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03-18-2016, 02:30 AM
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#29
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Senior Member
Country Coach Owners Club
Join Date: Apr 2015
Location: Alberta
Posts: 1,591
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Should choosing the right Cummins on its HP/Torque Rating?
Quote:
Originally Posted by 38Chevy454
Just to clarify, you do have EGR being a 2006. You do not have the DPF or require DEF.
Back to OP, I second that bigger displacement is better, and if given two same hp ratings, go with higher torque (which would likely be the bigger size engine) I don't think I have ever heard someone complain they had too much power
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Nope. Not on my 400ISL. Engine build Dec 16, 2006. No EGR cooler nor crossover tube back to intake. No SCR either.
Here is a picture from Cummins Quickserve for my ESN. If you are still wary I could go take a picture of my engine to confirm.
__________________
Towr: 2007 Country Coach Allure 470 - 37 Sunset Bay Cummins 400 ISL, Coach #31563
Toad: 2016 F150 King Ranch - 3.5L EcoBoost 4x4 Supercrew (curb weight 4,775 lbs)
Toad: SOLD 2007 Jeep Grand Cherokee (yes, it has a Hemi) (curb weight 4,720 lbs)
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03-18-2016, 06:18 AM
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#30
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Senior Member
Fleetwood Owners Club Ford Super Duty Owner
Join Date: Oct 2013
Location: northern IL
Posts: 2,557
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I was looking at the sticker to that 2006 Intrigue Jubilee and it was 580k or 680k, cant remember. Im sure they will be at or above the 1 million level. I hope Winnebago does them justice. It would be a shame to bring them back out in any lesser form. Definitely a small market but I think its there. It will seem weird not to see yellow under the hood.
__________________
2014 Fleetwood Bounder 35k
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03-18-2016, 06:37 AM
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#31
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Senior Member
Join Date: Nov 2008
Location: Cosby, Tn
Posts: 6,587
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Quote:
Originally Posted by BrianGlenn
Nope. Not on my 400ISL. Engine build Dec 16, 2006. No EGR cooler nor crossover tube back to intake. No SCR either.
Here is a picture from Cummins Quickserve for my ESN. If you are still wary I could go take a picture of my engine to confirm. Attachment 121686
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Brian is correct. I'm guessing he got one of the last ISL to be built without an EGR system. The ISL didn't have it until the '07 EPA requirements. It seems that the EGR is the most problematic emissions devise on these diesels. It also has a negative effect on mileage. Should ensure a big market for the Ugly Fix.
__________________
Steve Ownby
Full time since 2007
2003 Monaco Signature
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03-18-2016, 07:14 AM
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#32
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Senior Member
Winnebago Owners Club
Join Date: Mar 2014
Posts: 14,890
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If you are wanting big displacement with large towing capacity have you considered a Super C for your MH?
__________________
Gordon and Janet
Tour 42QD/InTech Stacker
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03-18-2016, 07:25 AM
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#33
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Senior Member
Join Date: Nov 2013
Location: Elko, Nv
Posts: 2,449
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My experiance buying a DP. We bought a year old 40ft coach with a 6.7 Cummins and the floor plan we thought we liked. Made it 8 months and traded it in on a 38ft coach with the floor plan that we for sure like and a 8.9 Cummins. I will never own a MH with anything smaller than a ISL in it after driving this one.
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03-18-2016, 08:10 AM
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#34
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Senior Member
Winnebago Owners Club
Join Date: Jun 2013
Location: Full-timer/volunteer w/SOWERS
Posts: 3,958
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Quote:
Originally Posted by Steve Ownby
Never saw a Cummins ISC with a 400 ho rating. What coach was it in?
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My error. It was the ISL option in a '05 Winnebago Vectra 40FD. Didn't like that coach for many reasons. The ISL did pull any better than the ISC we now have.
__________________
Rick & Melissa Young, 2011 Itasca Meridian 40U, Frtliner XCL, Cummins ISL 380HP/DEF, Allison 3000 MH, 2014 Honda CR-V, SMI AF1, Blue Ox, EEZ TPMS, TruCenter steering control
Servants On Wheels Ever Ready. Best job we ever paid to do . (full time volunteers)
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03-18-2016, 08:30 AM
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#35
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Registered User
Join Date: Aug 2011
Location: Western New York
Posts: 899
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Well I don't have a diesel rig but if the OP is concerned about HP, Torque, and worry about gas mile, or should I say diesel fuel mileage, perhaps RV'ing isn't the thing for him. Especially true if he's looking for a rig to drive like a race car through mountain passes. From everyone I have talked to though about DP's, which would be my retirement rig of choice, the OP is on the right track looking for a used rig pre 2007 emissions rig.
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03-18-2016, 08:45 AM
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#36
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Senior Member
Join Date: Jul 2012
Location: Fulltime, USA
Posts: 16,706
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Should choosing the right Cummins on its HP/Torque Rating?
