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#111
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MoGas Tips, Tricks, Concerns, How To
If you'd just get the operation, you and Mary wouldn't have to USE
conundrums. Jim Golly, what a conundrum... |
#112
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MoGas Tips, Tricks, Concerns, How To
Switching to courtroom mode
"So, Teledyne Director Of Engineering, would you please tell the court why you recommended exceessive leaning and poor quality automobile fuel when we have sworn testimony that it was this lethal combination that caused this poor widow and her children to lose a husband and father?" It sure as hell wasn't for engineering reasons that they made these pronouncements. mode off Jim Teledyne Continental and (I think) Lycoming have both gone on record to say that mogas is damaging to their engines. They are certainly multi-millon dollar aircraft engine companies and have have no incentive to lie to you. They are also multi-million dollar aircraft engine companies that recommend against LOP operation. (Unless you are running a FADEC system). Allen |
#113
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MoGas Tips, Tricks, Concerns, How To
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#114
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MoGas Tips, Tricks, Concerns, How To
"RST Engineering" wrote in message .. . Uhhh, no it didn't. It was allowed a MAXIMUM of 0.5 ml / gallon of TEL, but from the '50s on, the actual TEL count was zero in 80. Jim Thanks Jim. That's the first I had heard that...but it was not declared as no-lead fuel, so the post asking for what was the favorite unleaded fuel was a loaded question, eh? |
#115
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MoGas Tips, Tricks, Concerns, How To
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#116
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MoGas Tips, Tricks, Concerns, How To
Jay Honeck wrote:
: A touch of Carb heat and the throttle cracked ever so slightly. It creates : turbulence in the intake system that evens things out rather nicely. : Care to expand on that? Boy, I'm ever so worried to jump into a religious shouting match. But... When I flew the Cherokee 180, carb'd O-360 or course, I could run LOP with carb heat turned up. I could use the mix to slow the engine down until it wasn't producing any useful power. It ran smoothly during this. Without carb heat it would let you know if you went too far LOP. I can't repeat these experiments; I'm sure the guy who owns my plane now would be upset! -- Aaron C. |
#117
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MoGas Tips, Tricks, Concerns, How To
Here's another tip for carbureted engines only. When operating at full
throttle, it is often helpful to back off on the throttle until you see just the tiniest drop in MP (if you have a MP gauge, otherwise look for the slightest drop in RPM), and leave it there instead of fully open. That cocks the throttle plate just enough to set up a slightly turbulent flow, and that helps mix the fuel and air for better combustion. A touch of carburetor heat may help, too. Using our JPI EDM700 engine analyzer as our guide, we usually can get all 6 cylinders within 70 degrees of one another using the "pull the throttle back a hair" method at altitudes from 4500 to 8500 feet. At full throttle, we're lucky to get them within 150 degrees of matched. Never tried the carb heat thing. We don't have a carb temperature gauge. -- Jay Honeck Iowa City, IA Pathfinder N56993 www.AlexisParkInn.com "Your Aviation Destination" |
#118
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MoGas Tips, Tricks, Concerns, How To
"Aaron Coolidge" wrote in message ... Jay Honeck wrote: : A touch of Carb heat and the throttle cracked ever so slightly. It creates : turbulence in the intake system that evens things out rather nicely. : Care to expand on that? Boy, I'm ever so worried to jump into a religious shouting match. But... Is it "religious", or religion [anecdote (my mechanc says...,the manufacturers say without supporting evidence], blind faith [redundant]) vs science (graphs, charts test stand data)? |
#119
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MoGas Tips, Tricks, Concerns, How To
A couple of points:
1) My copy of ASTM spec D910 page 0539 states that the allowable TEL content of 100LL avgas is 2 milliliters per gallon NOT 2 grams per gallon. This means there will be over 1/3rd pound of lead in an 80 gallon tank of 100LL, plus about 1/5th pound of ethlylene dibromide scavenging agent. 2) My muffler "failures" were from the internal flame tubes, which must be present and in reasonable condition if they were originally present when new, but are not required on later mufflers that did not have the internal flame tubes. We did a proctoscope exam with a small flashlight at annual to verify their condition. Our engine was run about 50 deg rich of peak, or so we thought as we had only a single EGT probe. There was little engine roughness though if the mixture was leaned further. Manifold pressure was set to 21 inches for cruise, less at higher altitudes. I suspect many 172s were just run until the flame tubes were all gone out the tailpipe. |
#120
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MoGas Tips, Tricks, Concerns, How To
"nrp" wrote in message oups.com... A couple of points: 1) My copy of ASTM spec D910 page 0539 states that the allowable TEL content of 100LL avgas is 2 milliliters per gallon NOT 2 grams per gallon. This means there will be over 1/3rd pound of lead in an 80 gallon tank of 100LL, plus about 1/5th pound of ethlylene dibromide scavenging agent. Aside from the curiousity of mixing gallons and metric measurments, 2 gr/gallon is 160 grams in an 80 gallon tank. 160/454=0.3524 lbs, so it's virtually the same thing. SAW, 160 gr in a tank that holds 36,320 grams, 1/3 lb in a tank holding 480 lbs. |
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