|
Tractor Talk Discussion Board |
Re: Re: Re: Tractor Draw Bar HP!!
[ Expand ] [ View Follow Ups ] [ Post Followup ] [ Return to Forum ]
Posted by Bob M on July 02, 2004 at 08:32:50 from (165.170.128.65):
In Reply to: Re: Re: Tractor Draw Bar HP!! posted by txblu on July 02, 2004 at 06:52:50:
Mark � there�s several factors that affect differences between engine, drawbar and PTO HP ratings: Transmission type: Simple gear drive transmissions are the most efficient � they lose only a few % of the engine flywheel HP passing thru them. Powershifts don�t do quite as well. Hydrostatics are the worst � may lose as much as 15% - 20% of the engine�s flywheel power. PTO design: Depending on the mechanical design PTO output may be limited to some fraction of the available engine HP. Example: I�m uncertain of the exact numbers but recall working several years ago with an older Steiger equipped with a hydraulic PTO (PTO motor-driven from the tractor hydraulics). The engine was rated at 325 HP, but the PTO was limited to 120(?) HP. Doesn�t necessarily mean it�s an inefficient design � only that the PTO mechanism is incapable of safely transmitting full engine HP. Tires: Same as with cars, older (bias ply?) tires lose more to HP to slippage and internal flexing than do modern tractor radials. This can amount to a difference in several % in drawbar HP all other things being equal. Weight: As with any vehicle, the heavier it is the more power is required to move it forward. So if a tractor is overballasted during the drawbar test HP will unnecessarily be be lost simply moving the tractor along (though the effect of this one will be relatively minor overall). So simply comparing published HP ratings without consideration to stuff like the above CAN be misleading!
Follow Ups:
Home
| Forums
| Order Support
Today's Featured Article -
It Can't Be Done! - A Tractor Story - by Neil Campbell. I'll never forget the time back when I was a boy baling hay on our Farm in Big Rapid, Michigan. The most memorable event that took place was a trip up the steepest incline on the farm pulling an old New-Idea baler with a pony-motor for power and a haywagon. I had just talked my Dad into buying an old John Deere B with 6-speeds ahead and I was real proud of it, except it was a little smaller than the Case tractor that we normally
... [Read Article]
Latest Ad:
Late 50s early 60s international harvester 560 with cultivator
[More Ads]
Copyright © 1997-2026 Yesterday's Tractor Co.
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V. Yesterday's Tractors - Antique Tractor HeadquartersWebsite Accessibility Policy |
|
