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Farmall & IHC Tractors Discussion Forum
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Fuel viscosity

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Bill in Orono,

02-04-2004 15:19:28




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Is gasoline thinnner (less viscous) than say 50 years ago? I ask as I sucessfully run my 300 Farmall with the adjustment screw in several turns from the "5" the manual calls for. At Five she's smokin, occasional flame at the stack. Granted the flame is cool, but soot is everywhere if I keep it like that for a while.

I know octane rating is much higher.

Thanks for you input.




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JPY

02-05-2004 10:06:53




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 Re: Fuel viscosity in reply to Bill in Orono, MN, 02-04-2004 15:19:28  
Gasolene end point is 430 degreed ferinheit. Most refiners shoot for 425 all the time. Very difficult to move gasoline into kerosine as gasoline flash point is 60 degrees and kero is 120 degrees. Kero flash is held up due to use in jet engines. If you try to shift gasoline into kero the flash gets you first.



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jed

02-05-2004 11:15:25




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 Re: Re: Fuel viscosity in reply to JPY, 02-05-2004 10:06:53  
Your are not moving the flash point to the kero. Your are adjusting the end point to lower the end point to max fuel production. Gasoline with RVP gets the RVP from Butane, which goes from a gas to a liquid at 33 degrees F. I don't know where you are coming up with the 60 degree flash point for gasoline, but I feel certain you would blow your head off testing the flash point of gasoline. It flashes at - numbers. Your info on end point always being 425 is wrong. Have you checked the gasoline you are buying? My guess would be that you haven't. We do it everyday for clients at the fuels testing lab. My opinion is based on 20 plus years of refinery and lab testing experience, for what that it is worth.

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Jed

02-05-2004 09:52:19




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 Re: Fuel viscosity in reply to Bill in Orono, MN, 02-04-2004 15:19:28  
Gasoline today is usually less viscous than it was 30 years ago. At this time of the year the refiners are making more fuel than gasoline because that is where the market is. More of the heavy end of gasoline is passed off into the diesel range and the gasoline becomes lighter. Also the composition of gasoline has changed greatly in the last 20 years, gasolines are now made for injector systems, not carbs. I don't know why everyone thinks valves have such high lead requirements. Think about it if you will, these tractors were designed to run on kero, which had no lead in it. Whatever lead they got came from a little bit of starting gasoline. What you are probably facing is a carb jet that is eroded, if it is the original, or a poorly made copy of one.

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JPY

02-05-2004 07:56:43




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 Re: Fuel viscosity in reply to Bill in Orono, MN, 02-04-2004 15:19:28  
Gasoline could be slightly less viscous as today it could have ethanol or MTBE in some places yet in the blend. You would have a hard time measuring the difference. One thing for sure is gasoline today has less butane in it for smog control reasons.Much lower allowed RVP. Butane was what made the engines easier to start.Winter gasolines today have the RVP of the old summer gasolines. This is why alot of you are seeing the harder winter starting.I worked at a refinery and have blended a lot of gasoline!

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Bill Orono MN

02-04-2004 19:44:31




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 Re: Fuel viscosity in reply to Bill in Orono, MN, 02-04-2004 15:19:28  
When it warms up I will check the float. Thanks gentlemen



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CNKS

02-04-2004 18:32:18




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 Re: Fuel viscosity in reply to Bill in Orono, MN, 02-04-2004 15:19:28  
The Super H-up had a fixed main jet with a needle to lean the mixture if you did not need max power--done to improve fuel economy. Doubt if it's the gas, your float may be too high.



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riverbend

02-04-2004 16:21:08




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 Re: Fuel viscosity in reply to Bill in Orono, MN, 02-04-2004 15:19:28  
How is the idle adjustment ? Any chance that your air cleaner is restricted ? After 40 years, your tractor may have a different carb or main jet.



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old

02-04-2004 15:42:56




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 Re: Fuel viscosity in reply to Bill in Orono, MN, 02-04-2004 15:19:28  
No it was not thinner but it had lead in it and the octane level was a whole lot higher then. As far as adjustments that is just a starting point all engines have differant thing about them just as all carb do. One engine may run good at 5 turns but the next may need 7 or even 2, thats the reason you can adjust things



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Jay

02-04-2004 19:07:51




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 Re: Re: Fuel viscosity in reply to old, 02-04-2004 15:42:56  
the gas of old had no more octane than today - lead was the only difference. Lead did have some stability and lubricity advantages, but that was it. Increased octane can give a false sense of an engine performing well. It will give you better starts and decreased ping, but well adjusted timing will do the same.



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Wayne Swenson

02-04-2004 20:45:44




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 Re: Re: Re: Fuel viscosity in reply to Jay, 02-04-2004 19:07:51  
Actually, higher octane rated gasoline starts harder than a lower octane fuel.
The octane rating is a measure of the resistance to detonation in the combustion chamber; that is accomplished by SLOWING DOWN the combustion process in a more controlled manner.
Come on up to Minnesota on a cold day and see if your high octane fuel starts better when it is -35 degrees!!



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Bill in Orono, MN

02-04-2004 21:20:43




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 Re: Re: Re: Re: Fuel viscosity in reply to Wayne Swenson, 02-04-2004 20:45:44  
MN eh? Where about?



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