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Author Topic: What's the difference between Cummins diesel and Cat diesel.  (Read 895 times)

15 razor xp

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-Looking into buying a DP motorhome for the purpose  going full time RV's. Been looking at 37ft. to 40ft. ,notice some have Cummins and others have Cat diesel. What are the differences -  as far as drive ability, reliability, if any. Looking at MH between 2000 - 2006   year's.
« Last Edit: June 03, 2017, 09:11:53 PM by Sun2Retire »

8Muddypaws

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Re: What's the difference between Cummins diesel and Cat diesel.
« Reply #1 on: June 03, 2017, 10:17:54 PM »
Cummins get slightly better fuel mileage.  That's not enough to steer me in either direction.  Both are pretty bulletproof if you take care of them.

Cat dropped out of the over road business several years ago.

I've been driving a Cat C7 for 6 years and haven't had a single problem.  For me the only difficult part of maintaining it is changing the secondary fuel filter.  Messy job that has to be done from under the bed of our motorhome.  I.e. Don't spill a single drop of diesel fuel!
Retired computer professional
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Utclmjmpr

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Re: What's the difference between Cummins diesel and Cat diesel.
« Reply #2 on: June 03, 2017, 10:31:29 PM »
  There is a reason all Cats are painted YELLOW,>>>Dan  (kitty,,kitty?)  ::) ::)
38' American Tradition 38TT/330 turbo Cummins
Jeep liberty 4 down
72 VW Baja 4 down
Cedar City, Utah
USAF vet. 59-63
The difference between intelligence & stupidity is: intelligence has it's limits
      Albert Einstein.
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Tom

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Re: What's the difference between Cummins diesel and Cat diesel.
« Reply #3 on: June 03, 2017, 11:22:18 PM »
Quote
There is a reason all Cats are painted YELLOW

The big CATs on our boat are painted white  ???
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Tom

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Re: What's the difference between Cummins diesel and Cat diesel.
« Reply #4 on: June 03, 2017, 11:24:10 PM »
Cummins has 'sleeved' cylinders which can result in erosion, see here. The big CATs on our boat have no such issue, but CAT's recall for issues leaves something to be desired.
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LarsMac

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Re: What's the difference between Cummins diesel and Cat diesel.
« Reply #5 on: June 04, 2017, 12:12:00 AM »
Cats sound a lot Puurrrrtier.  ;)

2000 Itasca Sundancer 430V
2007 Saturn Vue

If you lose your sense of humor, it's just not funny anymore. - Wavy Gravy

Utclmjmpr

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Re: What's the difference between Cummins diesel and Cat diesel.
« Reply #6 on: June 04, 2017, 06:01:16 AM »
 When starting a Cat,, it sounds like the rods need replacing.>>>Dan
38' American Tradition 38TT/330 turbo Cummins
Jeep liberty 4 down
72 VW Baja 4 down
Cedar City, Utah
USAF vet. 59-63
The difference between intelligence & stupidity is: intelligence has it's limits
      Albert Einstein.
President Western GM Coach chapter FMCA

NY_Dutch

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Re: What's the difference between Cummins diesel and Cat diesel.
« Reply #7 on: June 04, 2017, 07:03:10 AM »
Full width rear mud flap seen on a DP in Florida: "If it's not a CAT, it's a DOG". ;)
Dutch
2001 GBM Landau 34' Class A
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Chet18013

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Re: What's the difference between Cummins diesel and Cat diesel.
« Reply #8 on: June 04, 2017, 07:11:40 AM »
And no one has mentioned the one engine that you only see on the big high end coaches, the Detroit Diesel. We've had all three, Cat, Cummins, and Detroit. Much prefer the Detroit.
Chet18013
Full time in a 45' '04 Monaco Signature
towing a 2014 Jeep Grand Cherokee diesel

