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Open Roads Forum  >  Class A Motorhomes

 > how much hp needed

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Ivylog

Blairsville, GA and WPB, FL.

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Posted: 08/12/11 02:48pm Link  |  Print  |  Notify Moderator

I actually have a 6-71 in a 35 year old rollback truck and even at 50,000.bs it's a slug. Still have 318 GM in a 10 wheel dump and it's OK at 55,000lbs. but who wants to go back to what was the norm 30 years ago. I think the 5.9 is a great engine even having just bought a Allegro Bay MH with it and a Allison to clean up and sell. But 300 HP in a 5.9 will not do what 300 HP in a 8.3 will do and my point was be careful if just looking at the HP.


This post is my opinion (free advice). It is not intended to influence anyone's judgment nor do I advocate anyone do what I propose.

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PAIRAJAYS

Washingston State

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Posted: 08/12/11 05:02pm Link  |  Print  |  Notify Moderator

No one said, what i've got sucks, my next one will have more HP. Wonder why that is?

Jim E

wolfe10

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Posted: 08/18/11 10:17am Link  |  Print  |  Notify Moderator

jtweider wrote:

Jus Cruisin wrote:

Look at torque #'s - as far as I am concerned that is the most important #.


X2


What high torque at low RPM gives you is that you is NOT more power (a HP is a HP, whether generated at very low torque and extreme high RPM by a gas turbine engine or high torque at low RPM by a diesel). Gasoline engine fall in the middle ("medium" torque, "medium RPM).

The diesel's high torque at low RPM means that you can climb a grade at a much lower/easy to sustain RPM. Even on long steep grades, you will hear the loaded 18 wheelers pulling 80,000 pounds walking up the grade at low RPM.


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jtweider

Port Angeles, WA

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Posted: 08/18/11 07:53am Link  |  Print  |  Notify Moderator

Jus Cruisin wrote:

Look at torque #'s - as far as I am concerned that is the most important #.


X2

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Posted: 08/16/11 09:47pm Link  |  Print  |  Notify Moderator

katoomer wrote:

Is there a significant increase in fuel consumption when you jump from 350 hp to 400 hp or more? Would a 45ft tag with 500 hp get far worse fuel mileage than a 40ft with 350 hp?



The 500 will get better mileage...at least that's been my hands on experience...! less work, means less RPMs, means better fuel mileage.......Dennis


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BWhite

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Posted: 08/15/11 08:45am Link  |  Print  |  Notify Moderator

One can never have enough HP . Imagine how efficent a 40' MH would be with a
C-15 or an ISX .


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