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Old 09-23-2017, 05:07 AM   #1
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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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Old 09-23-2017, 07:06 AM   #2
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I run about 185 cruising and have not seen 200 even on long steep pulls.
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Old 09-23-2017, 07:16 AM   #3
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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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Old 09-23-2017, 08:41 AM   #4
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Quote:
Originally Posted by hypoxia View Post
I run about 185 cruising and have not seen 200 even on long steep pulls.


Same here, but I only have 525 Hp in my coach.

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Old 09-23-2017, 08:54 AM   #5
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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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Old 09-23-2017, 09:18 AM   #6
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what's "a long, hard pull"?
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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Old 09-23-2017, 09:31 AM   #7
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Quote:
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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.
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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Old 09-23-2017, 01:35 PM   #8
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600 HP operating temp

Quote:
Originally Posted by Mr_D View Post
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.

Wow gaining speed on a grade like that impressive.
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Old 09-23-2017, 05:46 PM   #9
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I'm at about the same weight if you include the CR-V.
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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Old 09-23-2017, 07:49 PM   #10
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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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