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  #81  
Old 03-30-2014, 08:59 AM
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Around here there was only a listing for a 180* at the three parts stores I checked at. I just might try a 440 stat.
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  #82  
Old 04-01-2014, 09:35 AM
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I dug around the net and found the same answer as well. Oh well. But the cycling coolant temps has been a issue for 12V for a very long time.
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2002 Dodge Ram 2500, 5.9L Cummins Turbo Diesel, 5 Speed NV4500 transmission, 4x4, 3.55 Gears, AirDog 150 fuel pump with 1/2" Big Line Kit, Stock Bosch VP44 Injection Pump, Bosch RV275 Injectors +40HP, Edge Comp Performance Box, BHAF (Big Honkin' Air Filter), Stock Holset HX35W Turbo, Straight 3" Pipe Exhaust, Crankcase Vent Mod, High Idle Mod, MPG / IAT fooler Mod, ScanGauge II, 25% Tinted Windows, DiPricol Gauges (Fuel pressure, Boost, Pyrometer), 235/85 R16 tires mounted on 16x7 Aluminum mags (weighing 62#), Custom Fog Lights, Custom Backup lights, Silverstar Headlights, 23-24 MPG

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  #83  
Old 04-01-2014, 09:41 AM
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Quote:
Originally Posted by Mopar1973Man View Post
I dug around the net and found the same answer as well. Oh well. But the cycling coolant temps has been a issue for 12V for a very long time.
Thats interesting..... So does that point towards thermostat quality?
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  #84  
Old 04-01-2014, 07:10 PM
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Thats interesting..... So does that point towards thermostat quality?
I don't believe it does. Even a Cummins stat cycles. I believe that the water pump is moving so much water that by the time the thermostat has a chance to react to the cooler water flowing from the block (radiator is so large the volume of water is cooled to ambient is probably about 1/2 the system capacity) that it has no choice but to close to try to keep the block warm. From what I have seen the 24V engines have a built in bypass to keep some of the heated water in the block. I am not sure about the VE pump engines. They didn't seem to have the cycling problem, did they?
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  #85  
Old 04-01-2014, 07:15 PM
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I was under the impression that the fluctuating engine temp issue was mainly a 24 valve thing.....
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  #86  
Old 04-02-2014, 08:40 AM
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Maybe it is both? I don't have much experience with the 24v trucks. To me it seems like the volume of water moved by the water pump is just too great.
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  #87  
Old 04-05-2014, 08:58 PM
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Strange I don't have the wild up / down swings. I've been running the NAPA thermostats and issues. I've only seen one thermostat fail premature. Truck is now 12 years old.
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2002 Dodge Ram 2500, 5.9L Cummins Turbo Diesel, 5 Speed NV4500 transmission, 4x4, 3.55 Gears, AirDog 150 fuel pump with 1/2" Big Line Kit, Stock Bosch VP44 Injection Pump, Bosch RV275 Injectors +40HP, Edge Comp Performance Box, BHAF (Big Honkin' Air Filter), Stock Holset HX35W Turbo, Straight 3" Pipe Exhaust, Crankcase Vent Mod, High Idle Mod, MPG / IAT fooler Mod, ScanGauge II, 25% Tinted Windows, DiPricol Gauges (Fuel pressure, Boost, Pyrometer), 235/85 R16 tires mounted on 16x7 Aluminum mags (weighing 62#), Custom Fog Lights, Custom Backup lights, Silverstar Headlights, 23-24 MPG

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  #88  
Old 02-12-2015, 11:01 AM
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I have been following this thread and would like to know about the 24v thermostat. As far as I know my thermostat is oem 180* and my Cummins has no issues with the oem thermostat. I have read posts I believe on Mopar 1973 Man's site that you will get better fuel mileage with the i90* thermostat because Diesel fuel burns better/cleaner with the 190*. I checked with Cummins and they agreed and have a Cummins 190* thermostat available for the 24v. If the 190* produces better mileage, that's what I want. I do have a concern about the water temp sending unit relaying information to the computer or whatever it does which might effect a change to the fuel flow or timing. The last thing I want is to solve one problem by creating another. What do you say?
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  #89  
Old 02-12-2015, 11:24 AM
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To the best of my knowledge running a 190* stat vs. a 180* stat won't have any effect on the computer seeing the higher temperature. These engines love heat and will run better at a higher temperature. That is one of the reasons the new trucks are running closer to 200*.
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  #90  
Old 02-12-2015, 11:51 AM
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The OEM thermostat for the 24 valve was 190*. 10* hotter than the 12 valve. And this is because the 24v flow considerably more air than the 12v so therefor its more difficult to maintain proper cylinder head temperatures at low load conditions. This is where most of the controversy came from about idling the 24v for long periods of time. Disclaimer: I think some 1998.5 24v trucks came with the cooler 180* thermostat until they found the 190* worked better.

And in regards to fuel efficiency, yes diesels run more efficient when the cylinder temps are higher simply because the only source of heat for combustion is whats generated from compression and combustion.

There's a few guys who've tried a 200* thermostat but if I remember correctly it was good in the winter but too hot in the summer if you ever tried to hook up to a trailer. Because the cooling system is pretty good on these trucks but when adding a 10* disadvantage for dissipation then you allow more room for hotter running temps while towing.
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