Posted by RodInNS on October 24, 2014 at 10:58:47 from (216.118.158.123):
In Reply to: drawbar vs engine posted by mb58 on October 24, 2014 at 07:39:17:
Gross engine power is always the largest number followed by net flywheel hp... and the numbers that manufacturers use vary between those two today... Both are really quite meaningless because neither one considers the parasitic loss in the drivetrain. I would say on most tractors in the 60-100 hp class... PTO power will be in the 85% range of net flywheel power. Drawbar power will be in the low-mid 70% range. On the lower end for bias tires and on the upper end for radial tires with an easy 2-3 point spread between them on the same tractor. Personally I just laugh at net flywheel numbers because they don't mean anything. I can show you tractors that have a 10% margin on net flywheel power that make the same drawbar power due to drivetrain efficiencies in on over the other. The gap is not so wide with PTO power but it's still there... I don't take Nebraska or OECD numbers as the be all, end all of tests either... but when interpreted for what they show they are quite meaningful. The main area that I think they err somewhat is in the fuel efficiency numbers... in that while they do show which is most efficient at maximum power they do not necessarily mimic real world usage conditions where the torque curve of some engines will result in a lower gph consumption rate for a particular job even though the full power efficiency is somewhat less...
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
... [Read Article]
Latest Ad:
For sale Farmall super A tractor is complete and has just been setting for awhile,it was running when pulled out of the barn,shouldn’t take to much to get it going asking 1100.00
[More Ads]
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.
