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John Deere Tractors Discussion Forum
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engine torque?buickanddeere

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John51

11-14-2004 18:23:00




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A while ago you posted the torque numbers for some two cylinders compared to the new generation tractors. I tried to search but couldn't find it. Could you post them again or tell me where to find that information?
Thanks, John




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buickanddeere

11-15-2004 08:25:39




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 Re: engine torque?buickanddeere in reply to John51, 11-14-2004 18:23:00  
There was an excellent reproduction of the 30 series industrial tractor HP and torque specs in this past summer's issue of "Two Cylinder Magazine. Might get lucky and be able to order a back issue. It's a keeper. In brief the ports are long and small dia. They are really starting choke off flow at peak HP. However they ram the combustion chamber fuller at lower rpms to increase combustion chamber pressure/ torque output. Part of the reason some "math dropouts" claim their two cylinder has more "power when lugged down". Isn't so, they have more power at rated rpm and more torque when lugged to about 2/3 of rated rpm. In short do as the factory engineers requested in the operator's manual. Operate at full rated rpms and at 80% average full load. The reserve is for tough spots and hills. Not for 110% continuous duty. They burn cleaner and charge the batteries better too. Drive train and engine stress is also reduced with reduced torque loading. I've tried to explain this one to a few at shows to those who are pounding along at 600-700rpm under load. Gets the "blank and confused look" pretty fast. Even tried to compare it to riding a bicycle in too high a gear. Blank look again and he said any bike he ever road was a single speed.

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720Deere

11-15-2004 07:58:15




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 Re: engine torque?buickanddeere in reply to John51, 11-14-2004 18:23:00  
Finding the torque value is as simple as knowing the horsepower and the rpm at which it is achieved, then apply the standard formula. HP= (Torque x RPM)/5252 If you know the HP, then you would use Torque = (HP x 5252)/RPM

If your HP was 90 @ 1900 RPM then your torque would be 248.78 ft/lbs.



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John51

11-15-2004 16:45:59




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 Re: engine torque?buickanddeere in reply to 720Deere, 11-15-2004 07:58:15  
Thanks



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