6.7L engines relatively slow to warm up - why? - Diesel Forum - TheDieselStop.com
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6.7L Power Stroke Engine and Drivetrain Discussion of the 6.7L Power Stroke diesel engine and drivetrain in the 2011-Up Super Duty trucks. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.7L Power Stroke engine.

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Old 11-21-2010, 05:42 PM   #1 (permalink)
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6.7L engines relatively slow to warm up - why?

Finally got my new F-450 KR which I am absolutely loving. I have a lot of observations about this truck relative to my 99 F-250 with 7.3 but in this post I will confine my topic to how fast the engine warms up after starting when cold out. I do have the rapid heat supplemental heater which works well (dual alternators). Having said that, I wonder why this engine seems to be so much slower to warm up (as evidenced by the temperature guage) compared to the 7.3. I have a couple of theories about this:
1. The thermodynamic efficiency of this engine is greater and more of the heat energy is converted into piston travel than rejected into the cooling system
2. The warmup strategy for the 7.3 employs an exhaust backpressure valve which adds to the warmup
3. Since the 6.7 uses a DPF the timing may not be as retarded on startup in order to reduce particulate emissions
4. The 6.7 has a dual cooling system in order to facilitate the EGR and liquid cooled charge air cooler, and while not more efficient when fully warmed up, it may well have a greater total capacity which impedes the warmup
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Old 11-21-2010, 06:05 PM   #2 (permalink)
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its cold outside and it takes longer??

good thing you have heated seats
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Old 11-21-2010, 08:34 PM   #3 (permalink)
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Not sure if you are monitoring real temps or just the gauge on the dash. If it's the gauge, on my 02, the gauges were computer controlled to reflect relative temps. They stayed in the same place across a wide temp range. Apparently we are all too stupid to understand linear movement. The first summer I had my 02, the trans temp gauge never moved. In the winter, it started off all the way down and moved up as the truck warmed. I took it back to the dealer and he printed a bulletin that said the gauge would read "midway" for trans temp from 80^F to 220^F. In the summer, the temp was always above 80^ so the needle stayed in the middle. All the temp gauges read this way.
My 11 seems to have more "real" temp movement, but not sure..

j
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Old 11-21-2010, 08:48 PM   #4 (permalink)
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#2 is the biggest reason.
Diesels burn so little fuel that there hardly any combustion to create the BTU's to heat the water idling.
EBP did it for the 7.3.
Nothing works so well as driving it.
Pre-drive warm up made sense when oils were far less than they are now and truck transmissions used 90 weight lube.
Also warm-ups made some sense on gassers when they had manual choke and momma wasn't so good at fiddling with choke those first few minutes.

The emissions testing protocol has the engine started and then put under load in 15 or so seconds.
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Old 11-22-2010, 07:30 AM   #5 (permalink)
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Yep, definitely takes longer to warm up. My 2006 6.0 warmed up real toasty after 15 or 20 minuites of idling. I hope mine has good heat in the -35 weather.

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Old 11-23-2010, 03:15 PM   #6 (permalink)
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I noticed it too. Not sure if the 6.7 is any worse but I was driving quite a bit and noticed it still wasn't up to temp either trans or engine...Normal I guess.
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Old 11-23-2010, 03:48 PM   #7 (permalink)
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It seems to take longer than any of the previous vehicles I've owned. However, the gauges are better - as I watched them compared to the digital readout of the exact temp. (Unless those are faked too)
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Old 11-23-2010, 04:31 PM   #8 (permalink)
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I may try and rig up the front grill cover to fit my 11' since I havent been able to sell it.
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Old 11-23-2010, 07:51 PM   #9 (permalink)
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Does this trucks have a auto Idle up like the 6.0 does. My 06 would idle up when it was cold but I don't think this one does.
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Old 11-25-2010, 07:17 PM   #10 (permalink)
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Quote:
Does this trucks have a auto Idle up like the 6.0 does. My 06 would idle up when it was cold but I don't think this one does.
Mine started to go onto fast idle at about -15C (about 5F). It reves up to 1000 or 1200 rpm.

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Old 11-26-2010, 02:46 PM   #11 (permalink)
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Being in FL its not a big deal, but even in 80*F weather it takes me about 6-8miles before I get my Oil Temp up to 195-199*F. Idling wont do crap, for about 10-15mins of idling Oil Temps are still >150*F
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Old 11-26-2010, 03:07 PM   #12 (permalink)
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it does have a high idle mode it was like 8 deg the other day it kicks right on as soon as engine is turnd over. Also it does take a long time to warm up idl for 10 mins seems like nothing, have to dive 10 miles at 75 to get warm. One of mine main concens is the truck really seems to get a diesel smell in the cab anyone else have this issue? It is real strong and likes to choke u and give a good headake?
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Old 11-26-2010, 08:15 PM   #13 (permalink)
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Originally Posted by alexstroker View Post
it does have a high idle mode it was like 8 deg the other day it kicks right on as soon as engine is turnd over. Also it does take a long time to warm up idl for 10 mins seems like nothing, have to dive 10 miles at 75 to get warm. One of mine main concens is the truck really seems to get a diesel smell in the cab anyone else have this issue? It is real strong and likes to choke u and give a good headake?
Should not be getting any diesel odor in the truck, get it checked!
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Old 11-26-2010, 10:12 PM   #14 (permalink)
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Quote:
Originally Posted by alexstroker View Post
it does have a high idle mode it was like 8 deg the other day it kicks right on as soon as engine is turnd over. Also it does take a long time to warm up idl for 10 mins seems like nothing, have to dive 10 miles at 75 to get warm. One of mine main concens is the truck really seems to get a diesel smell in the cab anyone else have this issue? It is real strong and likes to choke u and give a good headake?
I've heard this on some other sites, get it check ASAP!
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Old 11-27-2010, 04:42 PM   #15 (permalink)
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I've run SEIC @ 1,400 RPM's many times and I never smell diesel in the cab and never smell it driving (or whatever we want to call this post-DPF diesel smell).
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