Posted by sotxbill on August 01, 2021 at 19:12:52 from (104.5.24.112):
In Reply to: Mileage question posted by rrlund on August 01, 2021 at 07:16:45:
Yes and no... The most efficient rpms for an engine will always at or below maximum torque. So... gearing the car to go as fast as possible with the engine close to max torque figure will generally get you there. And then factor in bearing drag, wind drag, and you seem to find that 40 to 60 mph are the sweet spots with the overdrive transmissions also based on gearing. Poor gearing can lower the sweet spot to 42 mph on a 2004 chevy impala as tested. engineers dont like to run the vehicle at its max efficiency because, the lest little hill or wind gust will slow the car down dramatically, so they tend to design it back down a bit for a fair reserve. When od came out, it immediately added around 3 mpg to most all vehicles, and extended engine life by 50%. Further aerodynamic designs, less weight, more gears to keep rpms down, electronic high voltage ignitions, computer controlled timing and mixture control, have allowed even another 6 mpg in cars. Once you exceed max torque, your trading rpm for power, and you loose mpg's exponentially. see https://www.mpgforspeed.com/ This uses wind drag only as a factor. With wind drag, if you double the hp, you will increase top speed by only 25% but increase fuel consumption by 125%... old rule of thumb. remember the fast the engine turns, the more power is lost of stopping the pistons going down, and then sending them back up. Where a rotary engine does not suffer this problem as much. Cam chains also suffer from the change of direction losses.
Upload one or more videos to your post. Photo and video filesizes should be less than 5MB. Formats allowed are gif, jpg, png, ogg, mp4, mov, and avi. Be sure to use filenames without spaces or special characters, and filetypes of 3 digits lower case.
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 - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
... [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]
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.
