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03-26-2007, 09:14 AM
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#1
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Senior Member
Join Date: Feb 2004
Location: South Carolina
Posts: 808
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Here is link to Cummins presentation at FMCA in Perry
Cummins
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Ecker
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03-26-2007, 09:14 AM
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#2
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Senior Member
Join Date: Feb 2004
Location: South Carolina
Posts: 808
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Here is link to Cummins presentation at FMCA in Perry
Cummins
__________________
Ecker
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03-26-2007, 10:29 AM
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#3
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Senior Member
Newmar Owners Club
Join Date: Sep 2006
Location: North Java New York
Posts: 1,300
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Ecker,
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) 
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03-27-2007, 04:16 AM
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#4
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Moderator Emeritus
Join Date: Oct 2002
Location: Sheboygan, WI
Posts: 2,567
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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.
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Mark & Leann Quasius
2007 Allegro Bus 42QRP - Cummins 400 ISL
2012 Jeep Wrangler Unlimited - Rubicon
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03-27-2007, 04:43 AM
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#5
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Administrator Emeritus
Join Date: Dec 2003
Location: Jupiter, FL
Posts: 9,933
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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!!
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03-27-2007, 08:56 AM
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#6
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Community Administrator
Newmar Owners Club
Join Date: May 2000
Location: Newark, DE
Posts: 13,895
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<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! 
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Adios, Dirk - '84 Real Lite Truck Camper, '86 Wilderness Cimarron TT, '07 DSDP, '11 Virtual RV
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03-27-2007, 02:43 PM
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#7
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Senior Member
Mid Atlantic Campers
Join Date: Feb 2006
Location: McVeytown, PA
Posts: 2,278
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66,  
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Steve, Pat, Hakbar, & Root Motor
2007 National RV Pacifica 36'
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