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Lower Temp Thermostat

trizzle

trizzle

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Howdy folks!

As the title says, are there any options for lower temp thermostats? I see they come as a whole housing + thermostat. Would like 190 or below if I could. Thanks!

I will be tuning the fans for the lower temp also.
 
Nick said:
Modern Diesels are designed to run hotter Why would you do that ? Back in the day diesels ran at 180 .
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Considering this is a gas motors, diesel comparison seems null. Lower temps = less detonation, longer oil life, and several other benefits especially when towing. Just curious if there are any option other than the stock 216* thermostat
 
trizzle said:
Considering this is a gas motors, diesel comparison seems null. Lower temps = less detonation, longer oil life, and several other benefits especially when towing. Just curious if there are any option other than the stock 216* thermostat
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Didn’t realize you were talking gas .
 
trizzle said:
Considering this is a gas motors, diesel comparison seems null. Lower temps = less detonation, longer oil life, and several other benefits especially when towing. Just curious if there are any option other than the stock 216* thermostat
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Coolant temp has relatively little impact on combustion chamber temperature. If you’re worried about detonation, more octane is your friend.

Your synthetic engine oil is tested at 300 degrees, and sees temps much higher than that in the rod & crank bearings. It is right at home in the heat.
 
You also want to get the oil up to operating temp as fast as possible and keep it there for a while to burn off/disapate any water/condensation there may be in the oil
 
As mentioned, these engines are designed to run hotter than old engines were. They can do that because the oil is much better and the manufacturing tolerances are much better.

They run hot to increase efficiency and reduce emissions.

If you’re really curious about the physics read about Carnot’s Law.
 
As others have said don’t worry about the “high” temps. The whole system was designed for it. Ample quantity, flow and heat exchanging surface area coupled with 21 PSI keeping the boiling point high makes for a very efficient and more than sufficient cooling system.

The Hemi may have a couple somewhat inherent problems - the cooling system has never been one of them.

Go changing one aspect of a powertrains design and be prepared to reengineer the whole thing.
 
Folks, ive been working and wrenching on cars since I was crapping my diaper. I understand how heat impacts an engine. Coolant temp has a direct correlation with oil temps in these engines. 220F is on the warmer side of where id like to be. I appreciate the information you guys are pushing but id just like to know if there are any lower temp thermostat options that I haven't been able to find yet. Lower temps = less thermal stress on every component of the motor.
 
I've been wrenching for over 50 years myself.
In the old days, yea, you wanted to run a 170 or 180 T stat.
But with modern synthetic oils, coolants, better materials, it's no longer needed.

But a quick Google search pulled up a bunch.
Mishimoto has them.
 
Crusty old shellback said:
I've been wrenching for over 50 years myself.
In the old days, yea, you wanted to run a 170 or 180 T stat.
But with modern synthetic oils, coolants, better materials, it's no longer needed.

But a quick Google search pulled up a bunch.
Mishimoto has them.
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Only thing I can find is for an actual thermostat or housing is for the newer 1500s not for a 2500 gasser.
Ive run a 180 thermostat in every single hemi ive had and they've all performed better with it vs stock when tuned for the lower thermostat. Wish they had something to delete the EGR on the gasses too. Took the throttle body off this truck and the backside was caked with crap.
 
Crusty old shellback said:
I've been wrenching for over 50 years myself.
In the old days, yea, you wanted to run a 170 or 180 T stat.
But with modern synthetic oils, coolants, better materials, it's no longer needed.

But a quick Google search pulled up a bunch.
Mishimoto has them.
Click to expand...
The aftermarket is never shy about cooking up a solution to a problem that doesn’t exist.

It’s clearly a good business model.
 
Trash Panda said:
The aftermarket is never shy about cooking up a solution to a problem that doesn’t exist.

It’s clearly a good business model.
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Its not a problem and I never said it was. I just prefer to not see 220f coolant and oil temps.
 
trizzle said:
Folks, ive been working and wrenching on cars since I was crapping my diaper. I understand how heat impacts an engine. Coolant temp has a direct correlation with oil temps in these engines. 220F is on the warmer side of where id like to be. I appreciate the information you guys are pushing but id just like to know if there are any lower temp thermostat options that I haven't been able to find yet. Lower temps = less thermal stress on every component of the motor.
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Just because you’ve been doing it a long time doesn’t mean you know what you’re talking about
 
Rockcrawlindude said:
Just because you’ve been doing it a long time doesn’t mean you know what you’re talking about
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Id like to think i know a thing or two about hemis since ive been building and racing them specifically for quite a while. If you dont have anything to add other than attempted jabs, keep it moving. Not here to bicker, just looking for information on parts.
 
I’m thinking there is NOT a different thermostat for the 6.4 hemi.

It has a heating element built into it and it is different than other Hemi thermostats like in the 5.7 in 1/2 tons.

Here’s a link to when I changed my thermostat to to it not closing and thus it was running too cool.
D

Thread '6.4 HEMI Thermostat R&R 2020 Ram 2500'

My thermostat was setting off a service engine code for an irrational thermostat, so I swapped it out.

The radiator drain is a yellow wing nut and 5/16” hose fits on the drain. I drained just less than 2 gallons from the radiator and it kept me from spilling much when the thermostat was removed.

I undid my air filter box lid and held it up with a tarp strap.

There are two bolts (13mm socket) and I used a couple long extension the one with the socket was a wobble extension. I left the hose attached to pull the thermostat off. There is a marked link on hose that lines up with the tab on...
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Here’s a cutaway view of my old thermostat. When 12 volts is applied to it it gets hot quickly.
 

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Hmm. Unfortunately it almost looks like an actuator? Probably not any alternative if there's a heating element in there.
 
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