1650* EGT / Stock ??

[jnelson]

Pulled a load of 2 7/8 pipe casing up to Boulder Wyoming this week. I weighed gross combined around 27,000 lbs.



Pulling some hills on 287 out fo Ft. Collins Co. EGT's got up to 1650* until I got to the top of the hill. . This was without the EZ plugged in. I could hold the speed up and steady at 68 mph. On some hills I would feather the throttle to try to drop the temps. Should I worry? Seems a little hot even for a stock motor.



With readings like this I would guess I would not be able to use the Edge EZ at all?

Is there actually a box out there that will help my EGT's while pulling this heavier weight?



thnx Joe

 

[Bertram65]

You should not be able to do any harm to the engine if it is stock and you within the capacities of the truck. I think 27K is well over the rated capacity so you probably should have let off a little to try and bring the EGTs down some.

 

[jnelson]

I tried slowing down and down shifting but egt's would still climb. I had it at 1500 several times for an extended time. NO harm done I guess.

 

[R C Cola]

Engine Temps

First off good that you have a temp guage and watch it. I assume from the temp that your probe is pre-turbo. I think those temps might damage even a new truck if sustained. Some run high temps but the sad stories of others sound very expensive. When I bought my pyro I was instructed 1250 max !! :--) I am kinda wimpy, but those numbers scare me to death.

First off what gear were you in... . My guess is you were in 6th!! (bad plan)

The cummins likes to be in direct or lower if you are pulling a grade. 6th or overdrive puts a strain on everything especially temps.

When I start up a hill I watch the temps close and at or below 1200 always drop into direct (in your case 5th). The temp immediately drops at least 210 degrees and if it climbs back up I will drop another gear. I like to be able to accelerate if I want to and cruise up the hill below 1100 degrees. You did not mention the RPM's but you want to stay in the power band. 17-2600

Do a search on pre-turbo temps and and you will find a wealth of info.

Best of Luck and happy reading... . R C

 

[jnelson]

Sounds kinda bass ackwards to slow down before hitting a grade. I did slow down while climbing the grade and down shifted to try to drop the temp. that didnt work.



Seems strange my 2001 with injectors and a PE comp box didnt ever get this hot towing the same loads.



I cant be giving up work because my truck cant pull a hill with heavy load without getting extremly high egt's. something aint right.

 

[LEggers]

Its just not right doing what you are doing maybe a turbo with more air or a exhaust system that is free flowing will do it but 1500 all day has got to be asking for trouble.

 

[Snow man]

the 325/600s run HOT, Cummins knows about it,they have premium high strength inconel exhaust valves and high-cobalt stellite exhaust valve seats for durability and long engine life. I am by no means saying 1650 sustained is all good,but the new engine is capable of taking a lot more heat than our 2nd gen 24v or 12Vs ever could. Whats amazing is that the truck held 68MPH with 27000 GCWR. IF the EGT's were a problem,i think Cummins would have reduced the Hp rating or improved airflow to reduce them. Id like to see a solid number from Cummins as to what is the actual safe sustained limit on the "600".

 

[robertyoke]

are you sure that your box was not on? or do you have injectors??

the hill at Virginia Dale is 7% grade for close to 1 mile. my 04 stock 305/555 has to grab 4 gear at 25k gcw to top that hill.

as for temps your at about 7000+ ft. at that point no air = high egts

both my trucks when stock would see 1350* but thats it. they are 305/555..... but 1650* :--) for the 600.

 

[bgilbert]

Pre or Post Turbo?? Cummins says 1250* preturbo all day. The engine might be made to take higher temps better than previous engines but aluminum still melts at a temp less than 1650*. Cummins is still using aluminum pistons aren't they? When if you get towed to the dealer because of nuclear meltdown by all means don't tell them you were grossed out at 27,000 lbs. Don't wanna become your own warranty station.

 

[BStoecker]

And you think that by posting on here your name, your location, your truck specs, and how heavy a load you are towing that DCX isn't already ready to deny your warranty claims if they arise? You have to believe that DCX watches this site just like the rest of us...

 

[Bertram65]

I have found if the EGTs start to climb, if I come out of OD, it lowers the boost and increases RPM, then the EGTs start to come down. Cummins does not provide any info on pre turbo EGT temps, if you contact them they reconmend post turbo and a max of 900 degrees. I would not worry about any warrantee issues by posting here, pretty unlikely DCX would go through the effort.

 

[RonsRig]

Off topic a bit, but...



Have you been tracking your fuel mileage?



I was wondering what effect this event would have on fuel mileage.

 

[Big_Daddy_T]

Those temps sustained would cause a failure or damage. I am suspecting that the egt gauge is inaccurate. 1500 for over 30 seconds should by all means cause irreperable damage.

 

[jnelson]

Gauge is an Isspro and is mounted in the exhaust manifold almost in the center.



While on flat ground pulling the same load egt's ran only around 900-1000* and sometimes lower. Pulling my gn empty (8,300 lbs) I could get it up to 1500* climbing some long grades. I figured letter rip!



As far as weight and posting here - I haul oil field equipment and that weight is not by all means out of the ordinary. There are 100's of trucks here in S. Texas that all do the same thing I do.



I first joined DTR when I bought my first Dodge 3500 in 2000. I have let my subsription expire several times but nobody has ever canceled my warranty.



I did however email Cummins and I am waiting on a reply. If my 2nd generation truck can do it - I know this one can.



later

 

[CoastyAV8R]

I saw some big temps pulling our 5th wheel through the Rockies around Gunnison and the one thing that would keep the EGT temps in my acceptable range (1250) was to slow down. I could go 60 mph up a pass pulling the trailer but, even with a stock motor, the EGT's would skyrocket in the thin air and high passes of Colorado. I just slowed down to 40-55 mph depending on the pass and keep the temps around the 1250 mark. I can't imagine a sustained temp of 1650 can't do some kind of damage, that's incredible. You have to realize that first your over gross by quite a bit, and down in here in Texas you can get away with running the truck hard with that much weight since it's flat. I think it's a different ballgame when you throw mile long 6% grades at an overloaded truck. I'm curious to hear what Cummins says...

 

[Marco]

All the diesel engineering books I own. Every engine engineer I've ever spoken to. All say that the highest EGT for an all cast iron diesel engine should not exceed 900 degrees Celsius. That's 1652° Farenheit...



Almost everybody in the States talks about 1250-1350° F...



Now who's correct?



My truck has been over 1600° many times, sometimes for long periods.

No harm...



Marco

 

[zues]

I am really confused on temps... You hear all kinds of temps to stay under, but the 325/600 will go above those temps all the time even empty. I had a 12 valve that would never go over 1250 and my new truck goes over that empty and stock. The highest temp I have seen has been 1450 pulling my 5er at 6000 feet.

 

[MMeilicke]

I was curious as to what Cummins says about egt. So I called a Cummins location and asked the questions " What is the max egt for the stock 600 engine". Answer "1100 degress six inches on the exhaust side of the turbo". They continued to say that Cummins does not measure the egt before the turbo; therfore, no recommendations for egt pre turbo. So there is your temp to run at. Just one cummins dealer's thoughts on the subject. So stay at or below 1100.

 

[Bertram65]

That's good info, apparently they upped it 200 degrees from the previous 250/305 HP models.

 

[El Putzo]

So all this talk about putting the thermocouple pre-turbo is wrong according to Cummins?!?! Hmm, very interesting.