|
Tractor Talk Discussion Board |
Re: OT: Real world Diesel Mileage?
[ Expand ] [ View Follow Ups ] [ Post Followup ] [ Return to Forum ]
Posted by Bob M on August 17, 2005 at 07:24:00 from (151.190.254.107):
In Reply to: Re: OT: Real world Diesel Mileage? posted by Hugh Mackay on August 16, 2005 at 18:39:41:
Indeed Hugh! I was thinking a max legal GCW combination with a 14L engine. Obviously a 466 and a lighter load will do much better. ---- You and Rod F have both touched on the major reason the current crop of diesel pickups give the fuel mileage figures they do - Weight to HP ratio. Consider this: A typical P/U might weigh 5,500# and have 250 HP – that’s about 22 lb per engine HP. On the other hand for an 82,000# tractor trailer with “typical” 450 HP engine it works out around 182 lb/HP. That’s a substantial difference! NOW if you were to build a pickup with a weight to HP ratio on par with the big rig it would have about 30 HP under the hood (and also a 10 or 13 speed manual transmission). This theortical outfit would probably be capable of 40+ mpg. But it’s unlikely few people would accept the sluggish performance and the constant manual gear changing required. (Or look at it the other way: The OTR truck would require whopping 3,725 HP engine… ….you’re talking railroad locomotive prime mover here….to equal the weight/HP ratio of the typical diesel pickup. Think THAT outfit would give 15 mpg?!!) The bottom line is it’s a tradeoff: Performance vs economy. The light truck market has demanded performance over economy, and the car companies have responded. ---- Incidentally you are right about the pulling ability of the 250 with a Super M on the flatbed Hugh. It walks it up hills almost as easily 1,500 RPM same it as at 2,500 - only difference is less noise!
Follow Ups:
Home
| Forums
Today's Featured Article -
An AC Model M Crawler - by Anthony West. Neil Atkins is a man in his late thirties, a mild and patient character who talks fondly of his farming heritage. He farms around a hundred and fifty acres of arable land, in a village called Southam, located just outside Leamington Spa in Warwickshire. The soil is a rich dark brown and is well looked after. unlike some areas in the midlands it is also fairly flat, broken only by hedgerows and the occasional valley and brook. A copse of wildbreaking silver birch and oak trees surround the top si
... [Read Article]
Latest Ad:
18-32 Case Cross Motor
[More Ads]
Copyright © 1997-2025 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 |
|
