Posted by John T on November 06, 2012 at 04:28:59 from (216.249.82.117):
In Reply to: True Horse Power posted by Idaho spud on November 05, 2012 at 21:40:15:
Horsepower is a function of Torque x RPM, thats why the HP rating is quoted at X RPM. A small lawn mower engine with a short stroke obviously doesnt have much Torque, so to get much HP it runs at a fast RPM such as say 3600 versus a long stroke higher torque engine that only runs at maybe 1000 RPM..... The old 2 banger Johnny Poppers ran at low RPM but had a longgggggggggg stroke which gave them their torque so they could develop perhaps 40 HP at 1200 RPM
HOWEVER the same vintage screaming 6 cyliner Olivers didnt have as much Torque and a shorter stroke butttttttttt they got say 40 HP cuz they ran at a much faster RPM Get it?????????
HP is a function of Torque x RPM and thats the bottom line
I have to agree with the antecdotal evidence, my old John Deere B is rated at like 13 HP, while my lawn mower is 25, so gear them down and weight them however it takes and I just dont see the 25 HP engine ever outperforming (actual work) the 13 HP Deere??????
Last thought, HP in todays world may be part hype like when they started rating power amplifiers at 40 watts which were only maybe 20 watts a few years earlier?????
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 - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
... [Read Article]
Latest Ad:
2022 John Deere 5045E, 4wd, front end loader and 3rd function with grapple. 120 hrs, 55k new, must sell
[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.
