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#71
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#72
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"Dave Stadt" wrote Why should I move? I can get alcohol free mogas. I taxi up and they fill my tanks. Price is only a couple of cents higher than the local filling stations. What state, and what airport? -- Jim in NC |
#73
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Morgans wrote:
"Dave Stadt" wrote Why should I move? I can get alcohol free mogas. I taxi up and they fill my tanks. Price is only a couple of cents higher than the local filling stations. What state, and what airport? Louisiana - 4R7 |
#74
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"Dave Stadt" wrote in message
m... Yes, but none in California. Plus, the gas in CA leaves the refineries already containing alcohol, so the ideas about using gas meant for farm equipment, etc., are non starters. Grumble. -jav That sucks. So move! Why should I move? I can get alcohol free mogas. I taxi up and they fill my tanks. Price is only a couple of cents higher than the local filling stations. I take it you're not in Kalifornia. In which case, a move would be unnecessary. |
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"Darrel Toepfer" wrote in message ... Morgans wrote: "Dave Stadt" wrote Why should I move? I can get alcohol free mogas. I taxi up and they fill my tanks. Price is only a couple of cents higher than the local filling stations. What state, and what airport? Louisiana - 4R7 Illinois - C77 |
#76
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"Dave Stadt" wrote in message ... "Darrel Toepfer" wrote in message ... Morgans wrote: "Dave Stadt" wrote Why should I move? I can get alcohol free mogas. I taxi up and they fill my tanks. Price is only a couple of cents higher than the local filling stations. What state, and what airport? Louisiana - 4R7 Illinois - C77 The issue was the crapped up situation in California...though you still might want to move :~) |
#77
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Today on a long cross-country flight I experimented with the "lean-find"
function on my JPI-700 EGT/CHT meter. As always, it told me to stop leaning when my fuel flow was right around 15 GPH. (This at 5500 feet, and 23 squared.) Using the wisdom of the group, I kept pulling the mixture back until my FS-450 was showing around 13 gph fuel flow, watching the EGTs and CHTs like a hawk. Obviously everything did run hotter, but EGTs never topped 1550 degrees, and CHTs never topped 360 degrees. This is a tad hotter than I've been running, but the engine sounded fine, and all cylinders stabilized within 100 degrees of each other -- which is as good as it gets on my normally aspirated O-540. Later, climbing to 8500 feet, we pulled it back to around 12 gph, with the same results. (We usually would run around 14 gph at that altitude.) So, perhaps I've been wasting gas for no good reason. Thanks to all who responded. -- Jay Honeck Iowa City, IA Pathfinder N56993 www.AlexisParkInn.com "Your Aviation Destination" |
#78
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In rec.aviation.owning Jay Honeck wrote:
: Obviously everything did run hotter, but EGTs never topped 1550 degrees, and : CHTs never topped 360 degrees. This is a tad hotter than I've been : running, but the engine sounded fine, and all cylinders stabilized within : 100 degrees of each other -- which is as good as it gets on my normally : aspirated O-540. You mean 100 EGT, right? 100 CHT would be pretty horrible, and 100 EGT is actually pretty ragged. Just for grins, try the same power and try the two different equalization techniques of Deakin: - Run high enough (8500 is pretty good) so you can run WOT. Back it off about 1/4" of MP from full throttle. Cocking the throttle plate slightly like this helps mine. - Try the carb heat... partial to full. I've only got analog gauges and a switch to go between them (and two less jugs). I can say that both of those techniques get my EGT's from within 50-75 degrees of each other to within 10-25 degrees of each other (as near as I can tell on my tiny gauge). YMMV... I suspect the big six on a Cherokee probably has worse fuel distro than the four in mine. -Cory : Later, climbing to 8500 feet, we pulled it back to around 12 gph, with the : same results. (We usually would run around 14 gph at that altitude.) What percent power? Just as a datapoint, I'll get about 8.5 gph at 65-70% of 180hp. Adjusted for 6 jugs would be 12.75 gph. The compression ratio doesn't matter for fuel flow vs. percent. : So, perhaps I've been wasting gas for no good reason. Thanks to all who : responded. : -- Your plugs will be even happier. No lead *or* carbon buildup. -Cory ************************************************** *********************** * Cory Papenfuss * * Electrical Engineering candidate Ph.D. graduate student * * Virginia Polytechnic Institute and State University * ************************************************** *********************** |
#79
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You mean 100 EGT, right?
Yep. - Run high enough (8500 is pretty good) so you can run WOT. Back it off about 1/4" of MP from full throttle. Cocking the throttle plate slightly like this helps mine. I discovered this technique on my own, when I found it impossible to get the six bars on my engine analyzer to line up at full throttle. To my surprise, pulling the MP back JUST a smidge resulted in all six bars falling neatly in line. YMMV... I suspect the big six on a Cherokee probably has worse fuel distro than the four in mine. Yeah, I've spoken with a couple of O-540 experts, and they both say that 100 degrees apart is about as good as possible with the horrible fuel distribution of a normally aspirated Lycoming six-cylinder engine. -- Jay Honeck Iowa City, IA Pathfinder N56993 www.AlexisParkInn.com "Your Aviation Destination" |
#80
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In rec.aviation.owning Jay Honeck wrote:
: YMMV... I suspect the big six on a Cherokee probably has worse fuel distro : than the four in mine. : Yeah, I've spoken with a couple of O-540 experts, and they both say that 100 : degrees apart is about as good as possible with the horrible fuel : distribution of a normally aspirated Lycoming six-cylinder engine. : -- I had a friend with an O-540 that built a fuel distribution "swirler" (like the thing on TV). Basically, a ~4x4" piece of stainless steel. Cut 10 or so pie-shaped wedges around a carb-outlet-sided circle scribed in it. Take those pie-shaped wedges, bend them 70-80 degrees off the plate, and give them all a 45 degree twist. Put inline between the carb and bottom of the oil pan/intake. It got his cylinders closer together in EGT. Of course doing such modifications on anything other than an experimental engine/airframe would immediately cause it to crash, be illegal, immoral, reckless, dangerous, irresponsible, as well as cause global warming, world hunger, and eventually make the sun burn out. -Cory -- ************************************************** *********************** * Cory Papenfuss * * Electrical Engineering candidate Ph.D. graduate student * * Virginia Polytechnic Institute and State University * ************************************************** *********************** |
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