a safe area so far as CHT is concerned. But you'd still reduce your peak cylinder pressures by 7-8% by running the same HP at 50° LOP. This will result in less stresses on your engine. And your BSFC will be improved, also, leading to decreased fuel consumption for the same HP generated. Perhaps as you gain more experience with the GAMI's, you'll feel more comfortable running LOP. I don't believe that running 50° LOP EGT with a smooth engine puts you in any risk of getting so lean that the engine might stop. However, even if you choose to keep things ROP, you'll still show some improvement in fuel consumption due to the more balanced fuel flows. Best wishes, Ron (EPM) (N5843Q, Mooney M20E) (CP, ASEL, ASES, IA) |
#46
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On Sun, 23 Nov 2003 20:57:28 -0800, Jeff wrote:
see this is what confuses me, if you run LOP, lose some HP, then add MP to regain the lost HP, are'nt you still putting the same stress on the engine? I have been running the gami's for about 8 months now Engine stress is not solely a matter of HP generated. The reason you are NOT putting the same stresses on the engine is because in the LOP regime, cylinder peak pressures are less (for the same HP generated). CHT is also less. The reason cylinder peak pressures are less is because the rate of burn of the fuel charge is slower. Ron (EPM) (N5843Q, Mooney M20E) (CP, ASEL, ASES, IA) |
#47
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When you say "kill the eingine" do you mean have it stop running or break
it? Mike MU-2 "Jeff" wrote in message ... because I dont want to kill the engine. when you lean that much and dont get any engine roughness, my common sense (and knowing my airplane) tells me thats more then plenty. I was leaning by tempeture today and 12 gph was right at 100 degrees ROP Dan Luke wrote: "Jeff" wrote: I have leaned it to 8 gph and the engine was still running fine, but that just seems to much. Why? -- Dan C172RG at BFM |
#48
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What kind of stress are you talking about? Engines experience themal stress
and mechanical stress. Both are lower when running the same power LOP. Mike MU-2 "Jeff" wrote in message ... see this is what confuses me, if you run LOP, lose some HP, then add MP to regain the lost HP, are'nt you still putting the same stress on the engine? I have been running the gami's for about 8 months now. Ron Rosenfeld wrote: Well, 100° ROP *is* in a safe area so far as CHT is concerned. But you'd still reduce your peak cylinder pressures by 7-8% by running the same HP at 50° LOP. This will result in less stresses on your engine. And your BSFC will be improved, also, leading to decreased fuel consumption for the same HP generated. Perhaps as you gain more experience with the GAMI's, you'll feel more comfortable running LOP. I don't believe that running 50° LOP EGT with a smooth engine puts you in any risk of getting so lean that the engine might stop. However, even if you choose to keep things ROP, you'll still show some improvement in fuel consumption due to the more balanced fuel flows. Best wishes, Ron (EPM) (N5843Q, Mooney M20E) (CP, ASEL, ASES, IA) |
#49
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"O. Sami Saydjari" wrote in message ...
I am looking at buying one of two planes: a 1978 Mooney M20J or a 1965 Piper Commanche PA-24-260. (3) I heard Mooney is teetering on bankruptcy. Is this a real big downside? So what? Piper has already been there. Take the Mooney, it is newer,faster and more efficient. |
#50
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"Jeff" wrote in message ... see this is what confuses me, if you run LOP, lose some HP, then add MP to regain the lost HP, are'nt you still putting the same stress on the engine? I have been running the gami's for about 8 months now. Don't confuse cylinder pressures (also addressed in Deakin's articles) with the stress of HEAT, particularly in CHT. |
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