Re: Re: Tractor Draw Bar HP!!

Posted by Bob M on July 02, 2004 at 14:15:47 from (165.170.128.65):

In Reply to: Re: Tractor Draw Bar HP!! posted by ags on July 02, 2004 at 07:19:22:

Good question! I guess the answer is “it depends”.

Looking at it from an engineering perspective consider this: 4WD indeed incurs higher driveline HP losses due to the extra gears, bearings, U-joints, etc. Also 4WD makes for a heavier tractor. These losses however can be offset by the reduced tire slippage and drive tire flex losses 4WD provides (you’re dividing the power among 4 driving wheels instead of 2).

Clearly 4WD increases a tractor’s overall pulling ability. However for heavy pulling in actual field conditions, I suspect 4WD does a slightly better job of delivering engine HP to the drawbar than 2WD. Otherwise why do virtually all tractors greater than about 150 HP have 4WD?

Incidentally engine torque in and of itself means nothing - you can get ANY torque you wish thru gearing. It’s engine HORSEPOWER (torque x RPM) that does the work!!

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