Posted by jdemaris on November 05, 2009 at 15:20:33 from (67.142.130.11):
In Reply to: Re: pickup trucks?? posted by rustyfarmall on November 05, 2009 at 13:52:20:
It would be nice if it always worked that way, but it does not. Yes, a small engine has to work harder to keep up with a big one. But, when cruising, at low load, a small engine can use less gas if set up properly and running within its peak torque curve. Very easy to verify. Just check the EPA highway figures with same vehicles, same gearing, and different size engines. Also, when there is more power available, it often gets used.
By your reasoning, a 1/2 ton pickup with a 454 big block, when cruising on a flat highway at 65 MPH, could get the same fuel mileage as the same 1/2 ton truck with a smaller engine that was just adequate to maintain that speed. Rarely works that way- althought I've been hearing such claims for over 50 years. I had such a truck (with a 454), and it got a best of 13 MPG on highway cruises, but 11 was more the usual. Stuck in a 283 and got 17 MPG with it.
Put an engine in a vehicle that's so underpowered that it's laboring all the time or revving way out of its torque-curve, and it's a different story. I had a 21 foot Dodge Champion motorhome that got a best of 6 MPG with a 318 V-8. Stuck in a 383 and got 9 MPG. One of the reasons why the older Dodge 5.9 Cummins diesels got better fuel mileage than the 6.2 GMs and Ford-IH 6.9s/7.3s at the time was because it was the smallest engine and could behave like a bigger engine, when necessary - due to a lot of turbo boost and a long stroke.
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 - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
... [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.
