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Old 04-16-2013, 09:37 PM
GG386 GG386 is offline
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Engine warm-up time

What's the rest of you seeing for a typical operating temperature warm up cycle from a cold start (20 degrees F)? Granted, I'm more used to a quick diesel warm up, but the other gas stuff in the garage aren't that cold blooded.

We're talking 10 minutes and the needle isn't moving, and come to think of it, the trns temp. takes it sweet old time too. Just curious if this common in the 6.2 or possible a sensor acting up. Do these even have a thermostat like we would see in most vehicles or some kind of valve/chip thingy that will take an act of congress to fix?
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Old 04-16-2013, 10:09 PM
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I too have waited for several minutes to see how long it would take to get the engine and tranny warmed up. Both seem to only get there once I start moving.
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Old 04-17-2013, 04:28 AM
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Mine the needle moves in less than 5 minutes! But I usually just get in and go.
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Old 04-17-2013, 05:39 AM
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In those temps, sitting mine seems to take about 10 mins or so before the needle moves, but if I get in and drive it as posted above, I have hot air after a few minutes/mile or 2 of driving. My trans temps on the other hand take much longer, never timed it though..

Not sure what you mean by you being used to a quick diesel warm up, my limited experiences with them (mostly friends/family that have them) and from what I've read here has me believing they take forever to warm up.
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Old 04-17-2013, 09:44 AM
GG386 GG386 is offline
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The one and only time that it was given a warm-up session (~ 10 min.) it was as if it was just started- no movement at all on the gauges. Now it gets the driveway warm up from my shop to the road, (little under a mile) and it does seem to get heat in it faster that way.

Matt, the diesels would all begin to have tranny heat in them fairly quickly with water temperature not far behind. Comparing the 6.2, there's a noticeable lag. Getting up to cruising speed w/6.2 (while cool) shows no signs of bogging/hesitation like the 6.0 would. I'm sure getting heat into a forced induction motor's exhaust will probably play a role too, just say'n.

Are the radiator/coolers configured differently from gas to diesel? This may have happened with the 2011 model change, but it's not at all like the 07. One more thing, i swear that motor sits back a foot farther than my 07, and it shows up in the cabin- kind of tight!
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Old 04-17-2013, 02:45 PM
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The one and only time that it was given a warm-up session (~ 10 min.) it was as if it was just started- no movement at all on the gauges. Now it gets the driveway warm up from my shop to the road, (little under a mile) and it does seem to get heat in it faster that way.

Matt, the diesels would all begin to have tranny heat in them fairly quickly with water temperature not far behind. Comparing the 6.2, there's a noticeable lag. Getting up to cruising speed w/6.2 (while cool) shows no signs of bogging/hesitation like the 6.0 would. I'm sure getting heat into a forced induction motor's exhaust will probably play a role too, just say'n.

Are the radiator/coolers configured differently from gas to diesel? This may have happened with the 2011 model change, but it's not at all like the 07. One more thing, i swear that motor sits back a foot farther than my 07, and it shows up in the cabin- kind of tight!
I see what you're saying, you're comparing the speed (ratio) at which the water/trans warm up times are between the 6.2 vs 6.0. I thought you were comparing gas vs diesel warm up times in general.
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Old 04-17-2013, 04:21 PM
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I thought you were comparing gas vs diesel warm up times in general.
Actually I was, just thru the trans info in as a side note.

Unless I'm missing something, a minute of idling combined with 2-3 miles of city driving should be enough to start showing up on the metering. Asking only if this is common with other member's 6.2's- just seems a bit odd that the motor takes so long to get up to a usable temp.
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Old 04-17-2013, 05:30 PM
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Mine is warm enough to move the needle within 1-3 minutes of driving which is about 120* according to the scangauge.

The 06 Duramax I had took a while to warm up and would actually cool off sitting at lights when the temps were about 50* or below outside. I remember one winter where it actually cooled off so much the heater wasn't even blowing warm air. It took way longer than the 6.2 to warm up, no questions asked. The Dmax also felt really sluggish when it was cold where the gas engine feels no different to me. The Allison trans in that truck also ran much cooler than the SD does. It rarely ever went over 175 even towing in summer stop and go traffic where the SD seems to stay around 195-210. Not sure what the capacity of the TorqShift is, but the Allison held almost 5 gallons of fluid between the converter and a deep pan which explains why it takes so long to warm up.
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Old 04-17-2013, 06:35 PM
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Quote:
Originally Posted by GG386 View Post
Actually I was, just thru the trans info in as a side note.

Unless I'm missing something, a minute of idling combined with 2-3 miles of city driving should be enough to start showing up on the metering. Asking only if this is common with other member's 6.2's- just seems a bit odd that the motor takes so long to get up to a usable temp.
That contradicts everything I've read/heard about gas/diesel warm up times. That's why the 6.7's have supplement heat offered...

So yeah, it sounds like something may be up with yours, maybe the thermostat is stuck open or something, I dunno.
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Old 04-17-2013, 08:30 PM
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maybe its the cast iron block that takes longer to heat up?
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Old 04-17-2013, 10:11 PM
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I would imagine your thermostat is sticking. I know mine is but haven't had time to get it in. It would peak at 188 then end up dropping down to 177, and cool down to 170 at stop signs. constantly varied the past weeks that I drove it. Never got above 186 unless cruising at 75 and climbing hills.
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Old 04-18-2013, 10:42 AM
GG386 GG386 is offline
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It very well maybe the thermostat or whatever device that's actually controlling it- just can't get wrapped around the idea that modern stuff is still using the treated spring method thats been around for 100 years now.

Not to beleaguer the point, my experience with diesel temp. is quicker during WARM UP and once underway tend to loose some of their heat. The OTR guys, that have trucks with motorized vanes, usually are closed (ambient dependent) ripping down the highway and tend to open in town/idle. Unscientific by a long shot, an observation & with some real world driving is all.

To feed off this, would anyone know if the 6.2 and the 6.7 have the same cooling system in the SD's? Did notice that the new one has a canted radiator and looks to be aluminum....
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Old 04-18-2013, 12:39 PM
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I'm sure the 6.7 has a radiator with more capacity. It has massive oil coolers and EGR coolers and you need to get that heat in addition to the heat from combustion out of the system where the gas engine only has a small (by comparison) oil cooler to deal with IIRC.

Plus the diesel has an intercooler in front of the rad which probably also requires it to have a higher capacity radiator.
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Old 04-18-2013, 12:39 PM
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