Good Sam Club Open Roads Forum: Is there any difference in DRIVING a gas class A vs diesel?
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 > Is there any difference in DRIVING a gas class A vs diesel?

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Gjac

Milford, CT

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Posted: 11/30/20 07:33am Link  |  Quote  |  Print  |  Notify Moderator

map40 wrote:

"I had at least 26 different RVs. Somehow I never found the diesel to be more powerful than the gas". This is very true. When people say a diesel is more powerful than a gas MH it is not an apples to apples comparison. For example 38-40 ft DP will weight 30K lbs or more and have maybe 300-380 HP. A gas MH on Ford chassis may weigh half the weight at 15-18K lbs and have 362HP. The gas MH will have the same 362 HP eng in any length while a DP will usually have a smaller eng in the shorter lengths. So a 32ft gas chassis will have a much higher HP to weight ratio than a 40 ft DP. Quality in general, soother ride and more living and cargo space would be better reasons to buy a DP.

Bruce Brown

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Posted: 11/30/20 07:00pm Link  |  Quote  |  Print  |  Notify Moderator

^^^ But a diesel has TORQUE a gasser doesn't. Where a gasser fades on a long, uphill pull, a diesel just keeps humming along.

But you are correct, some diesels have the "low torque" engines, the bigger ones don't.

Our 39'er is 400hp, but it's also 1200 #/ft torque. That the number that makes driving it more enjoyable.

My Super Duty is a diesel too, for a reason.


There are 24 hours in every day - it all depends on how you choose to use them.
Bruce & Jill Brown
2008 Kountry Star Pusher 3910


Gundog

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Posted: 11/30/20 08:58pm Link  |  Quote  |  Print  |  Notify Moderator

I did not read all the replies but if you tow having an exhaust brake sure is nice.


2005 34' Expedition Cat C7 Allison 3000

map40

Florida

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Posted: 12/02/20 05:09am Link  |  Quote  |  Print  |  Notify Moderator

I did not mean to ruffle too many feathers. The best example I can give you is I had a Fleetwood Fiesta LX, 37 feet long, V10, 362HP. Towing 5000#s I could go up hill accelerating with no problems anywhere. My 2007 Alfa See Ya Cat C7 350HP towing 5000# would not pick up any speed when going uphill.
If I put my foot down, the gasser would take off much faster, no matter what.
I understand the Alfa is heavier, but the gasser was no slouch. I believe there is an outdated concept that all diesels are better. I believe that once you go over 400HP and 1000# of torque diesels are faster, but the gassers have improved so much that they can compete with no problems.
Why do I have Diesels? Simple: rear engine, no noise, ride quality.
Also speed limit. The F53 is limited to 75. I don't drive that fast, but the transmissions in the F53s are doomed thanks to the governor. You put the foot down, it down shifts and once it hits 75 it stays there, revving at 5000RPM. This will kill the tranny pretty fast.
One last thing, I did not buy a new RV every year, I owned an RV rental company and we had a fleet. I have seen the RVs go through 200K on both types of engines trouble free. As a matter of fact, I had a V10 in a class C with 300K, all original.
To the OP, my advise is make your decision based on ride quality, handling, noise and layout, not fuel type. Diesels cost twice as much to maintain. Unless you are buying something with over 400HP, power is not much of a difference anymore


Alfa SeeYa, 2015 Jayco XL31, 2015 Itasca XL31, 2012 CA 25, 2008 CA 28. RV with most millage: 312K miles on a V10
Life rocks when your home rolls

map40

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Posted: 12/02/20 05:10am Link  |  Quote  |  Print  |  Notify Moderator

Gundog wrote:

I did not read all the replies but if you tow having an exhaust brake sure is nice.

Gas engines now have transmission braking also

wolfe10

Texas

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Posted: 12/02/20 08:02am Link  |  Quote  |  Print  |  Notify Moderator

map40 wrote:

Gas engines now have transmission braking also


Yes modern transmissions in gasoline chassis now have the ability to downshift to give raise engine RPM to produce braking HP.

But, don't confuse it with a transmission brake= transmission retarder which has massively more braking HP.


Brett Wolfe
Ex: 2003 Alpine 38'FDDS
Ex: 1997 Safari 35'
Ex: 1993 Foretravel U240

Diesel RV Club:http://www.dieselrvclub.org/

Racklefratz

Everywhere

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Posted: 12/12/20 11:21am Link  |  Quote  |  Print  |  Notify Moderator

map40 wrote:

To the OP, my advise is make your decision based on ride quality, handling, noise and layout, not fuel type. Diesels cost twice as much to maintain. Unless you are buying something with over 400HP, power is not much of a difference anymore

Power may be of lesser importance now, but powerBAND is still a big deal, one that newcomers to RVing may not always be aware of.

People complain about the noise up front in a gas-powered Class A, and for good reason. It's noisy not only because the engine is situated right between them, but also because a gasoline engine has to turn higher RPMs to make its rated power. This is a concern because an engine that constantly runs at higher RPMs will suffer greater parts wear over time.

A diesel, OTOH, makes good power at significantly lower RPMs, which results in longer engine life. Our 450HP Cummins-powered RV loafs at 1,750RPM at 65MPH. You won't see that in a gasser - it'll be screaming.

The combination of more usable power and torque at lower RPMs explains why over-the-road trucks and most construction equipment use diesel power. These same reasons are why diesel engines make for an attractive solution for Class A motorhomes.

The price of admission will typically be less for a gas powered motorhome, but like anything else in life, you get what you pay for.

* This post was edited 12/12/20 11:30am by Racklefratz *


2012 Tiffin Allegro Bus 43QGP

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