Original Posted By: TomTravis(at)aol.com
A couple of months ago, someone asked a question about performance of auto fuel vs. 100LL. At that time I responded that I used both and didn't see much difference.However, I am now asking myself that question and looking for others opinions. I asked an A&P on the field today and he thought there may be a 10% difference in power.I noticed on a takeoff yesterday that on initial climb, I was only getting about 1980 rpm, I am used to seeing 2050. Engine was running smooth, mag check before and after was good.I should also add that I added 4 oz. of Marvel Mystery Oil to 10 gal. of fuel. I don't do that with every fill.Any comments?Dick N.________________________________________________________________________________
Pietenpol-List: fuel
Re: Pietenpol-List: fuel
Original Posted By: "gcardinal"
Subject: Re: Pietenpol-List: fuelI've run auto fuel in several airplanes from an L-19 to a Bonanza and couldn't tell any difference in power. Tom Travis________________________________________________________________________________
Subject: Re: Pietenpol-List: fuelI've run auto fuel in several airplanes from an L-19 to a Bonanza and couldn't tell any difference in power. Tom Travis________________________________________________________________________________
Re: Pietenpol-List: fuel
Original Posted By: Dick Navratil
I've noticed no difference between 100LL and premium auto fuel in the A-65.Greg C. ----- Original Message -----
I've noticed no difference between 100LL and premium auto fuel in the A-65.Greg C. ----- Original Message -----
Pietenpol-List: fuel
Original Posted By: Mark Blackwell
Re: Pietenpol-List: fuel
Original Posted By: "Mark Blackwell"
The debate re Mogas vs AVgas is often hot with the other usergroups. Some love it, some hate it. Bottomline-----Mogas is variable by region and by season. Mogas is in a state of change with the addition of alcohol. AVgas has yet to have this potential problem. Probably will in the future with the addition of alcohol. Alcohol in fuel can affect gaskets and seals in the fuel system. Winter formulas have different vapor pressures in Mogas. Test for yourself, if the Mogas you elect to use doesn't evaporate clean (no greasy residue) in clear glass dish, you may want to try this test with your local AVgas supply. Here in AK, AVgas is about $4.40/gallon. Even flying a lot of hours like ie. 200hrs/year at 7 gal/hr, that about $1400/yr pricing vs Mogas. Most of us have 10+ times that amount in our planes, most aircraft accidents are result of fuel problems, not an issue of plus or minus 10% power.Gordon----- Original Message -----
The debate re Mogas vs AVgas is often hot with the other usergroups. Some love it, some hate it. Bottomline-----Mogas is variable by region and by season. Mogas is in a state of change with the addition of alcohol. AVgas has yet to have this potential problem. Probably will in the future with the addition of alcohol. Alcohol in fuel can affect gaskets and seals in the fuel system. Winter formulas have different vapor pressures in Mogas. Test for yourself, if the Mogas you elect to use doesn't evaporate clean (no greasy residue) in clear glass dish, you may want to try this test with your local AVgas supply. Here in AK, AVgas is about $4.40/gallon. Even flying a lot of hours like ie. 200hrs/year at 7 gal/hr, that about $1400/yr pricing vs Mogas. Most of us have 10+ times that amount in our planes, most aircraft accidents are result of fuel problems, not an issue of plus or minus 10% power.Gordon----- Original Message -----
Pietenpol-List: fuel
Original Posted By: Rcaprd(at)aol.com
I should have also added to my post that the auto fuel I have used does not have ethanol. I also realize that possibly an old tach might not be the most accurate. Also, the sod runway after a few days of rain might require a bit more takeoff run.Dick N.________________________________________________________________________________
I should have also added to my post that the auto fuel I have used does not have ethanol. I also realize that possibly an old tach might not be the most accurate. Also, the sod runway after a few days of rain might require a bit more takeoff run.Dick N.________________________________________________________________________________
Re: Pietenpol-List: electric tachs
Original Posted By: Rcaprd(at)aol.com
