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05-21-2020, 08:49 AM
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#1
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Senior Member
Winnebago Owners Club Freightliner Owners Club
Join Date: Jul 2014
Location: Ohio
Posts: 185
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What's too big for gas.
Can some of you tell me your opinions on what point is the RV too big for a gas engine? Thanks.
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05-21-2020, 08:54 AM
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#2
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Senior Member
Join Date: Feb 2013
Location: Sedona, AZ
Posts: 3,012
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Works fine on my 38 foot, 22,000 pound MH, and that is with the five speed transmission. Should be even better with the six speed.
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Shell Bleiweiss
2014 1/2 Thor Challenger 37KT
Sedona, AZ
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05-21-2020, 08:56 AM
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#3
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Senior Member
Country Coach Owners Club
Join Date: Jul 2019
Posts: 444
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There is a reason most people hauling large fifth wheels go with diesels. Coming solely from a trailering perspective, I'd say when your (combined) weight goes above 26K it's a lot more enjoyable to drive a diesel. A gas engine will work well beyond that, but will be working harder, louder, and will have significantly less braking assistance than a diesel with a good exhaust brake. I'm sure the same applies to a class A.
__________________
2000 Country Coach Magna 40', 2022 Ram Power Wagon
4380W Solar 38kWh LiFePO4 18k/12k/12k/9k LG Mini Splits
Cinderella Travel & Lots of Other Modifications
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05-21-2020, 09:32 AM
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#4
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"Formerly Diplomat Don"
Newmar Owners Club
Join Date: Apr 2005
Location: Moorpark, Ca.
Posts: 24,076
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Those with long gassers will say they work fine and those with short gassers will tell you theirs are more powerful.
The reality, the statement above about diesels is the most accurate answer. Remember, before diesels were put in large over the road trucks, they ran gasoline engines, until the diesels took over the market.
It will be really hard to determine a specific point where you should no longer be running gas. There are many factors.....overhang on a long gasser, extra weight of a long gasser, lower gearing, which means lower mpg's, etc.
JMHO.....I would stay at 32' to 34' in a gasser, especially if you want to tow something like a toad or boat.
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Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
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05-21-2020, 09:43 AM
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#5
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Senior Member
Join Date: Jun 2016
Location: De
Posts: 494
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40ft 262in wheelbase 6speed trans v10 24,000GVWR loaded for fulltime tow Rogue Sport on dolly. No problems.
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05-21-2020, 09:44 AM
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#6
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Senior Member
Join Date: Jul 2012
Posts: 2,565
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With the new 7.3 Ford gas V8 and ten speed trans, it should do real good. Has a fairly flat, high torque curve. With the ten speed keeping it in that curve, it should be a beast. That's what an oil burner has going for it, torque! I like the V10, but I think this new V8 will be better!
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05-21-2020, 09:59 AM
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#7
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Senior Member
Holiday Rambler Owners Club
Join Date: Aug 2010
Posts: 9,746
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Seen one in a park that had 4 storage bays, behind the rear axle. Had to have been at least 12' of overhang!
I wouldn't want to be behind the wheel of that thing in the wind!
__________________
Ben & Sharon
2008 43' Holiday Rambler Scepter PDQ
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05-21-2020, 12:28 PM
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#8
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Senior Member
Join Date: Jul 2019
Location: Upstate SC
Posts: 2,969
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I'd say really the question is what is too heavy for a gas engine. Simply because for some reason they don't put turbos on bigger gas engines. Yet. But there's just way too many variables for me.
Best bet may be to shop for your best guess and then ask here if anyone is using one of those how you want to use it and their opinion of how it performs. There's like at least one of everything on this board and a number of people who have owned different coaches.
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05-21-2020, 12:38 PM
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#9
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Senior Member
Join Date: Jul 2014
Posts: 35,417
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Quote:
Originally Posted by A32Deuce
With the new 7.3 Ford gas V8 and ten speed trans, it should do real good. Has a fairly flat, high torque curve. With the ten speed keeping it in that curve, it should be a beast. That's what an oil burner has going for it, torque! I like the V10, but I think this new V8 will be better!
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10 speed in a pickup, maybe but there is no talk of a 10 speed in MHs. They are starting with the 6 speed.
Ever wonder why diesels still run 6 speed automatics ? With torque, you don't need gears.
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05-21-2020, 02:16 PM
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#10
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Senior Member
Join Date: Jul 2012
Posts: 2,565
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10 speed keeps the engine in the sweet spot of the torque curve!
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05-21-2020, 02:43 PM
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#11
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Senior Member
Join Date: May 2018
Posts: 890
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26k is largest f53 option.
Since ford F53 is really the only gas motorhome being made you are restricted to 26k pounds for the motorhome and 30k lbs for the total of your motorhome plus towed.
As s far as length goes it depends. Heavier materials tend to be nicer , more slide outs add weight. Some manufacturers top out at 36 ft while others go a bit longer.
As far as handling lots of variables like how long is the wheel base , what kind of anti sway and suspension options.
Gas motorhomes are less expensive initially and cheaper to maintain than deasel. A deisel will ride better and you can go bigger and or heavier.
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05-21-2020, 02:52 PM
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#12
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Registered User
Ford Super Duty Owner
Join Date: Nov 2014
Location: NW Ohio
Posts: 7,114
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My 270hp F53 V10 with 4 speed works just fine on my 35 ft Southwind, 22k lbs gross when loaded.
I can't run up I-70 to the Eisenhower tunnel at the posted speed limit, but I get up there.
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05-21-2020, 03:03 PM
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#13
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Senior Member
Join Date: Nov 2005
Posts: 7,400
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think dssl nailed it--IMHO.....the design of a gasser puts the engine and tranny upfront on a lower capacity axle....so with longer /heavier gassers, you end up with more rear overhang to spread the weight to the rear....gassers and DPs are becoming comparable but with the weight limits and rear distribution, the gasser builder has to limit the number of slides, solid wood vs composites cabinetry , carpet/vinyl vs floor/shower tile, glass doors vs plastic, etc. and finally--rear engine vs front dog-house noise levels.... Not making any judgements on what is better--just saying there is a difference in trim and accessories and price points.....
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Old Scout
2015 IH45 Foretravel
2003 Alpine 40' MDTS [Sold]
New Braunfels, Texas
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05-21-2020, 03:05 PM
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#14
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Senior Member
Fleetwood Owners Club Ford Super Duty Owner
Join Date: Jun 2012
Location: SoCal
Posts: 15,749
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Our previous class A motorhome was 38' on a Ford F53/v10 chassis. Pulled our 5000' jeep all over the western USA for several years. Got the job done.
__________________
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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