Gary RV_Wizard

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Re: What's the difference between Cummins diesel and Cat diesel.
« Reply #9 on: June 04, 2017, 07:28:49 AM »
There is no difference that would lead you to choose one motorhome over the other because of the engine brand. Forget engine brand and focus on more important matters, like suitability of floor plan, state of maintenance, tire age & condition, etc.
« Last Edit: June 04, 2017, 07:30:21 AM by Gary RVer Emeritus »
Gary
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TonyDtorch

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Re: What's the difference between Cummins diesel and Cat diesel.
« Reply #10 on: June 04, 2017, 09:00:48 AM »
you will find out the difference between Cat and Cummins when you need replacement parts.
« Last Edit: June 04, 2017, 09:06:32 AM by TonyDtorch »

lavarock1210

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Re: What's the difference between Cummins diesel and Cat diesel.
« Reply #11 on: June 04, 2017, 11:23:51 AM »
you will find out the difference between Cat and Cummins when you need replacement parts.

AND that is??

KandT

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Re: What's the difference between Cummins diesel and Cat diesel.
« Reply #12 on: June 04, 2017, 12:10:38 PM »
AND that is??

You will find out when you need the parts - he isn't just gonna tell you! ;D
2005 Winnebago Vectra
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Utclmjmpr

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Re: What's the difference between Cummins diesel and Cat diesel.
« Reply #13 on: June 04, 2017, 12:24:59 PM »
 Most Cat's in motorhomes have the rear mounted radiators that can be problematic if not cared for often.>>>D   ( Don.t take me too serious, I have many friends with Cats and I love to give them a bad time)      "meow"
« Last Edit: June 04, 2017, 12:29:18 PM by utahclaimjumper »
38' American Tradition 38TT/330 turbo Cummins
Jeep liberty 4 down
72 VW Baja 4 down
Cedar City, Utah
USAF vet. 59-63
The difference between intelligence & stupidity is: intelligence has it's limits
      Albert Einstein.
President Western GM Coach chapter FMCA

LarsMac

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Re: What's the difference between Cummins diesel and Cat diesel.
« Reply #14 on: June 04, 2017, 01:11:15 PM »
We have over 600k miles on the son's KW with Cat C4.4 motor. I love the sound of a Cat engine rolling down the highway.
 
2000 Itasca Sundancer 430V
2007 Saturn Vue

If you lose your sense of humor, it's just not funny anymore. - Wavy Gravy

Utclmjmpr

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Re: What's the difference between Cummins diesel and Cat diesel.
« Reply #15 on: June 04, 2017, 02:32:30 PM »
 People love the Detroit two stroke for the same reason.>>>D
38' American Tradition 38TT/330 turbo Cummins
Jeep liberty 4 down
72 VW Baja 4 down
Cedar City, Utah
USAF vet. 59-63
The difference between intelligence & stupidity is: intelligence has it's limits
      Albert Einstein.
President Western GM Coach chapter FMCA

TonyDtorch

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Re: What's the difference between Cummins diesel and Cat diesel.
« Reply #16 on: June 04, 2017, 03:25:20 PM »
AND that is??
the joke I use to hear around the truck repair shops is.... Cat paints everything yellow because it's the same price as Gold.
« Last Edit: June 04, 2017, 03:30:43 PM by TonyDtorch »

Robert K

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Re: What's the difference between Cummins diesel and Cat diesel.
« Reply #17 on: June 04, 2017, 03:49:08 PM »
My friend a mechanic at Kenworth when a Kenworth with Cat million mile club decal pulls in
Sez to his service manager you'll never see that on a Cummins
Bob 96 Safari 3126 Cat
Bob&Sandy
96 Safari Serengeti
2011 jeep wrangler
Western New York

TonyDtorch

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Re: What's the difference between Cummins diesel and Cat diesel.
« Reply #18 on: June 04, 2017, 03:59:13 PM »
My friend a mechanic at Kenworth when a Kenworth with Cat million mile club decal pulls in
Sez to his service manager you'll never see that on a Cummins
Bob 96 Safari 3126 Cat
some truckers may say you won't see a Kenworth with a million miles no mater what motor it has,  many viewed Kenworths as farm equipment .....the old joke was..."what's a Ken worth ?   ...not much".    .

then there was the    "old truckers never quit....they just get a new Peter built" ...and   " the Detroit diesel is a controlled oil leak "

 I'm just telling you what I used to hear around truckers..I've had all 3 in work trucks, Cat, Cummins and a Detroit.    they were all good motors.

