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Old 03-17-2016, 07:22 PM   #15
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In reference to emissions equipment, my 2007 Itasca Horizon has the 400hp 1200 ft pounds torque Cummins 8.9. It's on a 2006 Freightliner chassis and doesn't have the DEF or DPF. My mileage is in the 7 range whether I tow or not. The trip this year is to AK so some bigger mountains in my future.
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Old 03-17-2016, 07:29 PM   #16
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Old 03-17-2016, 07:44 PM   #17
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In reference to emissions equipment, my 2007 Itasca Horizon has the 400hp 1200 ft pounds torque Cummins 8.9. It's on a 2006 Freightliner chassis and doesn't have the DEF or DPF. My mileage is in the 7 range whether I tow or not. The trip this year is to AK so some bigger mountains in my future.
Bigger engines don't necessarily get worse mileage either. Our rig weighs 50,000#'s and we tow a Honda Odyssey that weighs another 4,500#'s. Overall mileage is 7.6 over 45,000 miles.
That's about the same mileage as our previous 33,000# 40' '02 DSDP 350/1050 ISC with Banks (435HP/1200 ft lbs.) gave us, towing the same Odyssey.
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Old 03-17-2016, 07:52 PM   #18
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400+ hp with the torque around 1200+ will do a great job and get decent mileage. You can doctor many of those setups with engine fans and tuner chips. There are dyno results to show the improvements. I get 8-9 mpg and have plenty of power towing,. I am close to 40K lbs combined.
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Old 03-17-2016, 08:20 PM   #19
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In 2005, Monaco started using the Cummins ISL in the Diplomat line. Many other brands also started using the ISL around that time. The Cummins ISL comes in several HP ratings from 380 - 450 HP. It's probably one of the best RV engines on the road and one of the most popular.

Unless you're looking at something in the 45' range, you'll find the ISL is a very good performer.
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Old 03-17-2016, 08:55 PM   #20
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Our motorhome is "short", but it goes a long way between fuel stations with the most fuel efficient diesel engine Cummins makes (ISB 350 6.7 L). We may not be the first one at the campground, but we get there. Of course being retired we enjoy the luxury of not having to be someplace fast in order to fit everything in one or two weeks of vacation time. As has been said before the motorhome is on the road about 10-20% of the time unless it is setting in storage or on a driveway etc. I drive in the right "slow" lane on cruise control and enjoy the panoramic view out of my "I-Max" windshield. On steep grades 6-10% I keep my RPM up and the rig does OK, no race car, but faster then most semi's. Yes sometimes I would like more Torque, but when I see how well my miles per gallon is doing I quickly forget that I'm not doing 65 mph over the hill. On the downside that is a different story. That is my story......oh did I mention that my wheelbase is short and I can park it in State Parks and Thousand Trails Forest campgrounds? Sanford
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Old 03-17-2016, 09:35 PM   #21
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You want to check the year but I believe 2006 might be the last year that they had the overheating problem with cummins. It was 2005 or 2006 if you do some research on the internet you can find it. Several coaches with side radiators have a problem with the sandwich design and too small surface area. My 2005 Allegro Bus was one of the years that had the problem. I only had it show up in High Mountain areas in the summer. there is not a good cheap fix. One person posted he had bought the coach new and raised enough cain that a freightliner garage got them to pick up the tad for purchasing a bigger radiator and moving it to the rear of the engine. Total bill about 12, 000.00 I have an idea when I start traveling again to places where I anticipate the problem I am going to manufacture a water injection system to mist waster over my radiator and see if that helps.
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Old 03-17-2016, 10:11 PM   #22
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I have the Cummins ISM rated and 450hp in a 40' coach and friends have 40' American Eagle with the the Cummins 350hp. I followed them down thru the Hill country to San Antonio. Both coaches similar in weight (35K) and both toads are about the same weight. With both of us running on cruise control I noticed that I had to lag a ways behind because I would overtake him on the hills. 350 hp will get you to where ever you want to go...anything more is just extra icing on the cake. It is nice to have a little extra icing though!


