maximum egt for 2004.5- 2007 5.9

[Gerry R]

I was surprised that I couldn't find any comment on this. My probe is located between #5 and 6 cylinder. Up till now I've always used 1250* for when to ease off because that's what I used on my old 2001 24v, but wondered if newer 3rd generations are different. Does anyone have any information on what Cummins thinks?

[Wild and Free]

The 3rd gens can handle hotter temps. I have talked to guys who tow heavy with some mods on the 3rd gens and never see anything below 1200 all day long and not have any issues. I only have a Smarty JR on my 05 and have never seen the need to add gauges although I have thought about adding fuel supply and rail pressure gauges just for fun.When I had my 02 modded to 560 hp I would routinely see 1200-1300 the whole time I towed on hot days and never had an issue.I usually ran with the Edge comp box on level one and at that setting I was at around 475 hp.

[jlwelding]

I have been told 1350 is nothing to worry about. My 05 runs just under 800 at hwy speed. The funny thing is the more weight I add it really dont get that much hotter, but you got to watch the hills it will run up on you quick.

[AH64ID]

3rd gen's can't handle any more heat than a 2nd gen, infact the 04.5-07 piston is the easiest piston to melt of any ISB ever put in a Dodge. The cylinder temp is what we want to keep under control, on a 3rd gen the timing is VERY retarded and that puts the heat into the exhaust and the piston sees much less heat. So a 05 at 1400° will have lower cylinder temps than a 01 at 1200°. If you use 1250° as a peak on a stock 04.5-07 you are leaving a lot of power on the table. So on a STOCK 04.5-07 1450° is fine pulling grades, and some will hit 1500° which is fine for shot periods. If you have any timing then that number is reduced. A Smarty Jr on TM2 should limit sustained EGT's to 1250° and momentary peaks to 1300° when towing. When going WOT down the street I don't think the Jr will get hot enough to do damage. So.. sorry, but a 3rd gen doesn't have a blanket answer on safe EGT's but those numbers should help.

[jlwelding]

I have herad it explained several ways but that just made good sence. Thanks AH64ID

[ISX]

A few years ago when I was still green enough to not know how to set my own timing, I took it to a big diesel shop in rolla, MO. They had a CR block there, every piston was melted. They said it was completely stock. How can a stock engine with all of the fancy electronics allow it to melt? I think a stock 12V or even 24V (vp44) barely hit 1000. So what exactly happened to the CR engine that allows it to just melt in stock form?

[Wild and Free]

The fuel doesn't atomize correctly and it more so squirts fuel onto a spot on the piston and melts holes in it. I see this almost monthly on our large mine truck engines.