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Old 06-02-2007, 06:30 PM   #1
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Were thinking about a new Diesel Motorhome. With all of you out there experience what is the pros & cons between the Cummins 300hp and 5 speed and the 350 Cat with 6 speed. Mileage, power etc. Tow car is a 2006 PT crusier or a 2006 Jeep Wrangler which both way around 3200#. Is it really worth the extra $$,$$$ for the Cat? Thanks.
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Old 06-02-2007, 06:30 PM   #2
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Were thinking about a new Diesel Motorhome. With all of you out there experience what is the pros & cons between the Cummins 300hp and 5 speed and the 350 Cat with 6 speed. Mileage, power etc. Tow car is a 2006 PT crusier or a 2006 Jeep Wrangler which both way around 3200#. Is it really worth the extra $$,$$$ for the Cat? Thanks.
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Old 06-02-2007, 06:41 PM   #3
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Some folks have strong feelings for one or the other, but there are a lot of both makes out there and they're both good.

However, I'm partial to Cummins.

I guess it would depend how much extra the Cat with the 50 extra horsepower costs.
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Old 06-02-2007, 07:45 PM   #4
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Dirk, cost is around $12,000 difference. Guess I'll have something to think about. Thanks and good luck...
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Old 06-02-2007, 08:02 PM   #5
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The Cummins will deliver 2-3 mpg over the CAT C-7, but the driveability of the C-7 is far superior to the Cummins due to the increase in HP and Torque.

Owned both. Like the CAT best.
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Old 06-03-2007, 02:25 AM   #6
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You are really comparing more than just a difference in engine sizes. The Cummins will be the ISB 5.9 liter small block engine and a small Allison transmission. THe Cat is a larger block and Allison's 6 speed MH3000 transmission. THis combination is far superior to the smaller Cummins. Now if you were to compare the Cummins ISC 350 with equal transmissions this wouldbe a very close comparisson although there are some torgue range differences.
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Old 06-03-2007, 07:44 AM   #7
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One question is whether the engine option is on the same motor home? If it is the same MH then one of the engines is definitely the wrong HP. Manufacturers usually do a good job of sizing power to weight, etc. There seems to be a sweet spot for power and if you go below it you find inadequate power in decreased MPG. If you go above it you of course have more power and again less MPG. From posted experiences the MPG decrease for increased power (above optimum) is not as great as for decreased power. Granted, these are generalities and won't be a big help to you in deciding. To get specific you could post the MH, GVWR, and HP and see what MPG owners are getting. You can judge the power yourself if you have access the MHs. Climbing hills in a test is a good idea.
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