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Gasoline to air ratio?

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mgb

08-24-2000 20:19:52




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Some mechanic friends of mine were arguing the other day. How much air is required to burn one gallon of gasoline. This is of course in an engine. I believe there will be many variables to this question. Possibly to many to get an accurate answer. I'm sure things like bore size, rpms, and possibly even grade of fuel, to name a few, would all have an effect. Anyway, I told them I would post this on the YT discussion board and since I'm partial to JD, well I'm putting it on this board.

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Philip Croff

08-26-2000 07:57:55




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 Re: gasoline to air ratio? in reply to mgb, 08-24-2000 20:19:52  
In the John Deere dealer cartoon, Murphey Delivers the Goods, he was delivering an unstyled A. Murphey asked the son of the farmer how many gallons of air it uses for one gallon of gas. He said 8000, and said he learned it in school. It was in Two-Cylinder magazine a couple years ago. Whether it's right or not is debatable.



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clooney

08-25-2000 19:14:50




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 Re: gasoline to air ratio? in reply to mgb, 08-24-2000 20:19:52  
Mgb, old tractors run a little richer than modern high compression engines with 40,000+ KV ignition coils & large plug gaps... Starting (0*fahrenheit)=1 lb air to 2.5 lbs gas,,idle =11 lbs air to 1 lb gas,,power & speed =12 lbs air to 1 lb gas,,Economy =15.5 lbs air to 1 lb gas. So you can see there is no fixed answer. The vapor pressure & volatility of the gasoline will change these numbers slightly also.

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G Taylor

08-25-2000 20:08:52




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 Re: Re: gasoline to air ratio? in reply to clooney, 08-25-2000 19:14:50  
For putting around at shows and even working in the fields a 15-16 to 1 mixture is better. If pulling for that last snort of power, richen down to 13 or so to 1. Deere was ahead of their time with cyclonic combustion chambers, small ports with long runners,ability to heat the intake manifold and large efficient combustion chambers with high volume to wall area ratio. Even better with later duplex carburation when plugs were moved to the head. Most guys are afraid to warm an engine up to the required 180F to 195F for efficient gasoline combustion. The idea is to run a lean as possible rather than lots rich for slowest smoothest idle. Visable smoke are the unburned carbons going up the stack that haven't stayed to foul plugs and gum things up.

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John T

08-25-2000 07:35:41




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 Re: gasoline to air ratio? in reply to mgb, 08-24-2000 20:19:52  
Yeah I agre with David the ratio for good internal combustion under compression is 15 parts air to one part gasoline. As you know, burning (rapid oxidation) requires oxygen and thats how you extinguish a fire with an extinguisher as it prevents oxygen from gettin in contact with the heat and fuel source. No oxygen no burn but it will still burn (oxidize) with a lesser amount of air. If the combustion is not as complete, thats when you get more byproducts (soot, carbon, sulphur etc) which causes pollution. Ol John T

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david val

08-24-2000 20:57:15




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 Re: gasoline to air ratio? in reply to mgb, 08-24-2000 20:19:52  
the efficient ratio of fuel/air mixture in any gas engine is about 1 to 15 BY WEIGHT.if you can find out the weight of a , say a gallon of air, and the weight of a gallon of gas, you can calculate the volumetric ratio.



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G Taylor weight of air and pet peeve of over rich mixtures

08-25-2000 09:44:21




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 Re: Re: gasoline to air ratio? in reply to david val, 08-24-2000 20:57:15  
At sea level and 68F one cubic meter of air weights close to 1.3kg . Surprisingly heavy but that's what also holds a 800,000 lb 747 . One US gallon of gasoline would take roughly .0109 lbs of gasoline to burn at 14.7 to 1. 0.1744 ounces of gasoline by weight not volume. Idealy for economy and clean burning the mixture should have unused O2 left after combustion so a little leaner to 16 or so to 1 ratio. For max power a slightly rich mixture leaving unburned gasoline but using all the O2 works. Too rich and flame temperature drops and so does power. The smell and burning eyes will be your own fault. A rich mixture has a slower flame speed and requires more ignition advance as well. Some guys in order to get a cold engine without a thermostat, working shutters, intake manifold heat,old fuel and a worn engine will crank it rich. This does allow these louts to say " starts great hardly have to choke it" and allows a very slow and smooth idle. Problem it smokes,stinks,pollutes and rapidly wears the engine as the rings scape raw gasoiline off the cylinder walls into the oil. Same guys complain about fouled plugs and carbon build up.

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