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Old 01-17-2016, 10:17 PM   #1
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Engine Size - Cummins ISB-XT

thinking of thor tuscany xte 36mq,this unit has isb-xt 360 hp with 800lb tq loaded 32,400lb is the power plant okay .this is a 2016 do a lot in the mountains thnxs TOM

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Old 01-17-2016, 10:23 PM   #2
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Well you won't be first to the top of the hill. But you will make it just fine.
Our first Dutch Star was a 38' with CAT 3126 300/860.
For me it just wasn't enough power.
Now I finally have enough!

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 '14 CR-V
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Old 01-17-2016, 10:26 PM   #3
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Search and you will find several threads questioning the ISB engines power capability.

I think you will find the consensus that while not a rocket ship it will get the job done. In addition to the power available one should also check the towing specs vs what you need as it can be less/limiting when using the ISB engine.
Vince and Susan
2011 Tiffin Phaeton 40QTH (Cummins ISC/Freightliner)
Flat towing a modified 2005 Jeep (Rubicon Wrangler)
Previously a 2002 Fleetwood Pace Arrow 37A and a 1995 Safari Trek 2830.
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Old 01-17-2016, 11:59 PM   #4
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The ISB is the 6.7L Cummins. Plenty good for many, many similar RV's from many, many brands.
But you can get a bigger engine
ISB - Cummins Engines

Best luck
Kim and Steve, Mustang LCDR (USCG Ret), Outlaw #1193
"I have seen gross intolerance shown in support of tolerance", S.Coleridge 1797
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Old 01-18-2016, 03:24 AM   #5
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Old 01-18-2016, 07:44 AM   #6
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Originally Posted by tombottcat View Post
thinking of thor tuscany xte 36mq,this unit has isb-xt 360 hp with 800lb tq loaded 32,400lb is the power plant okay .this is a 2016 do a lot in the mountains thnxs TOM
That is a good engine but it is the same engine they put in the dodge 3/4 ton truck so you will not be a rocket ship. If it was in the budget I would opt for a bigger displacement engine in the diesel world, something 8 liters or bigger. The bigger engines will have the bigger trans and rev less (2-2200K) as were the ISB will rev almost twice as much, but in the end, drive it if you like it get it.
2008 National SurfSide 34E (Bunk Model) Ford V10
Sold- 1990 Hawkins Chevy P30 454
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Old 01-18-2016, 10:48 AM   #7
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Rule of Thumb for Coach HP

You do have lots of mountains. Awesome country you are in!

For what its worth here is my rule of thumb for diesel MotorHome horsepower:

You need 10 hp for each 1000 lbs of weight you want to move, including your tow.

So if it were me I would see the max weight capability for my engine would be 36k lbs with the 360 hp motor. I would be in the ball park with a tow that weighed under 2k lbs.

My coach, as an example, weighs 39k lbs. My Jeep tow is at 4k lbs. My Cat C-12 is at 505 hp. You can see the margin it has.

If you were any heavier with coach and tow you might unlike the coach early on.

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Old 01-18-2016, 11:03 AM   #8
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I agree it will get you there, but not as easily compared to large engine. It will rev higher and be working harder, using a bigger percentage of the total power capability. ISB is the 6.7 liter size now, older are the 5.9 liter. The smaller engine can rev higher than larger engine and has higher rpm power band as well.

Since you have more mountains to drive, a bigger engine would be better. Bigger should have more exhaust or engine braking capacity, which is very nice for the downhill side of that mountain pass. ISB does not have engine brake, but some have exhaust brake. Should read up if you don't understand the difference. Essentially exhaust brake is like a butterfly valve the restricts exhaust flow out of the engine. Real engine brake is built into the engine and uses compression to provide the resistance. An engine brake is better than exhaust brake if you have the option.

2005 Kenworth Showhauler truck conversion.
. 44 ft, Cummins ISX15 450 hp, 10 speed, twin screw
I used to have a handle on life, but it broke
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