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Old 03-19-2014, 06:05 PM   #15
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There you go Terry. My little ISB motor is enough for my lighter coach & it got 10.1 mpg down to Key West and back. The savings paid for a couple of great meals down there. If the RV lifestyle is about taking your time, why is everyone is such a hurry?
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Old 03-19-2014, 06:07 PM   #16
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Quote:
Originally Posted by D Lindy View Post
You can have all the HP you want/can get, but the bottom line for pulling up hill is Torque!
No, it is NOT. What gets you up a grade at speed is HORSEPOWER, not torque.

The difference between a diesel and a gas engine is the RPM at which maximum HORSEPOWER is made. The typical 350 HP diesel will develop its maximum horsepower at about 2,000 RPM. The current production Ford V-10 develops it's 362 HP at about 4,800 RPM.

Horsepower is a measure of both torque and RPM. An engine that makes 350 HP at 2,000 RPM develops more torque than a 350 HP engine that has to spin faster to make that same 350 HP. But HORSEPOWER IS HORSEPOWER, no matter what kind of engine is producing it.

Climbing the grade with the diesel at 2,000 RPM or the gas engine at 4,800 RPM is going to get you up the grade at the same speed, given similar coach weights.
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Old 03-19-2014, 06:11 PM   #17
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Originally Posted by Rich-n-Linda View Post
No, it is NOT. What gets you up a grade at speed is HORSEPOWER, not torque.

The difference between a diesel and a gas engine is the RPM at which maximum HORSEPOWER is made. The typical 350 HP diesel will develop its maximum horsepower at about 2,000 RPM. The current production Ford V-10 develops it's 362 HP at about 4,800 RPM.

Horsepower is a measure of both torque and RPM. An engine that makes 350 HP at 2,000 RPM develops more torque than a 350 HP engine that has to spin faster to make that same 350 HP. But HORSEPOWER IS HORSEPOWER, no matter what kind of engine is producing it.

Climbing the grade with the diesel at 2,000 RPM or the gas engine at 4,800 RPM is going to get you up the grade at the same speed, given similar coach weights.
Really
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Old 03-19-2014, 06:15 PM   #18
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Yes...really.
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Old 03-19-2014, 06:17 PM   #19
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torque is how much your gpnna move. horsepower is how fast your gonna do it.
i love these mechanical debates.
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Old 03-19-2014, 06:18 PM   #20
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Do not know about the technical stuff. My Cummins ISC with 330 HP gets me everywhere I want to go, with timely response and suitable "giddyup" (a technical energy transfer term. most often associated with folks from the central southern states area known as Texas). Have been over the Continental Divide many times, from New Mexico to the Yukon, hauling a towed, and always with acceptable performance. If I wanted to get there quicker, I wouldn't be driving this monster I lovingly call "home".
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Old 03-19-2014, 06:25 PM   #21
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torque is how much your gpnna move. horsepower is how fast your gonna do it. i love these mechanical debates.
Very well said. Horsepower determines how fast you'll go up a grade.
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Old 03-19-2014, 06:38 PM   #22
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Look at torque not hp. I have 1250 ft. Lbs. in a tag axle at 44 feet. I've pulled a toad on a dolly up a 7% 4 mile grade in 6th gear at 55 mph without any issues and got 9.3 mpg for the entire 3000 mile trip.
1250 ft. lbs. should be all you need.
George, this is not a smart remark but if I were you I would keep that coach for the rest of my life! Wow that's unbelievable.

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Old 03-19-2014, 06:38 PM   #23
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Our V10 gets us over all the Colorado passes just fine while towing our new Rubicon with a trailer hooked to the Jeep and our ATV on the trailer.
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Old 03-19-2014, 06:39 PM   #24
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Heading South from Darango in 5th (direct), I made it over the top, never getting the temp to the point of worry. No it didn't get to the top like my 80' KT600 Cummins Pete
but it was strong enough to keep pace with the speed limit @ 1400/1500 ft. lbs.. (M11).

This is a question of weight and how you like play in traffic.
I'm best at 1350/1400 rpm which is fast enough and get decent milage too. pc
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Old 03-19-2014, 08:47 PM   #25
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I have a C15 475/1650 in my truck conversion because they didn't offer a C16. Displacement and torque takes you up the hill. Ever try to tow a big trailer with a small block -don't work well on a hill.
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Old 03-19-2014, 09:02 PM   #26
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Well, I can go faster downhill, on less fuel and do it better and with less torque and horsepower. Torque, Horsepower, and higher gears.
Horsepower and Torque: A Practical Explanation Read this and quit arguing.
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Old 03-19-2014, 09:33 PM   #27
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For some folks it's about saving money, for some it's about being the biggest and the baddest, for some it's a compromise. Do what you want. I'm very happy with my 43' Dynasty with the cummins 425 ISL. For me it's a trade off on the purchase price. I would be looking at new Newells with at least 600hp but don't want to spend that much on a coach. Personally I would get all of the HP you are willing to pay for. IMHO you'll be happier in the long run. Nice play on words huh.
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Old 03-19-2014, 10:10 PM   #28
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George, this is not a smart remark but if I were you I would keep that coach for the rest of my life! Wow that's unbelievable.

Jim
The trip was Atlanta to Denver and back with only 3500 miles on the engine. This thing got about the same MPG as my F350 with the 5th wheel I sold. It's one of those Maxxforce 10 engines from Navistar. I think one of the key factors was that it's max. torque was achieved at 1100 RPM's. The manual warns you NOT to down shift and to keep it between 1000-1300 RPM's for max. torque. Heading to the Keys in a few weeks so with level ground and a little more mileage on the engine, it may improve. I do run Rotella synthetic and the engine temp. never exceeded 208 degrees. Usually ran around 195-200.
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