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#21
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kennie be a b/sing agin.
I find it highly unlikely that there are no Oxygen (O) atoms in gas.... Matt "Ken" wrote in message ... One thing with ethanol is that the stuff contains oxygen atoms along with the hydrogen and carbon atoms, where as straight gasoline is hydrogen and carbon only. The oxygen tends to lean the mixture entering the engine. No matter what carb setting you apply after that, the air/fuel ratio never gets back to what it was. A lean mixture will burn hotter and more readily creates detonation and preignition (4 cylinders inboards tend to have dieseling problems with the stuff). It can also cause stalling problems. With cars the oxygenated fuels tends to work ok as the computers and sensors keep a good control. With marine engines its a problem. "Larry Weiss" wrote in message ... Both of my power boats have developed severe engine hesitation problems. They run okay at idle but sputter and stall when revved. My mechanics have complained that they are seeing this problem left and right - and are blaming it on the gasoline, which around here (Long Island, NY) now contains 10% ethanol. I know ethanol is not good for rubberized fuel lines, but did not know it caused running problems (unless the fuel lines are deteriorating and clogging). The gas in each boat was purchased at a different fuel dock. If my mechanics are correct, this is a serious regional (national?) problem. Anyone else experiencing difficulty? Any comments or suggestions? How can we get gasoline without ethanol in it? How is the marine industry addressing this? Larry Weiss "...Ever After!" "a little after..." |
#22
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#23
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#24
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schlackoff, you are even a worse chemist than you are a sailor. I suggest you
ask some high school kid to explain what happens to octane when you remove the oxygen. go stand in the corner. (Steven Shelikoff) Date: 9/23/2004 11:30 PM Eastern Daylight Time Message-id: On 23 Sep 2004 12:12:48 -0700, (Matt Lang) wrote: I find it highly unlikely that there are no Oxygen (O) atoms in gas.... There are, but tiny amounts. Gasoline is mostly hydrocarbon molecules, which like the name implies, is only hydrogen and carbon atoms. There are many of different types of hydrocarbon molecules in typical gasoline. However, there are also trace amounts of other compounds in there, some of which contain oxygen atoms as well as sulphur, nitrogen, some metals ... Steve |
#25
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JAXAshby wrote:
schlackoff, you are even a worse chemist than you are a sailor. I suggest you ask some high school kid to explain what happens to octane when you remove the oxygen. go stand in the corner. You should cut back on the amount of ethanol you drink, Jaxass. -- We today have a president of the United States who looks like he is the son of Howdy Doody or Alfred E. Newman, who isn't smarter than either of them, who is arrogant about his ignorance, who is reckless and incompetent, and whose backers are turning the United States into a pariah. What, me worry? |
#26
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With the stuff you get from the gas pump, ya, there is oxygen in the
formula. It is being put there by design for pollution purposes (EPA mandates) and for economic reasons (sometimes its cheaper to blend straight gas with something). At a chemical level, gasoline does not contain oxygen. The key word is formula. If only the powers that be would quit changing the formula. Carbs are limited range animals that can't fully handle all that difference. Engines demand a specific ratio of hydrocarbons to oxygen to produce optimum burn (or a richer mixture for optimum power). With a constantly changing formula, it becomes harder or impossible to adjust a carb to produce that optimum. For more info on gas see http://auto.howstuffworks.com/gasoline1.htm http://www.newton.dep.anl.gov/askasc.../chem99658.htm http://www.smokemup.com/tech/fuels.php "Matt Lang" wrote in message om... I find it highly unlikely that there are no Oxygen (O) atoms in gas.... Matt "Ken" wrote in message ... One thing with ethanol is that the stuff contains oxygen atoms along with the hydrogen and carbon atoms, where as straight gasoline is hydrogen and carbon only. The oxygen tends to lean the mixture entering the engine. No matter what carb setting you apply after that, the air/fuel ratio never gets back to what it was. A lean mixture will burn hotter and more readily creates detonation and preignition (4 cylinders inboards tend to have dieseling problems with the stuff). It can also cause stalling problems. With cars the oxygenated fuels tends to work ok as the computers and sensors keep a good control. With marine engines its a problem. "Larry Weiss" wrote in message ... Both of my power boats have developed severe engine hesitation problems. They run okay at idle but sputter and stall when revved. My mechanics have complained that they are seeing this problem left and right - and are blaming it on the gasoline, which around here (Long Island, NY) now contains 10% ethanol. I know ethanol is not good for rubberized fuel lines, but did not know it caused running problems (unless the fuel lines are deteriorating and clogging). The gas in each boat was purchased at a different fuel dock. If my mechanics are correct, this is a serious regional (national?) problem. Anyone else experiencing difficulty? Any comments or suggestions? How can we get gasoline without ethanol in it? How is the marine industry addressing this? Larry Weiss "...Ever After!" "a little after..." |
#27
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Uhhh, kinda embarrassed. Too long since high school, should have done my
research before spouting off... I'll back the other Matt now. Cs&Hs, no Os until you get into the additives etc. Been fooling around with wood chemistry too much. surfnturf snip the embarassment "Matt Colie" wrote in message ... Matt, Believe it. Of that stuff you call gasoline (those things that come of the the distillation between 100 and 200 degF) there is no chemical formulae. It is all organic hydrocarbon and the best they can due is provide a hydrogen/cardon ratio. And that is Gasoline... What gets added after that is anybody's bet. It isn't Tetraethyllead Pb(C2H5)4 anymore, but it can be any portion of a chemical alphabet soup (like MTBE, TAME and ETBE) with out even getting to the oxygenates. Most what was added in teh pst improved the octane rating. now what is added is largely to improve the combustion efficiency. Matt Colie (Engine Lab Rat -ret) |
#28
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#29
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#30
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dood, rather poor googling on your part. "octane", a physical fact, and
"octane rating", a concept, are not hardly the same thing. (modervador) Date: 9/27/2004 1:46 PM Eastern Daylight Time Message-id: (JAXAshby) wrote in message ... do a google (if you are capable) on the chemical makeup of octane and see how many oxygen atoms you find. Or you could look up the octane rating of methanol (about 100 on the (R+M)/2 scale) and its chemical formula (CH3OH) and note that a liquid fuel with a high octane rating can have as many oxygens as carbons. The octane number on the pump does not tell you how much "real octane" is in the gasoline. Extra credit exercise: look up octane numbers for "normal octane", "normal heptane" and "iso-octane" (a.k.a. 2,2,4-trimethyl pentane). %mod% |
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