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#3228506 - 12/26/13 05:26 PM Cummins 6BT Thermostat Question
madibob Offline


Registered: 04/24/09
Posts: 119
Loc: Minnesota
I know there are more dedicated websites for this question, but there are a lot of smart folks here. I have the '96 Dodge with the 6BT. I found this fall that when I blocked off part of the radiator, the truck ran warmer and my MPG jumped. My guess is around 2 MPG (I haven't checked it real close yet).

Here's my question - The stock thermostat is 180*F. Cummins never made a hotter thermostat that I could find. From other forums, there is a thermostat for a gas engine that is 195*F that fits. Some of the WVO folks seem to be using these. What are the risks of going to this hotter temperature on this engine? I don't pull much and if I do it isn't very heavy.

Please post if you have any knowledge or experience....not looking for opinions.

Oh, and I should mention the newer 6.7L engines do have a 190*F option.


Edited by madibob (12/26/13 05:28 PM)
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#3228515 - 12/26/13 05:35 PM Re: Cummins 6BT Thermostat Question [Re: madibob]
Chris142 Offline


Registered: 06/05/03
Posts: 14090
Loc: apple valley, ca
Are you sure that it dont have a 195 stat? The one for the gasser is a big block dodge but it wont have the correct bypass restriction
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#3228520 - 12/26/13 05:40 PM Re: Cummins 6BT Thermostat Question [Re: Chris142]
madibob Offline


Registered: 04/24/09
Posts: 119
Loc: Minnesota
Originally Posted By: Chris142
Are you sure that it dont have a 195 stat? The one for the gasser is a big block dodge but it wont have the correct bypass restriction


I read to drill 2 holes in the one for the big block dodge for this. That was my understanding.

BTW - There's also a 200*F thermostat for the 6.7s
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#3228555 - 12/26/13 06:23 PM Re: Cummins 6BT Thermostat Question [Re: madibob]
Ramblejam Offline


Registered: 11/05/13
Posts: 2474
Loc: Kentucky
Gates Part # 33039S -- $4.93 on RockAuto.

Works great for your intended purpose. Just make sure to remove it when warmer temps return.


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#3228562 - 12/26/13 06:34 PM Re: Cummins 6BT Thermostat Question [Re: madibob]
Boczech Offline


Registered: 11/19/05
Posts: 348
Loc: Norcal
Originally Posted By: madibob
Originally Posted By: Chris142
Are you sure that it dont have a 195 stat? The one for the gasser is a big block dodge but it wont have the correct bypass restriction


I read to drill 2 holes in the one for the big block dodge for this. That was my understanding.

BTW - There's also a 200*F thermostat for the 6.7s


Looks like the newer 6.7 engines starting in 2010 call for the 200*F thermostat. http://www.genosgarage.com/Cooling-System/products/219/ I have read some of the 2nd generation 24v folks on another forum trying the 200*F thermostat's in their truck with a slight gain in fuel mileage.


Cheers
B
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#3228616 - 12/26/13 07:27 PM Re: Cummins 6BT Thermostat Question [Re: madibob]
bullwinkle Offline


Registered: 10/09/04
Posts: 5832
Loc: Cincinnati, OH, USA
Remember that with an INTERCOOLED turbo diesel, you are introducing cooled intake air into the engine at all times-that's why a winter front on the grill is used in winter. Not sure the thermostat will make a big difference unless you are towing or hauling heavy loads-a lot of people just put something between the intercooler & radiator with a fan clutch sized hole in the middle to restrict airflow.
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