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Tractor Pulling Discussion Forum

Jd G's disadvantage?

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al

03-21-2004 16:58:58




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Seriously explain why 2 cyls are so mach a disadvantage? 1400 rpm with 830 cu in only needs a 330 cfm carb?
I know doubling the rpm may more than double the carb size but they still seem to come down to around 900 rpm and do there best.

Is there a limit are as far as "piston speed" with a long stroke motor?




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Wild Horses

03-22-2004 08:14:53




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 Re: Jd G's disadvantage? in reply to al, 03-21-2004 16:58:58  
Go to Northern Missouri & try to tel those guys that JD are disadvantaged. The truth is nothing else can lug like a 2 cyl, b/c of that flywheel. How many big Olivers & Farmall's fo you see lug pratically to a stall w/o blowing th head that is.



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JD2830

03-22-2004 06:28:43




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 Re: Jd G's disadvantage? in reply to al, 03-21-2004 16:58:58  
The 2 cyls has 540 degrees of coast rotation between power strokes. Take any other brand and put 540 degrees of coast inbetween power strokes and see how much of a dog they are.



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Paul

03-21-2004 18:25:36




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 Re: Jd G's disadvantage? in reply to al, 03-21-2004 16:58:58  
the disadvantage of the two cylinder is this.the cab size mentioned should actually be 660cfm. why figure this way using same carb you could run another 2 cylinders during the 540 degrees crank rotation that the two cyl. does not fire also unless using a duplex carb intake and head one cylinder has tendency to run richer or leaner than other which costs some performance. also on big cube g's( or others)withpower block type setup the piston is considerably bigger than the top of block and head where valves are.that creates a choke type condition.if you could get that area bigger and use valves closer in comparison to piston dia( maybe 3 3/4" and 3 1/4") much more could be had. maybe 4 valves per cylinder? but if you had valve sizes that big your gonna need a carb that is three inches plus in Dia. now lest I suffer the wrath of deere lovers, I am john deere through and true.but they have some diadvantages in open class pulling.but they raise eybrows quite regularly in other than open class pulling.Paul

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The Rodent

03-21-2004 17:04:36




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 Re: Jd G's disadvantage? in reply to al, 03-21-2004 16:58:58  
2-cylinders arn't a disavantage, I have a JD G, and a A. And I've beat the hot tractors. There just move slower down the track.



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al

03-21-2004 17:19:19




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 Re: Re: Jd G's disadvantage? in reply to The Rodent , 03-21-2004 17:04:36  
What I meant was why do you have to have so many cubes and still peak outat 125 hp.



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buickanddeere

03-21-2004 20:00:15




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 Re: Re: Re: Jd G's disadvantage? in reply to al, 03-21-2004 17:19:19  
The two cylinders were built to burn the cheap left over stuff that refineries didn't know what to do with and had little market to sell in. They atomize/vaporize and burn low octane fuel oils. A small carb with small venturies making a very strong signal was required to lift the thicker fuel and break it into a spray. The air/fuel mixture was draw at high velocity and mixed with turbulance through small, very hot ports and past and eye-brow shrouding the side of the intake valve to introduce more swirl. The cam timing was kept very short to extract all the pressure over the longest period of time to obtain more (work) from the fuel. The compression ratio was about 4.25 to 1 to limit detonation from pre-heated low octane fuel.

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70 plowboy

03-21-2004 21:36:46




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 Re: Re: Re: Re: Jd G's disadvantage? in reply to buickanddeere, 03-21-2004 20:00:15  
IT`S funny they the redowners all cut down how slow a deere is and evrything else they can think of but if ya look back at what they were desinged to do run on fuel that no red tractor would even start on shure by todays standards they are at a disadvantage but back 50 years ago story changes a bit



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Exterminater

03-21-2004 17:18:57




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 Re: Re: Jd G's disadvantage? in reply to The Rodent , 03-21-2004 17:04:36  
Rodent from your past postings you sound very fimiliar. Were are you from?



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The Rodent

03-22-2004 14:21:51




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 Re: Re: Re: Jd G's disadvantage? in reply to Exterminater, 03-21-2004 17:18:57  
Eastern Kansas,you?



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