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Old 12-11-2012, 04:01 PM   #1
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Buying My First Diesel Pusher

Just wondering what everybody thinks of a 2002 300hp Cummings ISB engine. Haven't bought it yet, looking for input.

Coach is a 34' 3 slides, I don't have the gross weight of the coach.


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Old 12-11-2012, 07:25 PM   #2
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Well, I'll tell you what I've learned the past 6 months. There's been a lot of conversation about the Cummins 300 hp ISB. There are those who'll tell you it's too small, and you'll have problems in the mountains. We bought ours last March and didn't really know much at the time. After reading many threads about this, we got a little hung up on it for awhile. We then realized that FOR WHAT WE SPENT, the ISB is fine for us. It has handled perfectly fine for what we've needed. We aren't going to be going over the Rockies anytime soon, and when we do, it won't be often. It appears to me like it's a trade-off between what is important to you, what you need, and how much money you're willing to spend.

Gene, Gayle, & Oliver
2006 Holiday Rambler Endeavor 40 PDQ/2012 Honda CRV
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Old 12-11-2012, 07:29 PM   #3
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Mike, we went from a 28' Barth with 454 Chevy to a 38' pusher with 330 Cummins. The initial acceleration, that is starting from a dead stop, was noticeably slower with the diesel but as soon as the turbo spools up there was no comparison. You will love the torque. Costs more per gallon for fuel but you will probably get better MPG. Oil and filter changes are a LOT more expensive though. I prefer the diesel pusher myself. I think the 300 will handle the 34' with ease.
(1984 Barth Regal)
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Old 12-11-2012, 08:39 PM   #4
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I was concerned about the performance of the ISB-02 300HP, 600ft pound torque in our coach after we bought it. It has proven to be quite adequate for our needs towing a 4,000 pound car. There were three grades I was concerned about when traveling and towing in 90+ weather in the summer; Cabbage Hill just east of Pendleton, OR, The long grade eastbound on I-84 into Evanston, WY and the grade just east of Laramie, WY on I-84. This powerplant will not fly up those hills at the speed limit but @45mph and passing some of the slower traffic is sufficient for me on Cabbage Hill. Speeds are faster on the other two. Westbound on I-90 at Lookout Pass, MT into ID had me down to 35mph, that is the toughest one we've encountered so far. I like to keep my hill climbing RPMs around 2,500 to 2,700 using whatever gear is needed - this is usually 3rd gear on the MH2500. I hope this experience helps you in your decision making.
'07 Winnebago Journey 34H, ISB-02, MH2500
Toad - '08 Ford Taurus X
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Old 12-11-2012, 09:49 PM   #5
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We just finished driving 1300 miles with our 34 foot Meridian with the 300 Cummins. It was our first long drive and the cummins had plenty of power even through the mountains in Tennessee. We didn't have a toad but I'm sure if you keep the toad on the lighter side you will be happy with the performance. Do not be scared off by he small diesel, in anything below 36 feet it will do fine.
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Old 12-11-2012, 10:11 PM   #6
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Originally Posted by Booner View Post
Do not be scared off by he small diesel, in anything below 36 feet it will do fine.
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft
Charter Good Sam Lifetime Member, FMCA, SKP
RV'ing since 1957, NRA Benefactor Life, towing '05 Odyssey
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Old 12-12-2012, 06:16 AM   #7
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I have a 34 foot Monaco Knight with the 300 cummins.
Fantastic fuel economy and good enough performance.
We cross the continental divide 3 times from Alberta down I-15 to Las Vegas every year.
She handles the Rocky Mountains just fine.
I pull a Jeep Wrangler and make the mountain passes at 45 MPH
Without the Jeep on back I make the passes at 50 MPH
Flat freeways, I lock the cruise on 62 MPH and watch my fuel gauge move ever so slow.
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Old 12-12-2012, 05:24 PM   #8
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I would just like to say thank you to everyone that replied.

Thank you again,
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Old 12-12-2012, 05:27 PM   #9
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Not a ton of HP/torque, but you will get where you're going. Maybe slow down going up hills, but it will return upwards of 10mpg. on average. Not bad tradeoff, especially for your size coach. It should perform pretty well for you.
'07 Winnebago Journey 34H - CAT C7, Koni's, MCU's, SS Bell Crank, Safe-T-Plus
'07 HHR Toad, SMI AFO, Blue OX
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Old 12-13-2012, 08:34 AM   #10
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My experience is that Cummins makes a good product. One that will hold together for more miles than you will need. Not making a size comparison for the needs of that coach.
Larry B, Luckiest Dreamer
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Old 12-13-2012, 09:30 AM   #11
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The best formula is 10 hp per foot - length.

2007 Triple E - Empress Elite - Freightliner
WH 22 owner for 7 years
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