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Post Info TOPIC: Cat vs Cummins


RV-Dreams Family Member

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Cat vs Cummins


At the risk of starting another brand war <grin> is there any major problem with either company's engines? I'm currently looking into DP rigs, and have seen both brands used. Since I know nothing about such, I thought I'd better ask. I know that there have been some issues with Ford's 6.0 diesel, and wonder if any of the bigger diesels have similar problems.

Flame suit is now on <grin>.

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David, kb0zke

1993 Foretravel U300 40'

Build number 4371



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No major differences.   I would avoid the Cat C9 engine since it was underpowered compared to the Cummins ISL and only used a couple years in motorhomes so they had trouble mating it with the Allison transmission.  But if the motorhome you find is a real deal make sure you have both the C9 and Allison computers revved to current levels and you should be fine.  C7 and C11 Cat engines have been commonly used in motorhomes, so don't worry about them.

Avoid Mercedes engines, they are built more for light duty than heavy duty. A diesel mechanic once told me if you accidently put gas in a Cummins, Cat or Detroit Diesel engine then you take it apart, clean it, replace the gaskets and it will run like new.  If you put gas in a Mercedes diesel you throw it in a dumpster

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Bill Joyce,
40' 2004 Dutch Star DP towing a 2012 Chevy Equinox
Journal at http://www.sacnoth.com
Full-timing since July 2003



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If anyone would know on this topic, it would be Bill J.  However, I will add one little item, should it be a concern to you.  From what I have heard, Caterpillar is no longer building engines for "over the road" for either trucks or motorhomes.

Than said, I cannot attest to any information as to parts and service available to the Caterpillar engines that are already out there.  I would have to believe that there is a network of "service" for them.  Thus, this is just a FYI comment.

Having been an 18-wheeler operator in the past, the Cat engines for the big trucks had good reputations.  (Once you got past the "break-in" period.)

Terry


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2010 Mobile Suites 38TKSB3
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Cat and Detroit Diesel bet on fancy engineering to get their engines working for the 2010 emissions without a urea tank and lost the bet. Since they have no engines that can meet the standards, they can't sell them for trucks and motorhomes. They will both be back in the over the road engines eventually, probably with urea tanks, there is just too much money to be made to stay out of it. Parts and service are no problem since both companies are in business and there are lots of engines out there.

All diesel engine manufacturers were looking at the 2010 emissions rules as a way to make money because they figured on selling lots of new engines so they did not put up a fight over the rules.

Edit: I mentioned Mercedes since some Freightliners Class A chassis have them inculding the late model Alfa See Ya Founder edition.  Bus conversions and high end motorhomes sometimes have Detroit Diesels.  Some new motorhomes might come with Navistar engines, the same company that made the lousy 6.0, so I don't trust them to be good engines.

-- Edited by bjoyce on Tuesday 22nd of February 2011 11:01:32 PM

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Bill Joyce,
40' 2004 Dutch Star DP towing a 2012 Chevy Equinox
Journal at http://www.sacnoth.com
Full-timing since July 2003



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Thanks, guys. This is precisely what I'm looking for.

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David, kb0zke

1993 Foretravel U300 40'

Build number 4371



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"Bus conversions and high end motorhomes sometimes have Detroit Diesels." I've been researching Wanderlodges, and that seems to be true of them. How are they, especially those of the late 90's? From what I'm reading on their forum, they seem to be getting 8-9 mpg @ 60 mph.



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David, kb0zke

1993 Foretravel U300 40'

Build number 4371



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kb0zke wrote:

"Bus conversions and high end motorhomes sometimes have Detroit Diesels." I've been researching Wanderlodges, and that seems to be true of them. How are they, especially those of the late 90's? From what I'm reading on their forum, they seem to be getting 8-9 mpg @ 60 mph.


 Back in the 60's - 70's Detroit Diesel was still  in the market pretty strong, but the standing story of the 318 hp and the 350 hp was that when Detroit came out with a new motor they would put it on an engine stand run it for 24 hrs then count the oil leaks, thus 318 and the 350 were born :).

 



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 2013 Montana BigSky 3582 RL

     

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