6.7 Very warm

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Jul 13, 2015 | 11:19 PM

Boaterguy

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Laughing Gas

Joined: Oct 2014

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From: Middle TN

6.7 Very warm

Hi everybody. This isn't really a concern, I am just curious. I have a 2015 Super Duty 6.7 PSD with 11,000 miles on the clock. When this truck is parked after driving it for the 20 mile commute, the engine stays hot for a very long time. If I go out to the garage 3 or 4 hours later, the hood and front clip are still very warm to the touch. What takes these engines so long to cool down? None of the gassers I have owned are like that.

Jul 13, 2015 | 11:56 PM

kper05

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Joined: Jan 2010

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There is a lot of mass to these engines so they hold heat for quite a while, especially when it's hot outside. Even though, based on my understanding, CGI blocks do dissipate heat better, the engine is most efficient when it's hot so it's designed to hold heat where it can and the primary cooling system maintains the correct temperatures based on load. Also, sitting in a garage after shutdown, there isn't any air being forced through the engine bay. Mine is still warm five hours later in the garage because it's at least 90°F in there.

Jul 14, 2015 | 12:07 AM

Boaterguy

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Laughing Gas

Joined: Oct 2014

Posts: 962

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From: Middle TN

Thanks for the reply, that does sound right since it is hot out here in the desert.

Jul 14, 2015 | 07:19 AM

ruschejj

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Joined: Jan 2009

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From: Greenwood, SC

I'm amazed every time I drive it, I will drive 400 miles with a trailer in tow, oil temp steady at 228° all day. The next morning I will go outside to look things over and it's still warm. There's just over 3 gallons of oil and approx 12 gallons of coolant (I think) in addition to al that metal, takes a long time to get rid of the heat with all that mass.

I think it's designed to retain heat and to stay in a specific temp range. Gas engines make a lot of heat too but have far less mass and also are made to get rid of heat quicker.

Then there's the simple scientific fact, 400 horsepower makes a lot of heat. If I were smart I would know the BTU value of 1 horsepower, would be interesting to know how much heat these engines actually do make.

Jul 14, 2015 | 10:46 AM

Boaterguy

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Joined: Oct 2014

Posts: 962

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From: Middle TN

228?? Wow, I didn't know these trucks ran that hot. My model is the XLT so I don't have the interactive display that gives me that info. I have to rely on the Guage that is always in the middle. May be a good thing because that would take some getting used to. I installed after market guages in my '04 V10 and towing a heavy trailer out here in the desert it was very rare I saw anything north of 200 degrees.