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Old 09-12-2006, 08:48 PM   #1 (permalink)
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350 horse Cummins

We just bought a Fleetwood diesel pusher motorhome on a Freighliner chasis.
It has a 350 horse Cummins and 6 speed Allison. It weights 31000 lbs dry.
Is it possible to chip this motor to 400 hp? without reliability?
I'm not trying to hot rod but I can appreciate a little more power.
Thanks
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Old 09-12-2006, 10:24 PM   #2 (permalink)
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Re: 350 horse Cummins

what year is it???? I take it its a bigger cummins not the 5.9???


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Old 09-12-2006, 11:34 PM   #3 (permalink)
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Re: 350 horse Cummins

If this is one of the larger engines, most of them can be turned up at a authorized cummins dealer.
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Old 09-13-2006, 07:01 AM   #4 (permalink)
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Re: 350 horse Cummins

If it is a ISM (M11 if its older) it can go to 400hp, IF the allison torque rating will stand it. I would do some checking before you have cummins turn it up, also if its under warranty I would leave it alone.
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Old 09-13-2006, 10:11 AM   #5 (permalink)
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Re: 350 horse Cummins

My Mistake.
It's A Catipillar C7 7.2 litre in a 05 chasis.
I finally took a look and saw the yellow paint then looked at the manual.
The salesman didn't know the difference.
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Old 09-13-2006, 10:40 AM   #6 (permalink)
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Re: 350 horse Cummins

350 out of that tiny motor is already a fire breathing monster...probably only available in RV and I am sure it is maxed out at that. Let it be for your wallet's sake

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Old 09-13-2006, 10:45 AM   #7 (permalink)
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Re: 350 horse Cummins

Is that the same engine as the trouble ridden 3126? If it is I would stay away from that thing, I have never seen one make 300k without head trouble.
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Old 09-13-2006, 01:21 PM   #8 (permalink)
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Re: 350 horse Cummins

Basically, yes but with lots of improvements, however they are still known for breaking a lot, probably in no small part due to the excessively high output they often are rated at.

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Old 09-13-2006, 08:07 PM   #9 (permalink)
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Re: 350 horse Cummins

You bought an RV without knowing which engine it has and trusting the dealer? Wow...
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Old 09-13-2006, 08:25 PM   #10 (permalink)
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Re: 350 horse Cummins

in his defense, if it's new and your not going to do any repairs yourself and it's under warranty, who cares what brand it is? Granted I would have at least looked but hey [img]/ubbthreads/images/graemlins/shrug.gif[/img]. Cat or Cummins your not going to go wrong with either. And yes 330 is the highest factory rating for the C7 (fire and RV only) but if you want more, TS Performance makes the MP-8 box for it.
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Old 09-13-2006, 10:30 PM   #11 (permalink)
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Re: 350 horse Cummins

I wish you hadn't said anything engine worries.
However the manual says it has a 6 year or 6000 hour warranty.
I hope I don't have to use it.
I won't be changing my own oil I expect either. The manual mentions several different capacity pans but another RVer with the same motor says 19 gallons. Good grief.
The cooling system won't have to be flushed according to the manual for 300,000 miles. I think that is what I read last night. Haven't read far enough yet to know if it's got a cooling system filter but suspect it has with such a high mileage before changing coolant.
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Old 09-14-2006, 11:34 AM   #12 (permalink)
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Re: 350 horse Cummins

Not 19 gallons, 19 quarts probably.

For insurance sake I just drain and refill coolant annually because I have had so many problems with corrosion, plugging, etc. I want to keep it fresh.

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