High egt's ?

[2 Ram Fam]

I finally got my westach combo gauge installed this last sunday. After driving around since then I am surprised how high the egt's are at 60, about 1,000. During average take off (staying with traffic) it also hits 1,000. Under hard acceleration it goes to 1,200 but no higher even with a 0 to 80 test. While in regen. it stays at 1,200,usually only about 10 minutes. In park it will get down to 350 pretty quick. All these numbers are with out any load. Dose any one else think these sound normal? They seems very high compare to my old 2004. 5.

 

[jtwcummins]

Welcome to the world of emission control. I can't get much over 1200* coming up I80 from Sac with my 5ver though. I was surprised how high the EGT was on the hiway unloaded. It's normal, takes heat to burn what needs to be burned. 08 runs alot higher than my 97 did.

 

[1Nebel0]

Your numbers are right on with my 2007 3500 duallie... . 14,850 miles. . Running the Edge Insight... Love it... .

 

[Hoefler]

Wait till you see what a 6. 7 does. I have seen 1450 while in regen and under a load at 70 mph.

 

[HBarlow]

Your temps are normal. Producing horsepower and torque requires more fuel and generates more heat than OEM 12 valves.

 

[2 Ram Fam]

Thanks for the info. I guess I'll keep it. For a while I considered a new 400hp hemi, about the same fuel mileage,smooth ride,& life time warranty. There was no comparison in towing.

 

[Bob4x4]

Your temps are normal. Producing horsepower and torque requires more fuel and generates more heat than OEM 12 valves.

The temps are normal for the 6. 7 but your reasoning is off The crd head flows way better than the 12v and can produce more hp at less temps than the 12v head will.

 

[HBarlow]

Bob,

Unless the laws of physics have been recently rewritten I'm going to stick with my statement. Better flow is not going to provide greater power without burning more fuel.

Perhaps you are confusing the principles of gasoline engines with diesel? A gas engine makes greater power with better flow. A diesel increases power by burning more fuel.

 

[Lil' Dog]

Mechanical injection compared to Mulitple injection electronic systems will throw a wrench into conventional theory on combustion.

To get the same Hp with mechanical one time injection takes allot of pressure/heat all at once. The CR engine can provide similar power by keeping the pressure in the cylinder longer with prolonged combustion. Hense the 3rd injection pulse for increased torque. Lower pressure= lower heat... Same BTU's burned, just at lower pressure.

 

[Bob4x4]

Bob,



Unless the laws of physics have been recently rewritten I'm going to stick with my statement. Better flow is not going to provide greater power without burning more fuel.



Perhaps you are confusing the principles of gasoline engines with diesel? A gas engine makes greater power with better flow. A diesel increases power by burning more fuel.

I don't recall any argument over fuel economy??

Trust me on this. A CRD can make great power and run low egt's. Yes it may burn some fuel but with the incresed air(oxygen) available and optimized timing it is a good combination. Both my 12v and CRD have similiar power,both have optimized flow improvements but the CRD is much easier to tow hard with the pyro staying with-in range.

 

[HBarlow]

I don't recall any argument over fuel economy??
Trust me on this. A CRD can make great power and run low egt's. Yes it may burn some fuel but with the incresed air(oxygen) available and optimized timing it is a good combination. Both my 12v and CRD have similiar power,both have optimized flow improvements but the CRD is much easier to tow hard with the pyro staying with-in range.

Huhhh? Who was talking about fuel economy?

I previously posted this comment about the OP's EGTs: "Your temps are normal. Producing horsepower and torque requires more fuel and generates more heat than OEM 12 valves. "

You posted this criticism of my post: "The temps are normal for the 6. 7 but your reasoning is off The crd head flows way better than the 12v and can produce more hp at less temps than the 12v head will. "

I responded: "Unless the laws of physics have been recently rewritten I'm going to stick with my statement. Better flow is not going to provide greater power without burning more fuel. "

And this: "Perhaps you are confusing the principles of gasoline engines with diesel? A gas engine makes greater power with better flow. A diesel increases power by burning more fuel. "

You are talking about modified engines. The OP and I were not.

Cummins engineers must disagree with you as I do. Cummins built the later HPCR engines with valves, valve seats, pistons, and top rings designed and tested to run at sustained EGTs of 1450*. They did not build the earlier engines to withstand those temps. I have a copy of an old e-mail sent to me by a Cummins engineer in response to a question I sent him. He reported that the 2004. 5 HPCR engine was highway tested with full instrumention at EGT as high as 1450*.

 

[Bob4x4]

:-laf There may be 3 or 4 stock trucks left on this forum

 

[CurtLee]

:-laf There may be 3 or 4 stock trucks left on this forum

Bob define "stock":-laf

 

[hsmith]

Almost nearly stock. NOT!!!