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09-23-2017, 05:07 AM
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#1
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Senior Member
Join Date: May 2014
Posts: 424
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600 HP operating temp
What would be the correct operating temp for the 600 HP Cummins, on a fairly level interstate highway at a speed of 65-70 mph in cruise control ?
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2017 London Aire 4519
2021 Wrangler Rubicon JLU
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09-23-2017, 07:06 AM
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#2
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Senior Member
Monaco Owners Club
Join Date: Sep 2013
Posts: 2,470
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I run about 185 cruising and have not seen 200 even on long steep pulls.
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2014 Newell 2020P 45'8" ISX 600 HP
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09-23-2017, 07:16 AM
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#3
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Moderator Emeritus
Jayco Owners Club RV Trip Wizard
Join Date: Oct 2009
Location: Poinciana FL
Posts: 7,781
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Generation makes a difference. Newer engines, both gas and diesel, will run hotter to help with emissions requirements.
Depending on outside temp and terrain ours will run from low to mid 180s to 210 - 215. The latter was seen this past summer season on hot days (mid to upper 90s) and long steep grades. Typical freeway speeds, summer temps, somewhere in 190s.
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Jay and Peggy Monroe
"Can't take it with you, not leaving any behind"
2024 Jayco White Hawk 26FK
2024 Ford Expedition
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09-23-2017, 08:41 AM
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#4
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Senior Member
Monaco Owners Club
Join Date: Jan 2012
Location: .
Posts: 789
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Quote:
Originally Posted by hypoxia
I run about 185 cruising and have not seen 200 even on long steep pulls.
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Same here, but I only have 525 Hp in my coach.
C&SL
05 Sig
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09-23-2017, 08:54 AM
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#5
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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I have the '07 EPA DOHC, what's "a long, hard pull"? I haven't found one yet that strains the engine/trans. I don't think I've ever seen anything over 193°.
Usually run just less than 185° in the flats.
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2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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09-23-2017, 09:18 AM
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#6
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Senior Member
Monaco Owners Club
Join Date: Sep 2013
Posts: 2,470
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Quote:
Originally Posted by Mr_D
what's "a long, hard pull"?
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That's when I'm down to 40MPH on a 6%+ grade just droning along for a while with a combined weight of about 54,000 Lbs. and the transmission in economy mode.
The 600 is about 15 MPH faster than the 350 ISC in my last coach on those grades. It was also 15,000 lbs. lighter at around 39,000 Lbs. combined.
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2014 Newell 2020P 45'8" ISX 600 HP
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09-23-2017, 09:31 AM
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#7
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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Quote:
Originally Posted by hypoxia
That's when I'm down to 40MPH on a 6%+ grade just droning along for a while with a combined weight of about 54,000 Lbs. and the transmission in economy mode.
The 600 is about 15 MPH faster than the 350 ISC in my last coach on those grades. It was also 15,000 lbs. lighter at around 39,000 Lbs. combined.
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I haven't found a grade yet that slowed me down that much with the ISX and I'm at about the same weight if you include the CR-V. In fact I can gain speed on a 6% grade if I want to waste the fuel.
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2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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09-23-2017, 01:35 PM
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#8
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Senior Member
Fleetwood Owners Club American Coach Owners Club
Join Date: May 2015
Posts: 245
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600 HP operating temp
Quote:
Originally Posted by Mr_D
I haven't found a grade yet that slowed me down that much with the ISX and I'm at about the same weight if you include the CR-V. In fact I can gain speed on a 6% grade if I want to waste the fuel.
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Wow gaining speed on a grade like that impressive.
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2004 Travel Supreme DS04
2014 Jeep Grand Cherokee Summit
2002 Newmar DSDP 4095 Cummins ISC 350
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09-23-2017, 05:46 PM
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#9
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Senior Member
Monaco Owners Club
Join Date: Sep 2013
Posts: 2,470
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Quote:
Originally Posted by Mr_D
I'm at about the same weight if you include the CR-V.
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My toad is 7,000 Lbs and the coach is 47,000 Lbs.
It amazes me that the temperature doesn't move much in the summer pulling a grade like that. That is a lot of heat to dispense.
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2014 Newell 2020P 45'8" ISX 600 HP
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09-23-2017, 07:49 PM
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#10
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Senior Member
Texas Boomers Club Holiday Rambler Owners Club
Join Date: Jun 2002
Location: What? Like right now? ;-)
Posts: 1,302
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Yes, tier 4 motors will run at least 15 degrees hotter. I dont own a 600 but its nice to keep all diesels in the 185-200 range max.. gives some head-room.
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2003 Scepter 40PDBB - Roadmaster RR8S - Cummins ISC350 - purch aug16
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