Pietenpol-List: Gasoline questions

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Pietenpol-List: Gasoline questions

Post by matronics »

Original Posted By: helspersew(at)aol.com
After watching that I got off my rear end and glued rib 31! Very inspirational!Thanks for posting that Dan!Scotty--------ScottyTamworth, AustraliaBuilding a Corvair Powered Pietenpol Air Camperwww.scottyspietenpol.comRudder, Vert stab, Elevators and 30 Ribs built...Read this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Gasoline questions
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Post by matronics »

Original Posted By: Gene Rambo
Ok, I guess I don't get it.In the last day or so there have been several posts detailing anecdotal experiences with the use of different gasolines, comparing 100LL, unleaded auto fuel etc. Some of the posts blamed the lead for fouling of plugs, and also sticking of valves, and the implication was that the lead was a "bad" thing. When I went to A&P school, oh those many years ago, I can recall that the reason for the lead was that there was some advantage to scavenging of exhaust gasses. Seeing that the addition of lead to gasoline was the norm for many decades, I can only assume that the lead was added for a reason, creating some advantage in engine performance. The old 100 octane aviation gasoline had much more lead than the modern 100LL. The "wizards of smart" that were responsible for such things must have had a good reason for leaving some lead in the 100LL. How can the little bit of lead that is now used be responsible for plug and valve problems, but for all those previous decades it was just fine and dandy?Anyone with an opinion, informed or not, please chime-in so I can be enlightened (or entertained at least) :O)Dan HelsperPuryear, TN.________________________________________________________________________________
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Re: Pietenpol-List: Gasoline questions

Post by matronics »

Original Posted By: Gene Rambo
Lead lubricates valves. The stuff on plugs is CARBON, not lead. Gene RamboSent from my iPhoneOn Jun 21, 2011, at 8:58 PM, helspersew(at)aol.com wrote:> Ok, I guess I don't get it.> > In the last day or so there have been several posts detailing anecdotal experiences with the use of different gasolines, comparing 100LL, unleaded auto fuel etc. Some of the posts blamed the lead for fouling of plugs, and also sticking of valves, and the implication was that the lead was a "bad" thing. When I went to A&P school, oh those many years ago, I can recall that the reason for the lead was that there was some advantage to scavenging of exhaust gasses. Seeing that the addition of lead to gasoline was the norm for many decades, I can only assume that the lead was added for a reason, creating some advantage in engine performance. The old 100 octane aviation gasoline had much more lead than the modern 100LL. The "wizards of smart" that were responsible for such things must have had a good reason for leaving some lead in the 100LL. How can the little bit of lead that is now used be responsible for plug and valve problems, but for all those previous decades it was just fine and dandy?> > Anyone with an opinion, informed or not, please chime-in so I can be enlightened (or entertained at least) :O)> > Dan Helsper> Puryear, TN.> > ============================================================================================================================================> ________________________________________________________________________________
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Pietenpol-List: Re: Gasoline questions

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Original Posted By: "Jerry Dotson"
And, tetraethyl lead boosts octane, but I am no chemist. Gene RamboSent from my iPhoneOn Jun 21, 2011, at 8:58 PM, helspersew(at)aol.com wrote:> Ok, I guess I don't get it.> > In the last day or so there have been several posts detailing anecdotal experiences with the use of different gasolines, comparing 100LL, unleaded auto fuel etc. Some of the posts blamed the lead for fouling of plugs, and also sticking of valves, and the implication was that the lead was a "bad" thing. When I went to A&P school, oh those many years ago, I can recall that the reason for the lead was that there was some advantage to scavenging of exhaust gasses. Seeing that the addition of lead to gasoline was the norm for many decades, I can only assume that the lead was added for a reason, creating some advantage in engine performance. The old 100 octane aviation gasoline had much more lead than the modern 100LL. The "wizards of smart" that were responsible for such things must have had a good reason for leaving some lead in the 100LL. How can the little bit of lead that is now used be responsible for plug and valve problems, but for all those previous decades it was just fine and dandy?> > Anyone with an opinion, informed or not, please chime-in so I can be enlightened (or entertained at least) :O)> > Dan Helsper> Puryear, TN.> > ============================================================================================================================================> ________________________________________________________________________________Subject: Pietenpol-List: Re: Gasoline questions
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Pietenpol-List: Re: Gasoline questions

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Original Posted By: "Billy McCaskill"
Here are some links that might clear the air a little. I will state my opinionand it is no engine with a compression ratio of 7.0 or less needs any lead atall. Lead is an octane booster. Read the Shell link closely.http://www.shell.com/home/content/aviat ... -----Jerry Dotson59 Daniel Johnson RdBaker, FL 32531Started building NX510JD July, 2009wing, tailfeathers done, fuselage rollingusing Lycoming O-235Read this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: Gasoline questions
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Pietenpol-List: Re: Cloudcars Prop Performance

