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Tractor Pulling Discussion Forum

JD70

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T

09-26-2005 06:50:50




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Pulled the new 70 in the 6500 open. I won by 32ft. Had a good time ,but could use some more fuel. Im gonna have to do some carb work. I got her down to 5500#. Might still be interested in selling or trading for restored oliver 1900.




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big jd

09-26-2005 16:27:14




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 Re: JD70 in reply to T, 09-26-2005 06:50:50  
HOW MUCH ARE YOU ASKING FOR THE 70 HOW MANY CUBES AND WHAT SHAPE IS IT IN



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T

09-27-2005 17:55:56




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 Re: JD70 in reply to big jd, 09-26-2005 16:27:14  
$9000 brand new engine some of it is primered and needs paint



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4010 puller

09-26-2005 15:12:26




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 Re: JD70 in reply to T, 09-26-2005 06:50:50  
T:

If you're interested in an Oliver 1900 restored, contact me as I have one. I have added my e-mail to this message.

Thanks,

John



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buickanddeere

09-26-2005 10:45:45




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 Re: JD70 in reply to T, 09-26-2005 06:50:50  
There is a conflicting message if I ever saw on. The carbs can be richened up via using jets for an all-fuel carb. How do you know she needs more fuel or are you blending in alcohol?



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T

09-26-2005 12:36:32




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 Re: JD70 in reply to buickanddeere, 09-26-2005 10:45:45  
I believe I already have drilled them out to about .0080 thousth



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T

09-26-2005 12:39:38




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 Re: JD70 in reply to T, 09-26-2005 12:36:32  
Oh, and I have my adjusting screw screwwed out all the way and Im still not getting any smoke. Thats how I know.



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Mike n Mo

09-26-2005 16:34:48




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 Re: JD70 in reply to T, 09-26-2005 12:39:38  
Are you using a fuel pump? The needle & seat is tiny on the duplex carbs. I drilled the jets on mine to 0.0625 and have plenty of fuel for 671 cubes. With 5/64" jets it was way too rich. I'm using a carter electric pump. My carb is stock, but I'm sucking off of both barrels at once. If the carb has been modified (bored out) and the venturi's aren't shaped correctly it won't suck fuel the way it's supposed to. Mike

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buickanddeere

09-26-2005 16:13:50




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 Re: JD70 in reply to T, 09-26-2005 12:39:38  
The seat internal dia can be bored larger and still leave a sufficient sealing surface for the needle. Some go so far as to adapt a Holley seat/needle for an alcohol carb into the duplex. The fuel tank sediment bowl has a screen that many people don't know it's there. If you spin the sediment bowl plug out and place a gallon container below. How long does it take to fill and is the stream of fuel solid or a dribble? If equipped with the engine oil fuel shut off. It or any other valve, orifice etc in the system can be partly plugged. The fuel bowl and vent system in the carb can cause grief if plugged, modified or if the bowl gasket seeps.

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buickanddeere

09-26-2005 16:13:03




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 Re: JD70 in reply to T, 09-26-2005 12:39:38  
The seat internal dia can be bored larger and still leave a sufficient sealing surface for the needle. Some go so far as to adapt a Holley seat/needle for an alcohol carb into the duplex. The fuel tank sediment bowl has a screen that many people don't know it's there. If you spin the sediment bowl plug out and place a gallon container below. How long does it take to fill and is the stream of fuel solid or a dribble? If equipped with the engine oil fuel shut off. It or any other valve, orifice etc in the system can be partly plugged. The fuel bowl and vent system in the carb can cause grief if plugged, modified or if the bowl gasket seeps.

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G/MAN

09-27-2005 15:40:42




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 Re: JD70 in reply to buickanddeere, 09-26-2005 16:13:03  
I think the oil-pressure shut-off on my "60" might disappear. I haven't decided yet. It's a good idea and they work well for keeping the crankcase gas-free if they're in good shape and the needle and seat or float give up, but they're definitely a restriction. They were also kind of touted as an "engine-saver" when the numbered-series came out, as they would shut the gas off it you lost oil pressure, and therefore stop the engine, but the fuel in the carb would allow the engine to run long enough to do major damage, I would think.

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Mike n Mo

09-26-2005 13:36:29




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 Re: JD70 in reply to T, 09-26-2005 12:39:38  
Are you using a fuel pump? The needle & seat is tiny on the duplex carbs. I drilled the jets on mine to 0.0625 and have plenty of fuel for 671 cubes. With 5/64" jets it was way too rich. I'm using a carter electric pump. My carb is stock, but I'm sucking off of both barrels at once. If the carb has been modified (bored out) and the venturi's aren't shaped correctly it won't suck fuel the way it's supposed to. Mike

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T

09-27-2005 16:34:21




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 Re: JD70 in reply to Mike n Mo, 09-26-2005 13:36:29  
No, Im not using a fuel pump . I believe the tractor is right around 733ci



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