IMO.  just about every diesel motor being used today is a perfectly adequate engine that will get your motorhome anywhere you want to go,
 I'll bet any of the diesel engines (properly maintained) will outlast most of the mid level motorhomes of today.
 
Don't forget about the trans.,  the word I hear,   the bigger the Allison, the better the Allison.

for me...it would be far more important to just get a great diesel motorhome that I loved for the layout and the options... 
(*with a power to weight ratio of not less than one to a hundred and a side radiator ).   
:)

« Last Edit: June 04, 2017, 06:56:43 PM by TonyDtorch »

AStravelers

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Re: What's the difference between Cummins diesel and Cat diesel.
« Reply #19 on: June 07, 2017, 08:59:54 PM »
-Looking into buying a DP motorhome for the purpose  going full time RV's. Been looking at 37ft. to 40ft. ,notice some have Cummins and others have Cat diesel. What are the differences -  as far as drive ability, reliability, if any. Looking at MH between 2000 - 2006   year's.
Putting this in perspective.  Which makes a better truck to tow a trailer, Ford, Chevy or Dodge?????  People are going to go with good or bad experiences or war stories from others and argue about which are better.

As Gary replied earlier, focus on the RV and not the engine. 

Also do the recommended maintenance.
Al & Sharon
2006 Winnebago Sightseer 29R
2009 Chevy Colorado 4X4

http://downtheroadaroundthebend.blogspot.com/

grashley

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Re: What's the difference between Cummins diesel and Cat diesel.
« Reply #20 on: June 07, 2017, 09:22:22 PM »
Putting this in perspective.  Which makes a better truck to tow a trailer, Ford, Chevy or Dodge?????  People are going to go with good or bad experiences or war stories from others and argue about which are better.

As Gary replied earlier, focus on the RV and not the engine. 

Also do the recommended maintenance.
Very well stated!
Preacher Gordon
09 Grand Junction 35 TMS - not yet received
2013 F350 Lariat LB SRW Supercab diesel 4X4
Nimrod Series 70 popup (sold)
It's not a dumb question if you do not know the answer.

timjet

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Re: What's the difference between Cummins diesel and Cat diesel.
« Reply #21 on: June 09, 2017, 06:02:51 AM »
Another suggestion is to do some research on the engine once you determine you like a particular coach. For example my coach came with a Cummins ISL and I learned that certain engine serial numbers were built with defective wrist pins. The coach I was considering and subsequently bought was not one with the affected pins.

Tim
Tampa Bay
'07 American Tradition DP 40', 1.5 bath
'14 Honda CRV

muskoka guy

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Re: What's the difference between Cummins diesel and Cat diesel.
« Reply #22 on: June 09, 2017, 07:20:32 AM »
you will find out the difference between Cat and Cummins when you need replacement parts.
My motorhome has a cummins, but I have two pieces of heavy equipment with cat motors. Great motors, no troubles but Cat does certainly highly value their parts. My other brands of equipment which are not Cat have much cheaper replacement parts.

mel s

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Re: What's the difference between Cummins diesel and Cat diesel.
« Reply #23 on: June 09, 2017, 12:21:53 PM »
you will find out the difference between Cat and Cummins when you need replacement parts.
TonyDtorch
How can the need of replacement parts tell you "the difference between Cat and Cummins" engines?

TonyDtorch

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Re: What's the difference between Cummins diesel and Cat diesel.
« Reply #24 on: June 09, 2017, 02:16:36 PM »
TonyDtorch
How can the need of replacement parts tell you "the difference between Cat and Cummins" engines?
see the post above yours ..

 

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