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Original Posted By: "Bill Church"
Subject: Re: Pietenpol-List: Gasoline questions> I've heard lots of stories of sticking valves in small continentals > like > the A-65 when using 100LL. I've been told its because they don't > run > hot enough to prevent the lead from depositing on the shaft of the > valve, causing it to bind in the guide. An old A&P that was > expaining it > to me called it 100*L*otsa *L*ead. I live in Florida, and rarely > see > my oil temps above 140. Another thing to consider is the > difference in > specific gravity between 100LL and auto gas. This effectively > changes > the float level, which changes your mixture. When I rebuilt my > carb, I > used non-ethanol auto gas to set the float level> On 6/21/2011 8:58 PM, helspersew(at)aol.com wrote:> > Ben Charvet> Expected 103 Heat index today. Probably 2000' density altitude at > 35 msl> Titusville, Fl> > Ok, I guess I don't get it.> > In the last day or so there have been several posts detailing > > anecdotal experiences with the use of different gasolines, > comparing > > 100LL, unleaded auto fuel etc. Some of the posts blamed the lead > for > > fouling of plugs, and also sticking of valves, and the > implication was > > that the lead was a "bad" thing. When I went to A&P school, oh > those > > many years ago, I can recall that the reason for the lead was > that > > there was some advantage to scavenging of exhaust gasses. Seeing > that > > the addition of lead to gasoline was the norm for many decades, I > can > > only assume that the lead was added for a reason, creating some > > advantage in engine performance. The old 100 octane aviation > gasoline > > had much more lead than the modern 100LL. The "wizards of smart" > that > > were responsible for such things must have had a good reason for > > leaving some lead in the 100LL. How can the little bit of lead > that is > > now used be responsible for plug and valve problems, but for all > those > > previous decades it was just fine and dandy?> > Anyone with an opinion, informed or not, please chime-in so I can > be > > enlightened (or entertained at least) :O)> > Dan Helsper> > Puryear, TN.> > *> >> >> > *> > > -- > Ben Charvet, PharmD> Staff Pharmacist> Parrish Medical center> ________________________________________________________________________________Subject: Pietenpol-List: Re: Cloudcars Prop Performance
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Pietenpol-List: Re: Gasoline questions

Post by matronics »

Original Posted By: "Dick N"
Subject: Pietenpol-List: Re: Gasoline questions> > My brother has a Skyranger with 240 hours on the Rotax 912ULS running 93 octanewith 10% ethanol with no problems to date. We can't find any gas > without ethanol in it. The only difference we can tell between the > non-ethanol and the 10% ethanol is it takes a little more per hour > but not much more. He has been running the 10% ethanol since 2007.> > --------> Jerry Dotson> 59 Daniel Johnson Rd> Baker, FL 32531> > Started building NX510JD July, 2009> wing, tailfeathers done, fuselage rolling> using Lycoming O-235> > > > > Read this topic online here:> > http://forums.matronics.com/viewtopic.p ... 773#343773> > > > > > > > > > ________________________________________________________________________________
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Pietenpol-List: Re: Gasoline questions

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Original Posted By: "Jerry Dotson"
Thanks to everyone for the advice on fuel for the A engine.I have the engine down now to redo the exhaust stacks. I will keep the valves well oiled in the meantime and maybe put a little oil in the fuel when I restart it. Don L________________________________________________________________________________Subject: Pietenpol-List: Re: Gasoline questions
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Post by matronics »

Original Posted By: Ben Charvet
I have a pretty good bit of auto gas experience but not in recent years. We ranauto gas in a Pawnee with an O-540 235 HP and a Stearman with a P&W 985 in the70's. That gas had some lead in it. Then a Cessna 150 with an O-320 150 HP offa Piper Apache for several years with zero problems. The gas I ran in the Cessna150 was unleaded 89 octane from Standard Oil. Filled it from my 500 gallontank. I never got past the smell. The only difference I could tell betweenavgas and auto gas was the smell.--------Jerry Dotson59 Daniel Johnson RdBaker, FL 32531Started building NX510JD July, 2009wing, tailfeathers done, fuselage rollingusing Lycoming O-235Read this topic online here:http://forums.matronics.com/viewtopic.p ... ______Date: Wed, 22 Jun 2011 08:11:03 -0400
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Re: Pietenpol-List: Gasoline questions

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Original Posted By: Michael Perez
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Re: Pietenpol-List: Gasoline questions

