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Old 01-14-2013, 09:27 PM   #1
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Cummins vs Caterpillar

When considering a used Tiffin Class A DP (2, is there a difference in performance and fuel consumption between these two engines? (2000 - 2008) Assuming all other variables are the same.
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Old 01-15-2013, 02:52 PM   #2
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Cummins, 8.3l vs Cat 3126 or the newer C-7 , the Cummins has more torque, and IMHO, would be better for a heavy coach, That being said, having been a Dodge Cummins mechanic and now a Cat powered coach owner, I would not let the engine type stand in the way of a good deal .
MPG. at 9> 9.5 I'm happy, don't know what similar Cummins powered rigs are getting. Several 5.9 Cummins owners claim more, MPG, but for my $ I'll pay for the extra power.
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Old 01-15-2013, 03:10 PM   #3
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I had a Phaeton with CAT C7 (350 HP) - performed beautifully and got 9+ mpg whether towing or not, keeping it 65 mph or lower. Now, I have a Cummins (07 Allegro Bus) 400 HP and get 7.5 mpg at best. I'm not complaining the Bus is a much heavier coach with IFS and rides much nicer.
Happy RVing!
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Old 01-15-2013, 03:14 PM   #4
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the only difference i have ever noticed is the cat doesnt like to sit in the OFF mode and takes wee bit longer to start after a long off period


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Old 01-15-2013, 03:33 PM   #5
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the only difference i have ever noticed is the cat doesnt like to sit in the OFF mode and takes wee bit longer to start after a long off period
I agree!
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Old 01-16-2013, 09:12 AM   #6
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the only difference i have ever noticed is the cat doesnt like to sit in the OFF mode and takes wee bit longer to start after a long off period


i
After repeated starter relay failures, (2 in the first 6 months of ownership, not a Cat problem) I installed a starter relay bypass push button in the engine bay. Now if the relay fails again ; Murphies Law , it hasn't ; I don't have to craw under to by-pass the relay. I use the push button to crank the engine; ignition off ; after oil changes 20seconds to prime the oil filter, after extended shut, 2 weeks or more, down I use the manual fuel prime pump, 10 or so strokes of the pump , then spin the engine with the push button 10sec, then start with the key. Fires right up.
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Old 01-16-2013, 01:27 PM   #7
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I had a cummins in the last DSDP and now have a cat. Was worried about the less torque but have not had any problems so far. A bigger concern in the older coaches is whether it is a side or rear radiator. I do not like the rear radiators.
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Old 01-16-2013, 02:15 PM   #8
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Why don't you like the rear radiator?
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Old 01-17-2013, 09:20 AM   #9
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Why don't you like the rear radiator?
Engine access, paticularly items like belts , thermostats, alternators and water pumps.
Posters in the forums , report being charged $500.00 by shops to replace belts on rear radiator coaches, where on a side rad unit it's a 10 min DIY job.
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Old 01-17-2013, 09:30 AM   #10
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Ok thanks
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Old 01-19-2013, 08:04 PM   #11
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Quote:
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Engine access, paticularly items like belts , thermostats, alternators and water pumps.
Posters in the forums , report being charged $500.00 by shops to replace belts on rear radiator coaches, where on a side rad unit it's a 10 min DIY job.
The rear radiator needs to be cleaned at least once a year - I do mine twice a year and keep a close eye on the belts.
I also had a old trucker that told me to keep the foot out of the cat but put the throttle down on the cummins.

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