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40' diesel highest HP

ARTSBEST
Explorer
Explorer
Any input as to who makes the highest HP diesel engine in a 40' sized motor home?

I was looking at a 2014 Dynamax Grand Sport GT with 525 hp but it was sold and they have discontinued this model.

Thanks for any comments.
16 REPLIES 16

bshpilot
Explorer
Explorer
prstlk wrote:
Don't confuse horse power with torque. big things need torque more than hp. Not complicated it's math not opinions
research works
just sayin


agree & we (truck conversions) START at 1650 tq....and our 2nd axles are DRIVEN (not simple tags) axles...very tough to put us close much less OVER our GCWR
Don R.
'04 42' Haulmark Motor Coach - 450hp/1650tq / 12 spd SmartShift
'12 Jeep Wrangler Sport (manual trans)
'17 Platinum F350 (6.7L, SRW, CC, Long bed, 4x4)

prstlk
Explorer
Explorer
Don't confuse horse power with torque. big things need torque more than hp. Not complicated it's math not opinions
research works
just sayin
2007 Keystone Challenger 5th wheel, Ford F350 Super Duty 6.7L Diesel, Short Bed, 2 dogs and the cat and rolling down the road full time since May 2014

bshpilot
Explorer
Explorer
Haulmark, Renegade, Show Hauler, etc (basically all the class 8 chassis tractor types, like mine) have 450hp as the base engine & go to 650hp or more if you like. This is true regardless of the Chassis manufacture, i.e.: Freightliner, Volvo, International, P-Built etc.

only in the last couple of years have they started moving away from the 12 or 13 speed Smart/Auto Shifts and started installing the 6 speed Allison (torque converter) autos - I prefer the 12 or 13 speed smart shifts (no clutch pedal / dry clutch) over any torque converter automatic.
Don R.
'04 42' Haulmark Motor Coach - 450hp/1650tq / 12 spd SmartShift
'12 Jeep Wrangler Sport (manual trans)
'17 Platinum F350 (6.7L, SRW, CC, Long bed, 4x4)

mike_brez
Explorer
Explorer
Mr.Mark wrote:
mike brez wrote:
I don't know what size motorhome they put them it but I would stay clear of the Cummins 650 isx


Mike, just curious why you say to stay clear of the 650 ISX.

Talking to a Cummins tech once when we had our previous coach in for service, he told me the 600 HP Cummins was very difficult to work on in the Signature Series Monaco due to the very tight fit.

Mark


Mark I'm not sure if it's in this thread I didn't read through it but I guess their is a known problem with the head. Look for other posts by this user on irv2
Magna with a 650 isx
1998 36 foot Country Coach Magna #5499 Single slide
Gillig chassis with a series 40
02 Ford F250 7.3 with a few mods
2015 Wrangler JKU

Mr_Mark1
Explorer
Explorer
mike brez wrote:
I don't know what size motorhome they put them it but I would stay clear of the Cummins 650 isx


Mike, just curious why you say to stay clear of the 650 ISX.

Talking to a Cummins tech once when we had our previous coach in for service, he told me the 600 HP Cummins was very difficult to work on in the Signature Series Monaco due to the very tight fit.

Mark
Mr.Mark
2021.5 Pleasure Way Plateau FL Class-B on the Sprinter Chassis
2018 Mini Cooper Hardtop Coupe, 2 dr., 6-speed manual
(SOLD) 2015 Prevost Liberty Coach, 45 ft, 500 hp Volvo
(SOLD) 2008 Monaco Dynasty, 42 ft, 425 hp Cummins

Two_Jayhawks
Explorer
Explorer
I'm guessing our coach is/was a record holder for highest power to weight. I don't know if anything made today that comes close.
Bill & Kelli
2015 DSDP 4366 pulling a 21 JL Unlimited Sport
2002 Safari Zanzibar 3906 gone
1995 Fleetwood Bounder 36JD gone

mike_brez
Explorer
Explorer
I don't know what size motorhome they put them it but I would stay clear of the Cummins 650 isx
1998 36 foot Country Coach Magna #5499 Single slide
Gillig chassis with a series 40
02 Ford F250 7.3 with a few mods
2015 Wrangler JKU

tropical36
Explorer
Explorer
bluwtr49 wrote:
Older Beaver Marquis had 505 hp Cat C-12 later Patriot thunder and Marquis models go to 600 hp but not sure if any are 40'....might be larger.

Older Bluebird Wanderlodge's had the 505HP Cat, as well.
"We are often so caught up in our destination that we forget to appreciate the journey."

07 Revolution LE 40E_Spartan MM_06 400HP C9 CAT_Allison 3000.

Dinghy_2010 Jeep Wrangler JKU ISLANDER.

1998 36ft. National Tropi-Cal Chevy Model 6350 (Sold)

naturist
Nomad
Nomad
Ooooh, I LIKE that. Want.

2bzy2c wrote:

John_S_
Explorer II
Explorer II
Foretravel put ISX 650 in 40 footers and will put the ISX but at 600 now in any coach you want to build as long as it has a tag axle.
John
2015 Born Free Royal Splendor on a Ford 550
2018 Rubicon
Boo Boo a Mi Kie
42' 36' & 34 Foretravels sold
2007 Born free 24 sold
2001 Wrangler sold
2012 Jeep Grand Cherokee Overland sold
Susie Dolly, Lolly &Doodle (CKC) now in our hearts and thoughts

wolfe10
Explorer
Explorer
Might want to take WEIGHT into consideration when asking the HP question.

One of the best HP/weight ratios is the no slide Foretravel U320 with Cummins M engine. 450/500 HP in reasonably light weight coach. Came in 36 and 40'
Brett Wolfe
Ex: 2003 Alpine 38'FDDS
Ex: 1997 Safari 35'
Ex: 1993 Foretravel U240

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

gsander1
Explorer
Explorer
Here's a 40 foot Magna with 600HP as an example.
http://www.premierrvservices.com/2007-magna-40/
George in Birmingham, AL
03 Country Coach Magna

2bzy2c
Explorer II
Explorer II
My advice is worth exactly what you paid for it.

bluwtr49
Explorer II
Explorer II
Older Beaver Marquis had 505 hp Cat C-12 later Patriot thunder and Marquis models go to 600 hp but not sure if any are 40'....might be larger.
Dick

2002 43' DP Beaver Marquis Emerald Cat C-12 505 HP, 1600 Tq
2003 Jeep Grand Cherokee Overland ---toad