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Original Posted By: Ben Charvet
Subject: Re: Pietenpol-List: Gasoline questionsMy airport coffee discussions lead me to believe that plug fowling is more of aproblem on the early engines that were OK with 80 Octane than on engines thatrequire the higher octane. While I will probably be able to fly my old Bonanza on anything with the octaneof hair oil, There is concern that suddenly stopping the use of 100 LL with noreplacement could ground 20 % of our fleet. That affects everyone who flies.We don't need a divot like that in our pilot population. Blue Skies,Steve D----- Original Message -----
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Post by matronics »

Original Posted By: Michael Perez
The unsubstantiated "short life span" claim was regarding scimitar propellers ingeneral, NOT Cloudcars propellers. However, Cloudcars did issue a response whenthe question was posed:http://forums.matronics.com/viewtopic.php?t=69612Bill C.Read this topic online here:http://forums.matronics.com/viewtopic.p ... ______Date: Wed, 22 Jun 2011 07:28:36 -0700 (PDT)
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Re: Pietenpol-List: Re: Cloudcars Prop Performance

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Original Posted By: Michael Perez
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Pietenpol-List: Re: Gasoline questions

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Original Posted By: "Jack Phillips"
I am flying behind stock Cont. C-85-12F engine with the old style cylinder heads.I have an all metal fuel system except for an 8" piece of aircraft qualityair-quip hose between the gascolator and carb. I have a metal float and needleand seat in my carb. Here is my experience with auto and 100LL. I have foundthat when I run pure auto gas that it is a little harder to start but stilleasy to do whether the engine is hot or cold. If I run the auto gas for a fewhundred hours without the Marvel Mystery oil in the gas, I risk sticking anexhaust valve on the right front cylinder. The fix is to just remove the exhaustvalve and run a 7/16" reamer through the guide, hand lap the valve and reassemble it. Now if I run 100LL it will start with less priming and will floodeasier when hot. If pure 100LL is run for about 60 to 80hours I will be blessedwith a lead fowled lower plug. All that being said, I typically will fillup with auto one time and 100LL the next time without the use of the MarvelMystery oil. I have never had a problem with this method and it is easy to doif you are just flying locally. Out here on the west coast we don't have Mogasavailable at the airports. One other point I must make. Because I have anall metal fuel system and don't fly above 9000 feet, I have never been concernedwith the auto gas additives (alcohol and ethanol) and have not had any engineproblems related to them. Maybe I am just lucky. Your results may vary, [/b]--------Scott LiefeldFlying N11MS since March 1972Steel TubeC-85-12Wire WheelsBrodhead in 1996Read this topic online here:http://forums.matronics.com/viewtopic.p ... __________
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RE: Pietenpol-List: Gasoline questions

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Original Posted By: owner-pietenpol-list-server(at)matronics.com
100 Octane (the green stuff) had 10 times the amount of lead that was in80/87 (the old red stuff). 100LL (the blue stuff) has less lead that 100,but it still has 4 times as much as 80 Octane had.Jack PhillipsNX899JP "Icarus Plummet"Smith Mountain Lake, Virginia _____
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Pietenpol-List: Re: Gasoline questions

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Original Posted By: "Jerry Dotson"
I wish I had taken more pictures of all the "lead" I flaked out of thecylinders and out of these plugs. It filled the palm of my hand, twice! Thisis the result of a trip from Atlanta to Key West, Fl. One summer, Harold andI decided to fly to Key West, so off we went. Mike flew with me in thestraight tail 150 and Paul rode along with Harold in his 100HP J3 Cub. Onthe trip I had to fly at 1900 to 2050 RPM to be able to fly beside the Cub.Normally I fly the Cessna at 2550 cruise. At this reduced setting, theengine never got up to operating temperature. We logged 25 hours of flyingtime on this trip over a 10 day period, but did not realize I was having aproblem until about a month later. On landing at Huntsville, AL, I got 2stuck valves on final at the airport. I got them unstuck and flew back home,but one valve stuck again when I reduced power at my home airport. I pulledthe cylinders and cleaned about a half pint of chalky tan lead deposits outof the cylinders and had to really work on the spark plugs. Jump ahead 2years - The first year that a couple of the Big Piets went to Sun n Fun, Iflew the Cessna with spare parts and tools, just in case we had a problem. Ihad the same lead problem flying with the Piets. I had to fly at 1800 to1900 RPM for 12 hours and got the same leading problem. this time I triedthe "knock the valve into the cylinder" fix and everything is back tonormal. (see article I wrote in the June Sport Aviation) So the moral of this story is: When the Cubs fly somewhere, I fly my Cub.When the Cessnas fly, I fly the Cessna, and for the Big Piets, same applies.Now I have no more lead fouling problems.BarryNX973BP________________________________________________________________________________Subject: Pietenpol-List: Re: Gasoline questions
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Pietenpol-List: Re: Gasoline questions