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Old 03-17-2016, 10:18 PM   #23
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I have the Cummins ISM rated and 450hp in a 40' coach and friends have 40' American Eagle with the the Cummins 350hp. I followed them down thru the Hill country to San Antonio. Both coaches similar in weight (35K) and both toads are about the same weight. With both of us running on cruise control I noticed that I had to lag a ways behind because I would overtake him on the hills. 350 hp will get you to where ever you want to go...anything more is just extra icing on the cake. It is nice to have a little extra icing though!
Yep, had the opposite experience with our '02 DSDP w/ISC 350/1050 with Banks kit for 435/1200. Followed a friend in his '07 Essex with ISM 500 and lost ground going up hills even though our weight/HP ratio was close.
With the present rig I can say: What hills?
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Old 03-17-2016, 10:51 PM   #24
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Yes, yes and yes. Based on your user name, you are familiar with light duty diesels (power stroke). I had a 7.3, 6.0, and 6.4. When looking for my DP I targeted mid range coaches with 400HP+ and pre 2007 EPA emissions.

I understand the positives of cleaner technology in EPA 2007 and 2010 requirements, however after seeing the impact of both stages of EPA emissions requirements on LDT diesels, and where my budget limited me - my decision led me to the 400ISL Cummins. Cummins went to a 425HP with the 2007 EPA, and I believe the extra 25HP was lost in EGR and DPF (IMHO).

I ended up with a 2007 37 foot tag axle, with 2006 Cummins 400ISL (Engine build date Dec 2006), no EGR, SCR, or DPF, or DEF (2010).

It works for me...

I tow a 2007 Jeep, 4,600 lbs. I do slow down up long grades, but I downshift and drive it in the power band.

Engine was important to me; second only to manufacturer (Country Coach, Travel Supreme, higher model Monaco).

Brian


Here's a man who knows his stuff! I agree, Country Coach #1. Probably the finest coach built and was available back in those days with a 500 hp and I believe even 600 hp. The Travel Supreme comes in a close second and was available with a 600 hp power plant. Nothing and I mean nothing comes close to country coach for build quality. Just sold an 06 Intrigue the other day and it was like new. Its been so many years I forgot how solid the floors and wall were. Was more like standing in your home on a cement slab than being in a motorhome. Even the quality of the caps and bodywork not to mention the wood work. What a shame they are not around anymore. Also keep in mind if your financing it, 06 is the cutoff right now for most banks and will soon be 07.
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Old 03-17-2016, 10:54 PM   #25
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Here's a man who knows his stuff! I agree, Country Coach #1. Probably the finest coach built and was available back in those days with a 500 hp and I believe even 600 hp. The Travel Supreme comes in a close second and was available with a 600 hp power plant. Nothing and I mean nothing comes close to country coach for build quality. Just sold an 06 Intrigue the other day and it was like new. Its been so many years I forgot how solid the floors and wall were. Was more like standing in your home on a cement slab than being in a motorhome. Even the quality of the caps and bodywork not to mention the wood work. What a shame they are not around anymore. Also keep in mind if your financing it, 06 is the cutoff right now for most banks and will soon be 07.
Those of us with CC's hope that Winnebago does keep up the tradition/quality! But the prices will be much higher too. Ron Lee spent a reported $1.2 million+ building his 2016 Allure 480. In 2009 our Magna 630 carried a sticker of million and that could go well over 1 million today. Just might not be something that people would be willing/able to pay.
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Old 03-17-2016, 11:07 PM   #26
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Yes, yes and yes. Based on your user name, you are familiar with light duty diesels (power stroke). I had a 7.3, 6.0, and 6.4. When looking for my DP I targeted mid range coaches with 400HP+ and pre 2007 EPA emissions.

I understand the positives of cleaner technology in EPA 2007 and 2010 requirements, however after seeing the impact of both stages of EPA emissions requirements on LDT diesels, and where my budget limited me - my decision led me to the 400ISL Cummins. Cummins went to a 425HP with the 2007 EPA, and I believe the extra 25HP was lost in EGR and DPF (IMHO).

I ended up with a 2007 37 foot tag axle, with 2006 Cummins 400ISL (Engine build date Dec 2006), no EGR, SCR, or DPF, or DEF (2010).

It works for me...

I tow a 2007 Jeep, 4,600 lbs. I do slow down up long grades, but I downshift and drive it in the power band.

Engine was important to me; second only to manufacturer (Country Coach, Travel Supreme, higher model Monaco).

Brian
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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Old 03-17-2016, 11:14 PM   #27
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It's all about the power to weight ratio.
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Old 03-17-2016, 11:29 PM   #28
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It's all about the power to weight ratio.
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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