Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
Thread Tools Search this Thread Display Modes
Old 03-26-2007, 09:14 AM   #1
Senior Member
Ecker's Avatar
Join Date: Feb 2004
Location: South Carolina
Posts: 771
Here is link to Cummins presentation at FMCA in Perry


Ecker is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 03-26-2007, 09:14 AM   #2
Senior Member
Ecker's Avatar
Join Date: Feb 2004
Location: South Carolina
Posts: 771
Here is link to Cummins presentation at FMCA in Perry


Ecker is offline   Reply With Quote
Old 03-26-2007, 10:29 AM   #3
Senior Member
JavaJelly's Avatar
Newmar Owners Club
Join Date: Sep 2006
Location: North Java New York
Posts: 1,292

Thanks for the link. Godd and informative presentation. While I do trust the folks on this forum, it is always good to get reinforcement from the factory.

I do remember there being some disagreement on lugging being good for the engine or not. Apparently Cummins says it's better than high RPMs. If I recall Peter was right on.

Also, I didn't realize how much the cold negatively impacted MPG. Outside of the rolling resistance increase due to snow/water, I would have guessed better MPG because the engine is operating a cooler temp and the fan comes on less. Cummins says no.
Scott Crompton
07 Dutch Star 4304
Sue (DW)Celia 10, Alec 8, Bella (Greyhound), Isis (Abyssinian)
JavaJelly is offline   Reply With Quote
Old 03-27-2007, 04:16 AM   #4
Moderator Emeritus
Cruzer's Avatar

Join Date: Oct 2002
Location: Sheboygan, WI
Posts: 4,327
The lugging thing is kind of a carryover from the old days. AS far as fuel economy goes, it's always best to limit the revs. An engine is a big air pump and the faster it spins, the more air it pumps. Of course the air and fuel come through in a pretty much fixed ratio so if you keep the revs down you'll flow less fuel and get better economy.

In the old days lugging a diesel was not good for it. The detonation in the cyclinder would heat up piston tops and there was not enough airflow (which comes with higher RPM) to vent the heat out. This was tough on diesel engines. However, today's diesels are electronically controlled. If the various sensors detect that the combustion chamber is getting too hot it'll compensate by changing the fuel flow rate and/or injection timing. This makes a huge impact on longevity.
Mark & Leann Quasius
2016 Cornerstone 45A
2007 Allegro Bus 42QRP (Sold)
2012 Jeep Wrangler Unlimited - Rubicon
Cruzer is offline   Reply With Quote
Old 03-27-2007, 04:43 AM   #5
Administrator Emeritus

Join Date: Dec 2003
Location: Virginia Beach, VA
Posts: 9,491
Great posts from ecker and Mark...our "resident experts" on a lot of things related to engines....

That post from Scott thrown in there was like a "thorn between two roses"...

Hey Scott....June 4th in Nappanee buddy...Let the wife run Yogi and come on down!!
rebelsbeach is offline   Reply With Quote
Old 03-27-2007, 08:56 AM   #6
Community Administrator
Route 66's Avatar

Newmar Owners Club
Retired Fire Service RVer's
Spartan Chassis
Join Date: May 2000
Location: Newark, DE
Posts: 23,653
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Hey Scott....June 4th in Nappanee buddy...Let the wife run Yogi and come on down!! </div></BLOCKQUOTE>

Everybody who's anybody will be there!
Adios, Dirk - '84 Real Lite Truck Camper, '86 Wilderness Cimarron TT, previously 4 years as a fulltimer in a '07 DSDP

No trees were harmed in the transmission of this message, but millions of electrons were temporarily inconvenienced.

Route 66 is offline   Reply With Quote
Old 03-27-2007, 02:43 PM   #7
Senior Member
Jestme13's Avatar
Mid Atlantic Campers
Join Date: Feb 2006
Location: McVeytown, PA
Posts: 2,251

Steve, Pat, Hakbar, & Root Motor

2007 National RV Pacifica 36'
Jestme13 is offline   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
The Rally in Perry, GA Raca-roni RV Events & Gatherings 13 03-16-2008 12:08 PM
The Rally, Perry, GA Raca-roni Tiffin Motorhomes Owners Forum 5 03-09-2008 01:55 PM
"The Rally" Perry, GA Raca-roni Newmar Owner's Forum 5 10-24-2007 05:54 AM
Maxum Chassis Presentation vicsryd Winnebago Industries Owner's Forum 10 09-01-2007 06:50 AM
FMCA Perry GA Ted III Alpine Coach Owner's Forum 7 01-04-2007 10:00 AM

» Virginia Campgrounds

Reviews provided by

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 07:56 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.