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Discussion Starter #1
anyone have a head sitting on a shelf or bench that can help out with 2 measurements?

1) straight edge across the thermostat hole, measure the depth to the bottom of the casting

2) straight edge across the thermostat housing, measure the depth to the top of the t-stat housing.


I am trying to find out how big of a t-stat will fit in the head without modification. I dont want to wait until the next time i drain my coolant to measure mine.

Any help is greatly appreciated...TIA
 

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I have one in the driveway right now with the thermostat housing off. Measurements 4th coming.
 

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Measurements are #1 1.44" to the shelf that is machined and has a secondary passage in the head #2 is 2.2" in the middle of the t-stat housing, it does neck down on the sides, but that is taken from directly in the middle.

Send me a message if more is needed, this will be going back together in a week. Might be best for me to send pictures of what I'm measuring. Or video chat somehow.
 

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Discussion Starter #4
Measurements are #1 1.44" to the shelf that is machined and has a secondary passage in the head #2 is 2.2" in the middle of the t-stat housing, it does neck down on the sides, but that is taken from directly in the middle.

Send me a message if more is needed, this will be going back together in a week. Might be best for me to send pictures of what I'm measuring. Or video chat somehow.
Nope, that is perfect!!!

Thanks for the quick response... looking for potential options for flow relating to using the electric water pump (larger t-stat openings for increased flow)
 

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Discussion Starter #5
2nd thought comes to mind...

Is it possible to take a pic of the t-stat hole in the head that shows the 2nd passage?
 

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Discussion Starter #6

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Even for the guys running standard water pumps a larger thermostat has potential to help lower the high block pressures associated with high rpms.
 

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Discussion Starter #8
Even for the guys running standard water pumps a larger thermostat has potential to help lower the high block pressures associated with high rpms.
Agreed, the one thing to check out is how long the coolant is in the radiator and if the oversized diaphragm will affect it negatively. I found one that I think will work, just not home to do anything about it... (next week)
 

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did you ever figure out a different thermostat? I ended up and got a Cummins brand 200 deg thermostat. It defiantly has a lot bigger let through than the stock 190 deg. I was going to take a photo when I installed, but didn't have my phone.
 

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Discussion Starter #10
no, have not gon any farther than looking up parts on the gates website. a bigger diaphram diameter is what i am after.i have both a 190* stat & 200* stat and will measure the diaphrams. i think they are both the same. one thing to add, when i first drilled the bleed hole i did a 1/8", took way too long to get up to temp... cant say how it did cooling wise (winter)
 

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A 1/8 will be too cold in winter, been there before and our winters are mild.

If looking to increase flow when hot it may pay to look at setting up dual thermostats with the second one about 3/4 of the opening to full open range of the first thermostat
That would keep warm up etc standard and just come on when needed.

Cheers Steve
 

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Discussion Starter #12
Thought of duals... the 4th gen return line has a 2nd return line that could be used to add flow, but from where would be the next question.
 

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Discussion Starter #13
did you ever figure out a different thermostat? I ended up and got a Cummins brand 200 deg thermostat. It defiantly has a lot bigger let through than the stock 190 deg. I was going to take a photo when I installed, but didn't have my phone.
from pm comments...

took a look at the 2 stats i have and yes they have different diaphram sizes. adding a pic here shortly...

the 190* stat has a smaller diaphram than the 200* stat...







 

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Discussion Starter #15
Interesting observation... the pic below is for a marine application and has a blockoff plate for the bypass port. <deleted found answer>


 

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Edit: Picture showing now that it refreshed.

Picture not showing for me.


PN for Cummins 200* stat?


Sent from my iPhone using Tapatalk
 

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The Cummins part# 5292724 for 200 Deg thermostat, I got mine from PDP. I installed it on my 07 5.9, it fit just fine. It took a lot longer getting the coolant back in than it did to install!
 

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Any leads on a 190 that is larger like the 200? I might just switch to the 200 if I can't find a 190 that is bigger. When I'm towing heavy my coolant temps are typically 210-220 anyway.
 

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Discussion Starter #20
Any leads on a 190 that is larger like the 200? I might just switch to the 200 if I can't find a 190 that is bigger. When I'm towing heavy my coolant temps are typically 210-220 anyway.
Yeah but I need to go get one in hand, the blockoff port is the concern. My next step was to go bug the guys at the local Napa to look at their stant catalog to see if they have specs. What I found was a gates stat (no p/n handy atm)

Have you run a 180* stat with those loads? If so what was the effect on CTs?
 
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