Dodge Cummins Diesel Forum banner
  • Hey everyone! Enter your ride HERE to be a part of September's Cummins of the Month Challenge!
1 - 20 of 32 Posts

·
Registered
Joined
·
701 Posts
Discussion Starter · #1 · (Edited)
1# what are you guys running down the freeway with 10 or so psi of boost? (egts)? #2 and what would you consider the highest temp you can run sustainable without failure?
 

·
Registered
Joined
·
7 Posts
Unloaded, on the straight and level, I see a tad over 600*. Second, I don't like to see over 1100* F sustained, with peaks at 1250-1300. But, I get antsy even when I see north of 1000*F, so those are probably the cautious numbers.
 

·
Registered
Joined
·
576 Posts
you can sustain 1200 for a few minutes to go up a big hill or something like that and not worry! at 75, or 80 it'll be around 10lbs of boost, 700-900*, usually i cruise at 65 w/ 5-6lbs of boost 600-800*

also if im crusing and floor it in 5th it'll get up to 1400* by 120mph
 

·
Registered
Joined
·
793 Posts
i think cummins claims your safe up to 1300 or 1350. i see about 850 cruising at about 70 mph. i can hit 1600 with the edge turned up.
 

·
Registered
Joined
·
701 Posts
Discussion Starter · #5 ·
i think cummins claims your safe up to 1300 or 1350. i see about 850 cruising at about 70 mph. i can hit 1600 with the edge turned up.
My understanding and correct me if im wrong but the 24V can take a little higher temp?
 

·
Registered
Joined
·
793 Posts
im not sure about the 24 valve taking more. i seen one melt a piston at around 1500.
 

·
Tech Specialist
Joined
·
2,034 Posts
aluminum melts at 1200-1250* so stay below that in any engine. I belive cummins rates them @ 1200 maintainable.

@65 cruising I'm at about 600* but in three seconds I can be at 1600*
 

·
Registered
Joined
·
225 Posts
I think the air line going to my gauge is kinked because its really slow to react, but I average somewhere around 5-10 psi at 70 and somewhere around 800deg.
I've had my last truck somewhere in the 2000 deg range before though for about a second with no ill effects.
I could be wrong, but I thought Cummins was rated somewhere around 1200deg constant.
-R.J.
 

·
Premium Member
Joined
·
16,203 Posts
Another thing to consider is how much do you trust your pyro?
I know a fellow who melted down some pistons on sustained heavy travel trailer pull at 1200°, turned out his gauge gradually read up to 150° low at temps over 1000°. At no towing cruising and idle his temps read normal.
Since then I draw the line at 1000° sustained.
 

·
Cummins Fanatic
Joined
·
875 Posts
Highest I EVER see is 1000, and thats with a 11,000 lb load on. I don't worry. Usually cruising its around 550-650.
 

·
Registered
Joined
·
701 Posts
Discussion Starter · #11 ·
Another thing to consider is how much do you trust your pyro?
I know a fellow who melted down some pistons on sustained heavy travel trailer pull at 1200°, turned out his gauge gradually read up to 150° low at temps over 1000°. At no towing cruising and idle his temps read normal.
Since then I draw the line at 1000° sustained.
THATS kinda what ive been thinkin is my pyro
is either "off" or i need to look around some more for a boost leak...i got the cheap glowshift gauges.
 

·
Registered
Joined
·
104 Posts
My trucks run 300 to 350 unless i really let in to it it goin up a hill and then thegts jump up to about 650 and then creap down again. my trucks is bone stuck except for 4 inch exhaust that was just installed today so egts should go down even more.
 

·
Registered
Joined
·
576 Posts
My trucks run 300 to 350 unless i really let in to it it goin up a hill and then thegts jump up to about 650 and then creap down again. my trucks is bone stuck except for 4 inch exhaust that was just installed today so egts should go down even more.
defiantly sounds like a post turbo probe to me...
thats how my truck was before i put the pyro pre turbo. I would recommend doing so also, it is 100 times faster to react and is much more accurate. (plus you are worried about pistons melting... so the closer the better)
 

·
Registered
Joined
·
56 Posts
I recently emailed both Dodge and Cummins to ask what my ISB 325 engine could run for EGT's and could I change turbos to drop temps. Cummins told me all warrantee claims were up to Dodge and gave no specifics on maximum temps. Dodge had little info on the newer engine but sent me this link for resource. See what you think but I wont run over 1250* for more that a few seconds...Jeff

Turbocharger FAQ
 

·
Registered
Joined
·
215 Posts
aluminum melts at 1200-1250* so stay below that in any engine. I belive cummins rates them @ 1200 maintainable.

@65 cruising I'm at about 600* but in three seconds I can be at 1600*
That is correct 1200 all day long :thumbsup

A standard cruising unloaded temp for me is 500 to 600 at 65 MPH...less than 5lbs of boost

.
 

·
Registered
Joined
·
215 Posts
My trucks run 300 to 350 unless i really let in to it it goin up a hill and then thegts jump up to about 650 and then creap down again. my trucks is bone stuck except for 4 inch exhaust that was just installed today so egts should go down even more.
Post turbo reading ?


.
 

·
Registered
Joined
·
165 Posts
If I am just cruising , flat ground , boost 4-5 psi.
55 MPH 500 *F
65 600
75 700
 

·
Rockin' the Hoodstack
Joined
·
560 Posts
If am running 75mph I stay right at 10-12 psi and 800*
 

·
Registered
Joined
·
104 Posts
1 thing to remember bout pyrometer prove location mount i n the exhaust manifold risk the proke breaking off and going through the turbo or mount it on the down pipe and play it safe. Look at all big rigs on the road today look at where they monitor EGt from they're all mounted after the turbo. These probs are well known to fail and break off diesel soot is very corrosive and will eat your probe.
 

·
Registered
Joined
·
215 Posts
1 thing to remember bout pyrometer prove location mount i n the exhaust manifold risk the proke breaking off and going through the turbo or mount it on the down pipe and play it safe. Look at all big rigs on the road today look at where they monitor EGt from they're all mounted after the turbo. These probs are well known to fail and break off diesel soot is very corrosive and will eat your probe.
Really? thats new to me.....

:popcorn:
 
1 - 20 of 32 Posts
Top