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Tractor Pulling Discussion Forum

all fuel JD60 and racing gas

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BIG JAKE 60

03-10-2004 20:21:17




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I have a stock John Deere 60 all fuel tractor, with a hot coil and electronic ign. just wondering how much the high octane would help? The tractor runs good off of pump gas but looking for that extra 10 feet. any one ever mix any kerosene and racing gas? just looking for ideas thanks.




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John

03-11-2004 07:10:09




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 Re: all fuel JD60 and racing gas in reply to BIG JAKE 60, 03-10-2004 20:21:17  
I have to agree, hate to kill ur spirits but high octane fuel will cut you 10 feet or more. Be better off to run Jet A in it, Kerosene for the folks that think that is what they are buying for a $1 more, than to run the "good" fuel. Diesel/gas mixes work well too but smoke and eventually will soot up the motor and will get a few "experts" on here mad at you. The low compression motors like the all fuel were designed to make the maximum power on the distillant they were sold to burn. To get a decent push of the piston they rely on the slow burn time. Think of it this way, the high octane stuff will knock the heck out of the piston but only for a split second. The kero/JET A will not kick as hard, but will kick most of the way through the stroke of the piston there by creating more torque (ie. more power to turn the tires). Get the gas tank and selector working and put kero in the little tank. After the motor warms up and you are ready to pull switch over to the "starting" tank and make ur pull. Then go back to gas. Make sure you drain the carb after you switch it off if it hasn't ran long enough to get all the kero out of the carb. Makes it kinda hard to start.

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70 plowboy

03-10-2004 20:53:56




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 Re: all fuel JD60 and racing gas in reply to BIG JAKE 60, 03-10-2004 20:21:17  
BIG JAKE hate to ruin your day but the all fuels low 4-1 compression would probably run the best on the cheapest regular gas!! with that low compression youll be blowing most that race gas out the exhaust high octane needs high compresion to work properly it burns to slow and cold for such little compression some careful tuning with regular gas will take you farther than just rase gas ever will
plowboy!

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BIGJAKE

03-11-2004 14:16:19




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 Re: Re: all fuel JD60 and racing gas in reply to 70 plowboy, 03-10-2004 20:53:56  
I was told that these tractors ran a little weaker on kero. than reg gasoline



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G-MAN

03-11-2004 15:55:20




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 Re: Re: Re: all fuel JD60 and racing gas in reply to BIGJAKE , 03-11-2004 14:16:19  
It should make similar power on kerosene/distillate and low-octane pump gas, at least close enough that I doubt most PTO dynos would be able to tell the difference. The problem with running kerosene or other heavy fuel is that the engine has to be HOT to burn it efficiently. By "HOT" I mean 200 degrees or so. That's why all-fuel Deeres were equipped with shutters or curtains and manifolds that directed exhaust heat around the intake passages, to restrict airflow into the radiator and maintain engine temps hot enough to burn those heavy fuels well. At any temp much under that, you're not going to get a complete burn and are going to lose horsepower. It's going to be VERY hard to maintain that kind of engine temp idling around at tractor pulls, even with the shutters completely closed. Not to mention the possibility of contaminating your engine oil with unburned fuel. It took lower compression to run the heavy fuels, but kerosene has more BTUs per gallon, so the lower compression was pretty much offset by the fact that there was more engergy in the fuel. Also keep in mind that you're STILL going to have to have gas in the starting tank to run the engine long enough to get it hot enough to burn the kero. If you're going to put gasoline in that tank, you may as well put it in the main tank and be done with it. My advice would be to run 87 or 89 octane gasoline and forget about it.

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Mike in Mo

03-11-2004 15:06:53




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 Re: Re: Re: all fuel JD60 and racing gas in reply to BIGJAKE , 03-11-2004 14:16:19  
I have to agree with the above posts, use only the octane necessary to prevent spark knock/detonation. have done dyno tests with a modified engine and at least convinced myself of that. Do you know the history of the tractor? It's more than likely been overhauled in the last 50 years at some time and could have gas pistons in it. A compression could give you a clue-110 to 120 psi would be gas pistons, under 80 would be all-fuel (or a worn out engine). Just food for thought. Mike

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