1st Generation Dodge Cummins 89-93 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with Rotary Injection Pumps

Cool Down?

Old Dec 28, 2009 | 09:07 PM
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Default Cool Down?

hey all,

when i put my truck in park and wait for the egt's to go down ,they hardly don't. Tonight i waited for about 5-6 minutes for it to get below 400*. is there anyway to these down faster, especially since it's colder i'd think they would go down faster.

thanks for the help.
 
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Old Dec 28, 2009 | 09:16 PM
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I dont go by temps, if I was driving no load then I just give it one minute...............when I tow I do a few minutes
 
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Old Dec 28, 2009 | 09:27 PM
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What whit said. Whats your Idle RPM? When mine was up above 800rpm it would never cool down below 400 or so.
 
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Old Dec 28, 2009 | 09:29 PM
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its at about 800-850
 
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Old Dec 28, 2009 | 09:32 PM
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Where is your temp probe located? Pre turbo you get much faster temp changes than post turbo from what I've noticed. Biggest thing is just givin the turbo time to spool down
 
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Old Dec 28, 2009 | 09:55 PM
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Originally Posted by DieselPerformanceGuy
its at about 800-850
isnt that pretty high for an idle?

mine idles at 6-650 and mine idles right around 400 degrees
 
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Old Dec 28, 2009 | 10:08 PM
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i dont even have gauges yet and i always let it idle 1 to 2 mins just a good habit to get into especially stock and high mileage engines almost 300 k still stock
 
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Old Dec 29, 2009 | 12:26 AM
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Originally Posted by tltruckparts
isnt that pretty high for an idle?

mine idles at 6-650 and mine idles right around 400 degrees
no i'm pretty sure 750-800 rpms are stock, but don't hold me to it. Plus my torque convertor is ****, when i put it in gear, the tach goes from about 800 down to like 550, 600 degrees.

---AutoMerged DoublePost---

Originally Posted by jasonfriedlin
Where is your temp probe located? Pre turbo you get much faster temp changes than post turbo from what I've noticed. Biggest thing is just givin the turbo time to spool down
its mounted pre turbo, and yea it's not just about letting spool down, its about letting the oil circulate through the journal bearings too.
 

Last edited by DieselPerformanceGuy; Dec 29, 2009 at 12:26 AM. Reason: Automerged Doublepost
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Old Dec 29, 2009 | 09:48 AM
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Originally Posted by DieselPerformanceGuy
no i'm pretty sure 750-800 rpms are stock, but don't hold me to it. Plus my torque convertor is ****, when i put it in gear, the tach goes from about 800 down to like 550, 600 degrees.

---AutoMerged DoublePost---



its mounted pre turbo, and yea it's not just about letting spool down, its about letting the oil circulate through the journal bearings too.
The oil is circulating as long as the engine is running, but if you shut it down with the turbo still spinning 10,000 rpms the oil isnt circulating anymore and thats what causes the problems with the turbos
 
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Old Dec 29, 2009 | 12:30 PM
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o ok so its both letting it spool down and get oil circulation.
 
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