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Original Posted By: "AircamperN11MS"
My brother has a Skyranger with 240 hours on the Rotax 912ULS running 93 octanewith 10% ethanol with no problems to date. We can't find any gas without ethanolin it. The only difference we can tell between the non-ethanol and the 10%ethanol is it takes a little more per hour but not much more. He has been runningthe 10% ethanol since 2007.--------Jerry Dotson59 Daniel Johnson RdBaker, FL 32531Started building NX510JD July, 2009wing, tailfeathers done, fuselage rollingusing Lycoming O-235Read this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: Gasoline questions
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Pietenpol-List: Re: Lead on Skark plugs.

Post by matronics »

Original Posted By: "Jerry Dotson"
I didn't think you would catch on to my secret. Yes, the chickens have wings andwings create lift. That's why my plane climbs so well. Want to know another secret? If you remove the inspection plates from the bottomof the wings and then fly upside down, All the lift will fall out. Not good!Secrets are out.--------Scott LiefeldFlying N11MS since March 1972Steel TubeC-85-12Wire WheelsBrodhead in 1996Read this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: Lead on Skark plugs.
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Re: Pietenpol-List: Re: Gasoline questions

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Original Posted By: Jerry Dotson
Subject: Re: Pietenpol-List: Re: Gasoline questionsNW Oklahoma all the stations have signs that say 100% Gasoline No ethanol. SanAntonio, Texas you can't find ethanol free gas.----- Original Message -----
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Pietenpol-List: Re: Osh - Brodhead

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Original Posted By: "K5YAC"
Is anybody going up to OSH after Brodhead. It would be nice to a group fly thing like 2 years ago. I am going up on Sun am. if weather is good.Dick N.________________________________________________________________________________Subject: Pietenpol-List: Re: Osh - Brodhead
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Re: Pietenpol-List: Osh - Brodhead

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Original Posted By: dog67(at)aol.com
My family and I are going up, but we'll have to wave to you from Hwy 151. :-(--------Mark ChouinardWings, Center Section and Empannage framed up - Working on FuselageRead this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Re: Pietenpol-List: Osh - Brodhead
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Post by matronics »

Original Posted By: Dick N
I am, but my Piet is still under construction, so it'll be in the yellow plastic plane.But will still be drooling over the "real" planesCheersJon Apfelbaum(Glastar N767JA)-----Original Message-----
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RE: Pietenpol-List: Osh - Brodhead

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Original Posted By: owner-pietenpol-list-server(at)matronics.com
Me too. And I think Matt Paxton will bring his new ship there afterBrodhead. Randy Bush was talking about going as well, if we could get agroup going.Jack PhillipsNX899JP "Icarus Plummet"Smith Mountain Lake, Virginia _____
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Pietenpol-List: Osh - Brodhead

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Original Posted By: jeff wilson
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Re: Pietenpol-List: Re: Cloudcars Prop Performance

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Original Posted By: Ryan Mueller
Subject: Re: Pietenpol-List: Re: Cloudcars Prop Performance
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Pietenpol-List: Re: Osh - Brodhead

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Original Posted By: "K5YAC"
You guys are making me want to just burn all my vacation time and go to OSH too!Hmmmm... decisions...decisions!Don EmchNX899DERead this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: Osh - Brodhead
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Pietenpol-List: Re: Gasoline questions

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Original Posted By: "AircamperN11MS"
I don't believe it! This is Raven Field, in the CFS ( CanadaFlight Suppliment) as Quamichan Lake. Field elevationis only 130' and runway length is 1800'. This isSouthern Vancouver Island, BC. The owner is John Howroyd.John's dad built Pietenpol CF-AOG in '32.http://www.ourairports.com/airports/CML ... /cml2.html It's a 108-3, with an 6A4-165-B3 Franklin in it. Go to http://tinyurl.com/3hx847q A short, but instructional, video concerning planning your takeoff.. Oscar Zuniga________________________________________________________________________________Subject: Pietenpol-List: Re: Gasoline questions
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Pietenpol-List: Re: Gasoline questions

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Original Posted By: "AircamperN11MS"
Mine are a little different. They're internally mounted to prevent flutter atthe high speeds. Kind of the ping pong ball effect.--------Scott LiefeldFlying N11MS since March 1972Steel TubeC-85-12Wire WheelsBrodhead in 1996Read this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: Gasoline questions
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