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Tractor Pulling Discussion Forum

jd 70 gas

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Tyler Neff

08-31-2003 10:20:21




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I pull a jd70 gas with an LP manifold on it .Im having trouble with it freezing up. Does anyone know what to do ? Im running straight Tubo Blue racing fuel.




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buickanddeere

08-31-2003 19:21:16




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 Re: jd 70 gas in reply to Tyler Neff, 08-31-2003 10:20:21  
How much mechanical compression ratio, cam timing and cranking pressure? That much octane maybe loosing HP. The turbo Blue may contain alcohol which eats steel & aluminium. Alcohol is noted for frosting manifolds. 100LL aviation fuel is less prone to freezing carbs. Aviation fuel is superior in long stroke engines than car fuel made for high rpm short stroke engines.



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ChadS

08-31-2003 19:47:24




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 Re: Re: jd 70 gas in reply to buickanddeere, 08-31-2003 19:21:16  
Does turbo blue have methanol, or ethanol in its mixture?? ChadS



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Chads

08-31-2003 15:38:26




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 Re: jd 70 gas in reply to Tyler Neff, 08-31-2003 10:20:21  
Frosting of the manifold is a good thing, in my opinion. the cooler the air fuel mixture in the manifold, the more power and torque the engine will make. When I rework a carb and tune it with the dyno, that is the first thing that happens. It sweats, and or frosts over above the carb. Does the frost affect the way it runs on your 70??? Chads



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Tyler Neff

08-31-2003 17:58:48




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 Re: Re: jd 70 gas in reply to Chads, 08-31-2003 15:38:26  
My cam might be giving me some crap too .Im not sure what the specs are on it. Kieth Merfeld had it made but im not sure if its up to par.Does anybody have a good design for a jd70.I have a good design for a G but im not sur if it would work on a 70



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ToddF

09-02-2003 06:55:06




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 Re: Re: Re: jd 70 gas in reply to Tyler Neff, 08-31-2003 17:58:48  
The cam shaft lobe grinds for late model A thru 620 are the same, although the shafts are a different length. I suspect that G thru 720 would be also. There are a few places that will grind a "pulling cam", but I'd suggest they provide you some details about what the grind is and how it differs from stock before buying one. I prefer more than hearing "I ground one for a guy and he said it pulled real good." Kieth Merfeld does good work by my experience. I've had him notch cams for me, but never reground one.

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Chads

08-31-2003 18:15:54




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 Re: Re: Re: jd 70 gas in reply to Tyler Neff, 08-31-2003 17:58:48  
A 70 is much like a 730. I think the cams are a bit different grind between the two. The 30 series tractors, I think are some of the best 2 cyls JD built towards the end, before the new generation power came out. I belive if you use a 30 series cam grind to start with, especially in the older 2 lungers, like the A-G, You can bore it, stroke it, and put it together and not be right. My opinion is that it is cam related. As far as exact figures, on bore and stroke, it is up to you on how big you go. Assembly of the engine is a difficult task, but the fine tunning is even harder. ChadS

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Tyler Neff

08-31-2003 17:52:49




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 Re: Re: jd 70 gas in reply to Chads, 08-31-2003 15:38:26  

Im not 100% sure what the h&%$ going on in there.Can it freeze on the inside as well?



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ChadS

08-31-2003 18:04:50




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 Re: Re: Re: jd 70 gas in reply to Tyler Neff, 08-31-2003 17:52:49  
No, just at the carb mounting plate, and the manifold. The venturi, is mixing the air fuel ratio, and is creating a cooling effect, Turbo blue racing fuel will make it frost up every time. What have you done to the carb? Have you dyno tunned this carb??? Chads



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