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More 720 AllFuel questions

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Jonathan

04-11-2000 20:46:40




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Does anyone know the real difference between a gas 720 and an AllFuel 720? I know the allfuel has less horse power by 10-14Hp. What is the HP of the all fuel running on gasoline? Were the pistons different or the head? What has to be changed to get the allfuel up to the same HP as the gas tractor?

Thanks
Jonathan




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BUCKEYE AL

04-12-2000 10:14:17




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 Re: More 720 AllFuel questions in reply to Jonathan, 04-11-2000 20:46:40  
The engines of the all fuel and gas tractors are definitely different. The all fuel will not produce the same HP when it burns gas as will the gas tractor. If you put the "tractor fuel " or distillate in the gas tractor you'll probably only do it once! Under load, you'll hear the knock two townships away! The difference is primarily in the pistons. The distance from the crown to the center of the piston pin is much greater on the gas tractor than the all fuel. Put another way, when the piston is at TDC, the gas tractor's piston crown is much closer to the head than is the all fuel's piston. This distance between the head and the piston is what determines the compression ratio. The higher the compression ratio, the higher the HP. Engine efficiency also increases with the higher compression but only to a certain point. One other difference between the all fuel and gas is the manifold. The all fuel intake passageway is heated by the exhaust. This helpes vaporize the less volatile distillate fuel. The gas manifold by comparison is a cold manifold. Gasoline heated to too high a temperature slowly deposits carbon on the inside of the manifolds. I've seen all fuel A manifolds that have burned gas for decades, choked down to the size of a dime with these hard black carbon deposits! Deere used to sell AF to Gas conversion kits. You received a gas (cold) manifold, new high compression (higher than the all fuel) pistons, new rings, piston pins and all the gaskets and washers you needed to install them. When finished you had a more powerful gasoline powered tractor!

Hope this helps.

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Dave Wickman

04-12-2000 12:07:20




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 Re: Re: More 720 AllFuel questions in reply to BUCKEYE AL, 04-12-2000 10:14:17  
To add to BUCKEYE's very good discription the carburators were also jetted different but I was not aware of doing any changing to them during the conversion process.



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