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Old 03-18-2016, 03:30 AM   #29
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Should choosing the right Cummins on its HP/Torque Rating?

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Originally Posted by 38Chevy454 View Post
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

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. Click image for larger version

Name:	ImageUploadedByiRV2 - RV Forum1458289848.914701.jpg
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Size:	150.5 KB
ID:	121686
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Old 03-18-2016, 07:18 AM   #30
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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.
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Old 03-18-2016, 07:37 AM   #31
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Quote:
Originally Posted by BrianGlenn View Post
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

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.
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Old 03-18-2016, 08:14 AM   #32
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If you are wanting big displacement with large towing capacity have you considered a Super C for your MH?
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Old 03-18-2016, 08:25 AM   #33
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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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Old 03-18-2016, 09:10 AM   #34
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Never saw a Cummins ISC with a 400 ho rating. What coach was it in?
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.
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Old 03-18-2016, 09:30 AM   #35
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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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Old 03-18-2016, 09:45 AM   #36
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Should choosing the right Cummins on its HP/Torque Rating?

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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.

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....

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Old 03-23-2016, 06:48 PM   #37
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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
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Old 03-23-2016, 09:45 PM   #38
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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.
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Old 03-23-2016, 10:31 PM   #39
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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.
FINALLY someone that understands that HP is calculated from torque and rpm, nothing more!!
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Old 03-23-2016, 10:52 PM   #40
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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.
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Old 03-24-2016, 10:26 AM   #41
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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.
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Old 03-24-2016, 06:41 PM   #42
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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.
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