Tractor Talk Discussion Board |
Re: Horsepower Rating
[ View Follow Ups ] [ Post Followup ] [ Return to Forum ]
Posted by Steve - IN on January 18, 2003 at 10:21:17 from (12.222.17.160):
In Reply to: Horsepower Rating posted by Daniel T. Maxey on January 17, 2003 at 23:18:48:
Daniel, Yes, the rating scale has changed from '49 to now, but not in the direction you're expecting. In '71 the SAE engine dyno testing method added things like air cleaners and alternators while measuring horsepower on an engine dyno so the same engine had less HP. As G-Man said, there's also a difference in where you measure horsepower: flywheel, PTO, or rear wheels with a chassis dyno. There are also different scales: SAE, DIN, and Asian kW which give somewhat different results. There was a recent deceptive practice flap about Jaguar cars sold here using DIN ratings to make them look more powerful than an SAE rating would. The basic relationship is RPMxTorque=HP. So as G-man noted a slow turning M engine can have the same horsepower as a faster turning modern tractor - yet produce a whole lot more torque. That's why you see 8, 10, 12, etc speed gearboxes on the newer tractors versus the 5 speed on your M. I've got that trade off back in my barn. A JD 60 row crop and JD 1020 utility - rated within a few HP of one another. The 60 turns less than 1000 rpm, the 1020 nearly 3000 rpm. Simple math says the old 60 has about 3 times the torque of the 1020. So to make yourself feel better about the whole thing - compare the torque rating of your M against the newer machines. Steve
Follow Ups:
Home
| Forums
Today's Featured Article -
Show Coverage: Central Illinois Strawberry Festival - by Cindy Ladage and Janna Seiz. Every year the coming of summer is highlighted by different events for different people. For some, it is heralded with the end of school, tilling the garden, or completion of the planting season. To us, connoisseurs of find food, antique tractors, farm toys, crafts, and downright fun, the annual Strawberry Festival means summer is here. Every year, in Carlinville, Illinois, the Macoupin County Historical Society and the Macoupin Agricultural Antique Association team up to fill th
... [Read Article]
Latest Ad:
1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
[More Ads]
Copyright © 1997-2024 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 |
|