Quote:
Originally Posted by Mr_D
Our Magna has about the same power to weight ratio as our '02 Dutch Star with the Banks kit but I can tell you the Magna will leave the DSDP in the dust on acceleration and holding speed in the hills. That add'l 750 lbs ft of torque makes a huge difference.
The DSDP was turning 1650 @ 60 mph, the Magna is 1350 @ 60 and it's torque is 1950 lbs ft from 1100 to 1600 rpm so it's right in the middle of the curve. Makes it very responsive to throttle input too with not much need to shift down. Use the "economy" mode most of the time too.
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Well, your rig rolls at 50k lbs while mine is 43k, so I'm thinking your extra 41% HP does what is expected with only 16% more weight.
I may lag behind slightly on a hill, but the traffic in town is an equalizer.
But, I can't afford more than what I have, soooooo....
Dave and Nola, RV Mutants
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03-23-2016, 05:48 PM
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#37
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Senior Member
Newmar Owners Club Spartan Chassis
Join Date: Jun 2013
Location: Apple Valley CA
Posts: 1,069
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When I purchase my coach engine and year was a big factor. 2006 was the last year of no EGR, DPF or DEF and that is what I was looking for. It came with an ISL 370 HP@1200ft.lbs of torque that was derated to 350HP @ 1050lbs. I towed a 2002 Saturn SL2 for a while then purchased the Chevy Colorado to replace it. The difference of 2200lbs in weight. I went from 32,000 lbs GCVW to 34,500. The 350 was adequate but I wanted more. I had a Cummins shop reflash the ECM (engine control module) to bring it up the 400HP @ 1200ft./lbs of torque. It was like driving a whole different coach. I climb 6%+ grades now at 60 mph and never drop below 5 gear. It did drop my fuel mileage about .5 MPG but was well worth the $425 spent. The 8.9 ISL Common Rail engine is a great workhorse and is tuneable. It can be configured in 350, 370, 400 and 425 HP just by the way the ECM is programmed and it's box stock so to speak. The Maximum torque is 1200ft/lbs. There are millions of them on the road. In the 2005-06 year Cummins had a recall on certain ones produced. That has been talked about at length on this forum. This is the posted info on the recall:
This defect involves Cummins model ISL CM85O diesel engines produced for recreational vehicle applications between October 17,2005 and April 18, 2006. There are 2159 engines in the subject population that we intend to campaign.
All ISL CM850 engines in the subject population are covered by this recall. The ISL CM850 recreational vehicle ESNs eligible for this campaign range from 46543077 to 46603939.
Identification of the item: Connecting Rod
Engine Make: Cummins
Model: ISL CM850
Part Number: 3971 393
Function: Transmit energy from the piston to the crankshaft.
Good luck in your search
__________________
[SIGPIC][/SIGPIC]
Craig & Carolyn Roberts Apple Valley, CA
Toad: 2017 GMC Canyon 4X4 Crewcab
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03-23-2016, 08:45 PM
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#38
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 30,878
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Horsepower is calculated from torque. That makes torque foremost in choosing the best pulling engine. Power and Torque: Understanding the Relationship Between the Two, by EPI Inc.
__________________
2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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03-23-2016, 09:31 PM
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#39
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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Quote:
Originally Posted by Ray,IN
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FINALLY someone that understands that HP is calculated from torque and rpm, nothing more!!
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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03-23-2016, 09:52 PM
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#40
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Senior Member
Monaco Owners Club
Join Date: Oct 2012
Location: Glen Allen, Virginia
Posts: 187
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Old L-10 with 106,000 on the clock in a coach that weighs 34,000 pounds pulling a 28foot enclosed trailer. Run mostly in east coast flatlands but that sucker is hard to keep under 70 getting 9 MPG.
__________________
92 Crown Signature, 330 Cummins
Future iRV2 Moderator...vote for Dan Osborne
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03-24-2016, 09:26 AM
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#41
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Senior Member
Winnebago Owners Club
Join Date: Mar 2014
Posts: 14,890
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Our coach pulling 53,000 lbs seems to have enough power. Our calculated HP at the speed we run is about 330.
__________________
Gordon and Janet
Tour 42QD/InTech Stacker
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03-24-2016, 05:41 PM
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#42
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Senior Member
Holiday Rambler Owners Club
Join Date: May 2011
Location: Texas
Posts: 233
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I had a 36 ft '97 Holiday Rambler with a CAT 325. It was a great unit, but when I hooked up my Honda CRV, I almost never got to 6th gear...even in Texas where there aren't too many mountains.
So yes, when I upgraded engine size was a big deal. I bought a 2007 with a Cummins 400ISL. It has been a great choice. My coach is 40 ft and weighs in at 33K ibs. It is rated to tow 10K and pulls my Honda with no problems at all.
No Def or other special emission stuff.
My buddy has a Monaco tag 42ft and it weighs in at 43K and it has the same 400ISL. He doesn't have any problem pulling his toad either and he goes to Colorado about 4 times a year.
I'm convinced the 400 ISL is perfect for me and the 2007 means no Def.
__________________
'07 Holiday Rambler Endeavor PRQ ("Elvis"), and our 2012 CRV toad
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