so i installed an autometer egt in my 07 with 5.9 auto. pulling my toyhauler 13000# loaded, i see temps in 1200 range on steep grades. keep backin out and it drops to 1100, bit really boring to pull hills at55 when last year, without gauge i pulled them at 65+, easily!!! occasionally bumped into 1300 a time or two. how long can you sustain 1200+ temps without damaging motor or turbo? probe is located preturbo between# 3 and 4 pistons. on flat ground 7 or 800 max temps. dont wanna do exhaust , turbo or injectors while under warranty, so,,,,,,,,

 

I'm no expert, but I think you shouldn't run 1300 degrees for more than a few seconds at a time. I think I read somewhere that 1200 is okay, but 1300 is not okay. I'm sure someone who really knows will chime in soon.

 

I start thinking about backing off at 1300 and try to never go over 1350. My quadzilla alarm is set at 1350. I saw 1405 once, and imediately backed off.

 

water/meth injection any one?

 

always heard 1300 is the magic number for diesels

 

Ok lets make it really clear and simple...

What is the pistons in a Cummins made out of?
ALUMINUM

What is the melting point of aluminum?
1220.58*F

I relize there is oil cooling jets cooling the underside of the piston. But for all safety sake I wouldn't cross the 1,200*F mark for very long. This just insures that you not going to do any damage to you expensive engine!

 

3rd gens can run a bit warmer than previous generations due to the valve seats in the head, different valves(metal makeup) and also that the pistons themselves are made of a metal alloy that can handle higher temps.

the HPCR's can run all day 1200F, it can run 1300-1350F for a while, but that is beging to push things. over 14-1500 is a good time to back out. you can run as high as 1600 for VERY short bursts.

 

Wow! That just plum crazy temps...

But temps that high are screaming bigger turbo or twins... And maybe the next larger exhaust pipe...

I got to admit I hit the 1,3000-1,400*F a few time but for a very short period... Like 15 seconds tops...

 

I'll agree with Drew, we can run our trucks at 1200-1300*F sustained, all day long for miles and miles without damage. Running over 1300*dammage accummulates. Usually the trubo is the first to see damage, its squared off thin outter edge part of the turbo fis will begine to melt, this cuases the turbo to be out of balance which then takes out the bearings. Excessive EGTS can also cuase to turbo to overspeed causing the housing to crack or blow apart. If the trubo doesn't blow then you'l start melting the pistons!

Excessive EGTS are in part caused by too much fuel. If your using a programmer, I would check with the manufacturer, see if they will "defuel" at preset or programmed EGT setpoints! You can also upgrade your turbo to reduce EGTs.

If you have an EGTgauge and you see high EGTs get off the "go pedal" or down shift, this will quickly reduce those temps.

 

I've got my probe after the turbo. What is the magic number there?