Question Mountain Aire Cummins ISX?

Welcome to RVForums.com

  • Register now and join the discussion
  • Friendliest RV Community on the web
  • Modern site for PC's, Phones, Tablets - no 3rd party apps required
  • Ask questions, help others, review campgrounds
  • Get the most out of the RV Lifestyle
  • Invite everyone to RVForums.com and let's have fun
  • Commercial/Vendors welcome
Joined
Jul 27, 2019
Messages
3,905
Location
Midlothian, VA
RV Year
2017
RV Make
Newmar
RV Model
Ventana 4037
RV Length
40' 10"
TOW/TOAD
2017 Chevy Colorado
Fulltimer
No
Is the ISX in the MADP the same engine as in the higher line coaches just tuned down to 500 HP?
 
Joined
Nov 15, 2019
Messages
3
Different engines. The MADP is an X12 or 12 liter rated for up to 500hp
The higher line engine is the X15 or 15 liters rated up to 605 hp
Sure would like to have the X15 in my DSDP! lol


Sent from my iPhone using Tapatalk

Robert & Sandy Spence
Acworth,Ga
2016 Newmar Dutch Star 4369
2019 F250 Super Duty
2015 Jeep Wrangler JKU
 
Joined
Nov 2, 2019
Messages
2,584
Location
WA, MT or somewhere else!
RV Year
2018
RV Make
Newmar
RV Model
Mountain Aire 4047
RV Length
40'
TOW/TOAD
2014 Honda CR-V
Is the ISX in the MADP the same engine as in the higher line coaches just tuned down to 500 HP?
Yep; just smaller displacement. ISX-15 (KA/Essex/LA) is a 15-liter engine rated to 600-605 HP while the ISX-12 in the MADP is a 12-liter (actually 11.9-13 liters, depending on configuration) rated at 500 HP. They were replaced in 2019 with the X-15 and X-12versions. Pretty much the same engines as the earlier versions, but a bit lighter.

TJ
 
Joined
Nov 19, 2019
Messages
143
Location
New Braunfels, TX
RV Year
2020
RV Make
Newmar
RV Model
Dutch Star 4081
RV Length
40
TOW/TOAD
Jeep Grand Cherokee Trail Hawk
When I was attending Spartan Academy, the question was asked about the possibility of seeing an X-15 in a 40 or 43 foot coach. The answer was “no, it wouldn’t fit”.


Sent from my iPad using Tapatalk
 
Joined
Jul 27, 2019
Messages
3,905
Location
Midlothian, VA
RV Year
2017
RV Make
Newmar
RV Model
Ventana 4037
RV Length
40' 10"
TOW/TOAD
2017 Chevy Colorado
Fulltimer
No
While at Cummins for my recent head gasket repair I inquired about the ISX (assuming the 605 of course). They didn't speak highly of it as they said it's too much for a RV, it runs too hot. Also had the piston issues in the past which they said Cummins corrected. Of course this is one service tech's opinion just like the various opinions on tire pressure. I was just curious how the service history of the ISX (15) compared to the ISL.
 
Joined
Nov 19, 2019
Messages
143
Location
New Braunfels, TX
RV Year
2020
RV Make
Newmar
RV Model
Dutch Star 4081
RV Length
40
TOW/TOAD
Jeep Grand Cherokee Trail Hawk
The same block that is now the X-15 605 was previously the 650. I think Cummins “fix” for the piston issue was to down-rate the engine.


Sent from my iPad using Tapatalk
 
Top