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 > 275 HP Cummins diesel on a 31' coach

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discovery4us

California

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Posted: 09/27/18 01:31pm Link  |  Quote  |  Print  |  Notify Moderator

Transmission also plays a crucial role. fellow travelers had a 2001 expedition same motor as our DP but the 5 speed Allison compared to our 6 speed Allison. They could not keep up with us. Now they have a 34' vista with the 6.7 cummins and 6 speed Allison and I can not keep up with them.

I have also heard as a rule of thumb for DP that you need 10 HP per foot of MH.

bass n bob

new york state

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Posted: 09/27/18 07:05pm Link  |  Quote  |  Print  |  Notify Moderator

I have a 36 foot DP with a 300HP engine. Over 40000 miles in 3 years including coast to coast twice. Faster accelerating than my gasser and better on hills and of course quieter. What I love the most is averaging 11 MPG's towing. I towed a 4 door wrangler and recently upgraded to a Grand Cherokee. I love the set up. Good luck with your decision.

Lambogojo

Missouri

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Posted: 09/30/18 07:15pm Link  |  Quote  |  Print  |  Notify Moderator

here is how I view HP and torque.

Horsepower is how fast you can go, and torque is how fast you can get to max speed. 500 ft lbs of torque is going to be enough for your motorhome, the issue may come into towing a vehicle. what transmission does it have??

dmatt

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Posted: 10/01/18 11:38am Link  |  Quote  |  Print  |  Notify Moderator

It has the Allison 6 sp transmission with OD


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Lambogojo

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Posted: 10/01/18 12:03pm Link  |  Quote  |  Print  |  Notify Moderator

Id check to see if your transmission has the ability for a more aggressive shifting pattern. doesnt add power to your rig, but it would use the power you have more efficiently.

dmatt

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Posted: 10/03/18 01:06pm Link  |  Quote  |  Print  |  Notify Moderator

Lambogojo wrote:

Id check to see if your transmission has the ability for a more aggressive shifting pattern. doesnt add power to your rig, but it would use the power you have more efficiently.


Thanks, will look into that when we check it out.

samuraitowd

Washoe Valley, NV, USA

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Posted: 10/07/18 10:01am Link  |  Quote  |  Print  |  Notify Moderator

Thanks for the info. We are looking for a 31' Tiffin Breeze also as our first DP. Learned a lot.


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faucet1

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Posted: 10/09/18 03:21pm Link  |  Quote  |  Print  |  Notify Moderator

Don't know about the 6.7, but the 5.9 Cummins had a problem with cracking of the Manifold due to heat. In the MH application, the 5.9 units couldn't get proper cooling and caused the Manifold to get hot, warp, crack. That particular setup had the engine torque at 660 ft-lbs. Don't know if the newer 6.7 may have some of the same problems. Hopefully, the manifolds are much improved. I suppose the higher weight Coaches made that engine have to work harder. FWIW.


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gsf35099

Granite Shoals, TX

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Posted: 10/09/18 06:07pm Link  |  Quote  |  Print  |  Notify Moderator

I finally put my 5.9L Cummins 300hp w/5 speed Alison combo to the test this past week and was rather impressed.
Drove Hwy 65 N in Arkansas from I-40 to Harrison, AR & back ~105 miles one way. Pretty country and some steeeeep long hills pulling my 3200 lb cargo trailer with 2 Harley's & a golf cart.
Even caught the only light in a small town at the base of one hill. Didn't break any speed records, but eventually sped up to 43 mph by the time I got to the top. Never once overheated or let me down. I was stressing out at first knowing I was starting this steep long climb from a dead stop. [emoticon].
Actually drove much better than I expected.


2005 Damon Astoria 3679
300 Cummins ISB 5.9, Allison auto 5 speed

Life is to short not to have a good time and enjoy!!!

dmatt

Ventura County, CA

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Posted: 10/10/18 03:50pm Link  |  Quote  |  Print  |  Notify Moderator

Well, even though you have 25 more HP that the Breeze, I think it should be ok since the Breeze is shorter and lighter. I haven't read anyone saying they were disappointed with the performance.

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