Subject: Re: Pietenpol-List: electric tachsIn a message dated 8/28/2006 10:17:49 AM Central Standard Time, jboatri(at)emory.edu writes:How can these be installed so that a mag check can be done? That is, in one of the positions when the mag switch is turned to "Left" or "Right", won't the tach just go to zero because it's mag has been turned off?Jeff,IMHO I wouldn't want ANYTHING to be attached to the mags, simply because they are the life line of the engine. If the tach would short out, or somethingwould short the wiring, it would probably cause the mag to fail. Just simply not worth the risk. Chuck G.NX770CG________________________________________________________________________________
Subject: Re: Pietenpol-List: electric tachsIn a message dated 8/28/2006 10:17:49 AM Central Standard Time, jboatri(at)emory.edu writes:How can these be installed so that a mag check can be done? That is, in one of the positions when the mag switch is turned to "Left" or "Right", won't the tach just go to zero because it's mag has been turned off?Jeff,IMHO I wouldn't want ANYTHING to be attached to the mags, simply because they are the life line of the engine. If the tach would short out, or somethingwould short the wiring, it would probably cause the mag to fail. Just simply not worth the risk. Chuck G.NX770CG________________________________________________________________________________
RE: Pietenpol-List: Electric tach
Original Posted By:
Subject: Re: Pietenpol-List: Electric tachIn a message dated 8/28/2006 1:56:10 PM Central Standard Time, kmheidecpo(at)yahoo.com writes:Can you tell me the electrical output of the mags upon start-up and running. I am interested in using a voltage rectifier running off a mag which in turns provides a nice trickle charge back to a small motorcycle 12V battery. I am aware of the minimal drain on the battery however, I also plan on using ring gear and starter to fire up the engine. So any information as to the output isgreatly appreciated. I was under the impression the mag puts out a lot of chargewhen starting up and then maintains a 12 volt current. Right or wrong?Keep the mags totally independent of any other portion of the electrical system. Voltage is different than current. Mags put out a very high voltage,which causes the spark to jump across the electrodes of the spark plugs. However, the current is very low. You need current to charge a battery, and ifyou rob the mags of their limited current, you are asking for trouble.Chuck G.NX770CG________________________________________________________________________________Subject: RE: Pietenpol-List: Electric tachDate: Tue, 29 Aug 2006 06:45:20 -0400
Subject: Re: Pietenpol-List: Electric tachIn a message dated 8/28/2006 1:56:10 PM Central Standard Time, kmheidecpo(at)yahoo.com writes:Can you tell me the electrical output of the mags upon start-up and running. I am interested in using a voltage rectifier running off a mag which in turns provides a nice trickle charge back to a small motorcycle 12V battery. I am aware of the minimal drain on the battery however, I also plan on using ring gear and starter to fire up the engine. So any information as to the output isgreatly appreciated. I was under the impression the mag puts out a lot of chargewhen starting up and then maintains a 12 volt current. Right or wrong?Keep the mags totally independent of any other portion of the electrical system. Voltage is different than current. Mags put out a very high voltage,which causes the spark to jump across the electrodes of the spark plugs. However, the current is very low. You need current to charge a battery, and ifyou rob the mags of their limited current, you are asking for trouble.Chuck G.NX770CG________________________________________________________________________________Subject: RE: Pietenpol-List: Electric tachDate: Tue, 29 Aug 2006 06:45:20 -0400
Re: Pietenpol-List: fuel
Original Posted By: Dick Navratil
For what it's worth. I contacted EAA today and asked what their position is on using auto fuel in a Continental A65. Their reply was. "The FAA has approved the use of auto fuel in the C 65 and we find no fault in using auto fuel. In fact, we have the STC for auto fuel for those that fly standardcatagory aircraft. The STC for each airplane costs $1.00 per horse power." Being an experimental it does not need the STC.Gene----- Original Message -----
For what it's worth. I contacted EAA today and asked what their position is on using auto fuel in a Continental A65. Their reply was. "The FAA has approved the use of auto fuel in the C 65 and we find no fault in using auto fuel. In fact, we have the STC for auto fuel for those that fly standardcatagory aircraft. The STC for each airplane costs $1.00 per horse power." Being an experimental it does not need the STC.Gene----- Original Message -----
Re: Pietenpol-List: fuel
Original Posted By: Gene & Tammy
