jetdriven Posted November 3, 2011 Report Posted November 3, 2011 Looks like 50 LOP is 20% more NMPG than 50 ROP, a 6% loss in speed to get that, and CHT's across the board 50 degrees cooler. Better not do that, it will burn up your engine. Or a 1100 Mile range ROP, vs a 1350 mile LOP range for the same fillup. Quote
KSMooniac Posted November 3, 2011 Report Posted November 3, 2011 I have trouble with the power settings too from the pics, so a summarized table of data would be nice. How much HP does this Ovation have? 280 or 310? I'd offer that you don't have to lean all the way to 50 LOP and in fact something around 20 LOP might offer a bit more speed, but you're in the ballpark. Quote
GeneS Posted November 3, 2011 Author Report Posted November 3, 2011 The four photos were taken yesterday on a flight out of KSMS to KPNS at 8000 ft. OAT on the ground was about 65F. The first picture is full power climb out. The second is cruise at 80F ROP for 182 kts at 18.1 gph. The third is cruise at 50F ROP for 182 kts at 17.1 gph. The last is cruise at 50 LOP for 173 kts at 13.2 gph. In all cases, the CHT on the #5 cylinder was lower than before so I'm happy with the pixie holes. Seems to be an effective solution to a common problem. This was not meant to be a LOP/ROP thread. I run both ways as far as that goes. I rarely need to stretch my range,but when I do, I'll run LOP. Usually, I just run fast and lean to 50 deg or a little more ROP. Normally, I'm at 8000 + so I'm WOT. If I'm lower, I limit the MP to 23" and run ROP, keeping CHT under 380F. That's how I do it and I haven't had a problem with cylinders, ever. Thanks to everyone for the assistance on the pixie fix. Gene Schmidt Quote
Jvancecpa Posted November 3, 2011 Report Posted November 3, 2011 Man I sure would like to see those "pixie" holes!! Quote
Jvancecpa Posted November 9, 2011 Report Posted November 9, 2011 Anybody.....picture of "pixie holes"? Quote
Mooney_Allegro Posted November 9, 2011 Report Posted November 9, 2011 I'll try to get a photo tomorrow morning and post it up. Quote
Jvancecpa Posted November 10, 2011 Report Posted November 10, 2011 Gene, Is that a picture that you posted? All I am seeing is a box with an X in it. Is everyone else seeing something that I am not? If so, could you pm it to me or repost. Thank you. Jud Quote
GeneS Posted November 10, 2011 Author Report Posted November 10, 2011 Crap. I tried to post it from my eyefone. I'll get it up as soon as I get to a real computer. Quote
Mooney_Allegro Posted November 10, 2011 Report Posted November 10, 2011 this is the pixie hole. Quote
GeneS Posted November 10, 2011 Author Report Posted November 10, 2011 ugh. why is this so difficult? Quote
jetdriven Posted November 10, 2011 Report Posted November 10, 2011 Looks like there is room for two holes. Nice job though. How much does it lower the CHT on #5? 1 Quote
Jvancecpa Posted November 11, 2011 Report Posted November 11, 2011 Who did the drilling? My mechanic says that if he was to drill the hole he could get in trouble because it is not authorized by Mooney, blah, blah, blah. Is the hole 1" in diameter and how difficult is it to do? I will pick my plane up on the 30th of November and will fly it back home which will be 4 hours of flight. I will monitor the cht on #5 closely. If I get a large differential in temps, then I will do something and it looks like the pixie hole is the way to go. Thanks for help. Quote
Jvancecpa Posted November 12, 2011 Report Posted November 12, 2011 Gene, Do you have Gamis or the original injectors? Quote
GeneS Posted November 13, 2011 Author Report Posted November 13, 2011 Quote: Jvancecpa Who did the drilling? My mechanic says that if he was to drill the hole he could get in trouble because it is not authorized by Mooney, blah, blah, blah. Is the hole 1" in diameter and how difficult is it to do? I will pick my plane up on the 30th of November and will fly it back home which will be 4 hours of flight. I will monitor the cht on #5 closely. If I get a large differential in temps, then I will do something and it looks like the pixie hole is the way to go. Thanks for help. Quote
GeneS Posted November 13, 2011 Author Report Posted November 13, 2011 Quote: Jvancecpa Gene, Do you have Gamis or the original injectors? Quote
Jvancecpa Posted November 13, 2011 Report Posted November 13, 2011 Quote: GeneS Pixies did the drilling, that's why it's call the pixie hole, duh. Quote
Jvancecpa Posted November 13, 2011 Report Posted November 13, 2011 I withdraw my prior comment. Quote
N513ZM Posted November 13, 2011 Report Posted November 13, 2011 Quote: jetdriven Looks like there is room for two holes. Nice job though. How much does it lower the CHT on #5? Quote
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