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View Poll Results: Which brand is your favorite diesel?
Cat 2 8.33%
Cummins 20 83.33%
Detroit 2 8.33%
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Old 10-20-2020, 12:17 PM   #1
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Question Which Engine For Towing?

I've got a good question for everyone. We race winged sprint cars and are planning on purchasing a triple axle stacker trailer/different rv to pull it. Which engine and hp setting would y'all recommend? A Cat C15, C12, beefed up c7, or a Cummins ISX15, M11, ISL 8.9, beefed up 8.3 or a Detroit or ????? I want to hear everyone's choice and why. Thanks in advance!
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Old 10-20-2020, 12:30 PM   #2
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You'll need to consider transmission ratings and chassis towing capability too.

The C-7 would probably only have a 3000 Series Allison and have limits on the size of trailer .
Many older Chassis with the small Cat could have only a 5,000# trailer limit.

So you'll want at least a 10,000# trailer tow capacity and that should come in a chassis with the 4,000 series Allison .

Personally , 40' coach with tag axle; to help handling with a large trailer ; a pre DEF engine , pre DPF if possible .
450 +HP , ISL 9 , Allison 4,000 . I don't know if this unit exists.
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Old 10-20-2020, 12:58 PM   #3
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Any one of your options can do the job, however, 400-450 HP and up is better. I used to tow a 12,000# enclosed trailer with my 450 hp ISL 8.9 w/3000 Allison up over the Loveland pass west of Denver. At some points, I was down to 37 mph, but still got to my destination. Neither the engine or the transmission overheated. Much will depend on how heavy your combined weight will be. At the time, my sons Mountain Aire with 500 hp could not keep up with me due to weighing 6,500# more. The heavier the coach, the more hp needed to get it up the hill.
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Old 10-20-2020, 02:25 PM   #4
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Detroit 60 if you can find one until till 2008. The ISL is only 1200-1250 torque...Detroit is 1650. The Cummins ISX has serious #6 valve problems...$$$$ The big Cats have twin turbo problems.

The big Monaco’s, Beaver’s & HR have a very stout hitch and plenty of CCC and combined weight. Might want to look at this post: https://www.irv2.com/forums/f115/hau...co-505397.html
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Old 10-20-2020, 02:58 PM   #5
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Look at Bluebirds with a 60 series Detroit or if you want to go older a 40' PT with a 8v92 turbo. Tag axle makes a big difference towing. No wander.
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Old 10-20-2020, 04:13 PM   #6
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You left out some options. M-11 and Cat C-9.

Either way, I ride ATV/UTV with 2 people who pullntri axel 24ft stickers. 1 has C9 and 1 has 400ISL both with 3000 series trans. They do fine.
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Old 10-20-2020, 04:23 PM   #7
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Agree DD Series 60.
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Old 10-20-2020, 04:31 PM   #8
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Look for a 2004-2008 Monaco Signature, Monaco Executive, or Holiday Rambler Navigator with the optional Detroit Series 60 515hp engine. The Detroit Series 60 was an expensive option, so you'll have to look hard.
If you want the ultimate in power, then look for a 2004-2009 Beaver Marquis with the Caterpillar C15 engine. These engines are so powerful they had to limit the torque so they did not exceed the Allison MH4000 limit of 2000 ft lbs.

Hope this helps!
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Old 10-20-2020, 05:10 PM   #9
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I've owned two motorhomes with the Cummins, one with M11 and one with ISM (just a newer version of the M11). The M11 had over 200,000 trouble free miles when we traded it. The ISM now has 65,000 trouble free miles. The M11 was teamed with a B500 allison, which is basically a 4000 series Allison. The ISM has a 4060 Allison. Had no issues with either Allison. Towed a 24ft car trailer loaded to max with both units. Very good engine until they started with the emissions crap.
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Old 10-20-2020, 05:11 PM   #10
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A triple axle stacker trailer, depending on size, could easily have a 20K GVWR....

You're going to need some towing power...

I'll also vote for the DD13 505HP in a newer motorhome, or at least 500HP in an older pre-emissions (pre-2008ish) motorhome, with a towing capacity of 20K+...

Sounds like a fun project... enjoy the search...!
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Old 10-20-2020, 05:19 PM   #11
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Old 10-21-2020, 11:43 AM   #12
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Thanks for all the replies. I had wondered which brands used the bigger C15 Cats and Detroits. I have looked at several with the m11 in them.
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Old 10-21-2020, 12:00 PM   #13
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My next question would be which engine/RV combo is best on fuel when towing?
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Old 10-21-2020, 12:19 PM   #14
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That is easy. NON of them will be good with 500 or so hp in a 40' or so tag axle coach and that trailer. I would guess the lighter coach but that probably won't be by much.
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