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Old 09-04-2016, 06:46 PM   #1
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Cummins

Hi Everyone, I'm looking at a 2007 Holiday Rambler 37 ft. with a 300 cummins, can I get some feedback on peoples thoughts on that engine and if any of you have had a 300 hp cummins in a 37 ft. or any length for that matter and how it did power wise etc.Thank you
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Old 09-04-2016, 06:57 PM   #2
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300 hp can be either a ISB or ISC but probably an ISB. Will get you there with good fuel mileage but will slow down quite a bit on uphills.
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Old 09-04-2016, 07:42 PM   #3
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I have a 2007 38' Sportscoach Crosscountry. I tow a 2012 Chevy Equinox with no problems in eastern USA. It has enough power to go through the Smoky Mts with no problems. I get above 10 MPG towing, I have been very pleased with the set up.
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Old 09-04-2016, 07:52 PM   #4
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engine

Does it have the 300 cummins
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Old 09-04-2016, 08:16 PM   #5
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Quote:
Originally Posted by codybones0 View Post
Hi Everyone, I'm looking at a 2007 Holiday Rambler 37 ft. with a 300 cummins, can I get some feedback on peoples thoughts on that engine and if any of you have had a 300 hp cummins in a 37 ft. or any length for that matter and how it did power wise etc.Thank you

This is most likely the engine:

https://cumminsengines.com/uploads/docs/4971102.pdf

Just guessing but is it this coach:

http://holidayrambler.com//library/2...07_neptune.pdf

If so just be aware that there was a safety issue with the RR4R chassis that the Neptune was built on. There is as after market fix by Source Engineering.
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Old 09-04-2016, 08:31 PM   #6
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neptune

Yes that is the one, What kind of trouble were they having with the chassi was it very common or just rarely
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Old 09-04-2016, 08:39 PM   #7
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Yes that is the one, What kind of trouble were they having with the chassi was it very common or just rarely

The trailing arms were under engineered and there were many failures. You should call these guys and talk to them. The owners developed the repair kit and they both worked for Monaco at one time. They are very knowledgeable.

http://sourcerv.com/trailing_arm
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Old 09-04-2016, 08:47 PM   #8
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Doesn't Henderson also have something for RR4R?
I have been happy with everything I have ever purchased from Source.
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Old 09-04-2016, 09:03 PM   #9
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Thanks very much that's good info, since you have been around RVs for awhile what do you think of 300 hp in that 37 ft?
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Old 09-04-2016, 09:47 PM   #10
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Thanks very much that's good info, since you have been around RVs for awhile what do you think of 300 hp in that 37 ft?

It's all about the weight. The Neptune had a GVWR of 27,500 pounds. It's rated to tow up to 10,000 pounds. If loaded up to its max rated weights it would be significantly under powered. The rule of thumb is that a coach should have one hp per 100 pounds of load. If the coach weighted 26,000 pounds loaded with your stuff and you towed a car weighing 4000 pounds you would be right at that number.

It's really about expectations. I'm guessing that it would be adequate but wouldn't blow your socks off.
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Old 09-05-2016, 01:06 PM   #11
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Steve gave a good answer. 100 lbs/hp is the rule of thumb for motorhome power, but that is what I would call minimally adequate. Fine for the flats but pokey on grades above about 3%. Oh, you will get top the top OK with 100:1 power, but you may be going 35-40 mph. Probably 98% of the rigs you will look at are in that weight/power range, though, so don't fret too much about it. Some small coaches (low unladen weight) will be notably better, and some high end models may have an optional engine with more power, but most in the middle will be close to the 100:1 ratio.

By way of comparison, your car is probably under 20:1 weight/Hp ratio. Much better acceleration and hill climbing, of course.
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Old 09-05-2016, 04:12 PM   #12
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300 hp can be either a ISB or ISC but probably an ISB. Will get you there with good fuel mileage but will slow down quite a bit on uphills.
Ye, HP is no help with Cummins, some engines, depending on age, can be any one of three engines...ISB, ISC or ISL.
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Old 09-05-2016, 04:21 PM   #13
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Why not ask his question on the Cummins Forum, down the line?
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Old 09-06-2016, 03:29 PM   #14
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My experience with those trailing arms...

RV Breakdown - Not Enough Muscles in those Arms

My '04 38' has a 330 Cummins and does well going up hills, although I wish it had more of an engine brake coming down especially those on I-70 west of Denver. You should have plenty of power, just keep it well maintained and serviced including the trans and all will be fine.
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