Hmmm. Let's do the math. C-65 at max. 5 gal/hr. Average flying time per year 100 hrs (thats 2 hrs/week year around, and that's a lot). 500 gals fuel per year. Average savings Mogas at $3.00/gal. vs AVgas at $4.00/gal. $1.00/gal. $500/year. Probably more like $100/yr savings for most of us due to limited flying season north of the Rio Grande. Heck, I waste almost that much in Skoal droppings. Known to have squandered that much in spilled liquid refreshments at the Down East Saloon as the Seahawks are getting worked over by the Steelers. Have hid at least 5 times that much in new airplane toys from sceptical tightwad Wifey.Gordon ----- Original Message -----
Hmmm. Let's do the math. C-65 at max. 5 gal/hr. Average flying time per year 100 hrs (thats 2 hrs/week year around, and that's a lot). 500 gals fuel per year. Average savings Mogas at $3.00/gal. vs AVgas at $4.00/gal. $1.00/gal. $500/year. Probably more like $100/yr savings for most of us due to limited flying season north of the Rio Grande. Heck, I waste almost that much in Skoal droppings. Known to have squandered that much in spilled liquid refreshments at the Down East Saloon as the Seahawks are getting worked over by the Steelers. Have hid at least 5 times that much in new airplane toys from sceptical tightwad Wifey.Gordon ----- Original Message -----
Pietenpol-List: fuel
Original Posted By: hvandervoo(at)aol.com
Pietenpol-List: fuel
Original Posted By: Jeff Boatright
Re: Pietenpol-List: fuel
Original Posted By: walt evans
I can answer partially the swollen gaskets question. Mogas has been using aromatic hydrocarbons like xylene and napthalene since they dropped tetraethyl lead as the antiknock additive. These high mol. weight aromatics change the partial pressures needed to vaporize the fuel compared to the normal fuel C-8 aliphatic hydrocarbon (heptane's first cousin), thus antiknock. These aromatics are added at diff rates depending on the region of the country and the season of the year. That's why the refineries are complaining about the EPA and State rules on Mogas formulas and why refineries are overloaded. Too many formulas for Mogas. Old leaded fuels didn't have these aromatics. Even 100LowLead AVgas doesn't. Problem is these aromatic hydrocarbons are dandy solvents for rubber gaskets of various flavors. Modern cars have modern plastics like teflon or viton seals in their fuel systems. Thus the puffy rubber gaskets in your old C-85. Old low and slow aeroplanes have to think twice about putting Mogas in an older fuel system. Alcohol and other ketones that are derived from corn/grain fermentation added to Mogas will only make the stuff a better solvent, thus future problems on down the road for all airplanes when they allow alcohol in the 100LL.Gordon ----- Original Message -----
I can answer partially the swollen gaskets question. Mogas has been using aromatic hydrocarbons like xylene and napthalene since they dropped tetraethyl lead as the antiknock additive. These high mol. weight aromatics change the partial pressures needed to vaporize the fuel compared to the normal fuel C-8 aliphatic hydrocarbon (heptane's first cousin), thus antiknock. These aromatics are added at diff rates depending on the region of the country and the season of the year. That's why the refineries are complaining about the EPA and State rules on Mogas formulas and why refineries are overloaded. Too many formulas for Mogas. Old leaded fuels didn't have these aromatics. Even 100LowLead AVgas doesn't. Problem is these aromatic hydrocarbons are dandy solvents for rubber gaskets of various flavors. Modern cars have modern plastics like teflon or viton seals in their fuel systems. Thus the puffy rubber gaskets in your old C-85. Old low and slow aeroplanes have to think twice about putting Mogas in an older fuel system. Alcohol and other ketones that are derived from corn/grain fermentation added to Mogas will only make the stuff a better solvent, thus future problems on down the road for all airplanes when they allow alcohol in the 100LL.Gordon ----- Original Message -----
Re: Pietenpol-List: fuel
Original Posted By: "Catdesigns"
Subject: Re: Pietenpol-List: fuelIn some areas alcohol is added to auto gas. It is the alcohol that will turn seals to mush.I ran alcohol in my go-kart and had to rebuild my carb every weekend.Howdy________________________________________________________________________________
Subject: Re: Pietenpol-List: fuelIn some areas alcohol is added to auto gas. It is the alcohol that will turn seals to mush.I ran alcohol in my go-kart and had to rebuild my carb every weekend.Howdy________________________________________________________________________________