Efficiency is a measure of the engine's useful work output per the amount of fuel consumed. As the load is increased the efficiency typically increases and becomes a maximum at about 80% of the engine's maximum output. As load is increased to greater than 80% the efficiency tends to decrease. At idle the engine is consuming fuel however, the engine is not connected to an external load. Since there is no useful work output, the efficency is zero. The only engine load is to over come friction, drive the cooling pump/fan, alternator, etc. Once an external load is applied we have useful work output and efficiency, however fuel consumption will increase to produce the additional power. In a similar manner as a truck's weight is increased the engine may be operating in a more efficient load range, however the fuel mileage will decrease due to the additional power production required.
Heavy truck engines are typically designed for lower RPM operation, which in part provides for increased life. HP = (torque x rpm) / 5252; if power is to remain the same then the engine's torque output must increase. The higher torque can be obtained by increasing the engine's displacement and/or cylinder pressure. Given equal HP of a high speed or low speed engine the driving force (torque at the rear alxe) can remain the same by selection of the proper gear ratios in the transmission/rear end.
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 - The David Brown Rose Badge - by Samuel Kennedy. In the 13th century civil war was raging in England. Two English noblemen were involved in a conflict which became known as the War of the Roses. The Duke of York had as his emblem a white rose and the Earl of Lancaster had a red rose. Today the white rose is the official emblem of the county of Yorkshire and the red rose has been adopted by the neighboring county of Lancashire.
... [Read Article]
Latest Ad:
1965 International Harvester McCormick Farmall cub tractor 2,500. Two owner tractor. My grandfather bought new in 1966, then we inherited it. Have all the paperwork original manual and all maintenance records. It starts and moves. Comes with underbelly mower, plough, and some other attachments.
[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.
