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Old 12-31-2015, 06:02 PM   #1
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Default Improved coolant reroute

I bought an off the shelf M-tuned coolant reroute and did a little custom fab to improve it. The original reroute relies on the 2mm hole in the thermostat to flow warm coolant over it before it opens. This never sat well with me since that's pretty much a static column of water from the back of the motor to the relocated T-stat.

Quickie fab/modification to the M-tuned T-stat housing:





The hot water flows directly over (or against) the T-stat before returning to the heater core as compared to before where the water pretty much bypassed the T-stat entirely and relied on convection/system heat soak to trigger the T-Stat.

Last edited by Jumbosrule; 01-04-2016 at 04:08 PM.
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Old 12-31-2015, 11:10 PM   #2
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Teach me. I don't understand why a static column is bad. If it's not up to temp, then.?
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Old 12-31-2015, 11:40 PM   #3
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The hole is to let air through so you can bleed the cooling system. Convection takes care of opening the thermostat.
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Old 01-01-2016, 12:26 AM   #4
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Ummm, water doesn't enter there in the back of the engine....and its the water pump inlet on the side of the engine.

This will still work, but you have the flow path backwards.
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Old 01-01-2016, 02:43 AM   #5
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I was confused, when comparing my other knowledge.
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Old 01-01-2016, 01:01 PM   #6
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Quote:
Originally Posted by ryansmoneypit View Post
I was confused, when comparing my other knowledge.
He's a little confused too
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Old 01-01-2016, 01:49 PM   #7
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Every time I have a brilliant idea, I do the research to make sure it's not something someone else already considered. 9 out of 10 times, someone has

In this case, I think aidan is right

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Old 01-01-2016, 02:21 PM   #8
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I'm always right.

It will work, but not for the reason you think it will.
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Old 01-01-2016, 02:22 PM   #9
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you probably could have put more holes in the t-stat
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Old 01-01-2016, 02:25 PM   #10
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it will just have to make a 270* turn
still better than the stupid begi "racer re-route"
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Old 01-01-2016, 02:35 PM   #11
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Quote:
Originally Posted by 18psi View Post
it will just have to make a 270* turn
still better than the stupid begi "racer re-route"
Yeah. Heater flow might be compromised.
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Old 01-01-2016, 03:02 PM   #12
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Yeah... The one I worked with, I just drilled a couple more holes in the thermostat. Heater outlet is blocked. No heater core in the car.
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Old 01-01-2016, 03:05 PM   #13
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He is thinking the direction of flow backwards, but the concept is sound and should work well. Hot coolant will travel from the head, through the large hose, then out the small one to the heater. Thus hot coolant (when the engine warms) will cause he TStat to open and send some / most / of the hot coolant to the radiator, while some portion continues through the heater core and on to the mixing manifold.
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Old 01-01-2016, 03:08 PM   #14
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I'd be more worried about loosing flow to the heater core because of the angle.
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Old 01-01-2016, 03:28 PM   #15
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Assuming the hose attached to the welded fitting goes to the heater core (which is what I assume the OP meant by "back of the engine," then this is a good thing. It corrects the one minor design flaw in the M-tuned hardware, and makes it functionally equivalent to the traditional DIY reroute using the spacer and the Kia water neck.
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Old 01-01-2016, 04:25 PM   #16
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every time i read a thread with this same title im never disappointed.
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Old 01-01-2016, 05:03 PM   #17
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Quote:
Originally Posted by aidandj View Post
I'd be more worried about loosing flow to the heater core because of the angle.
Then you must not know how a miata cooling system works. I expected more from you, Mr. know it all.

Thermostats have notches in the sealing flange to prevent a static columb, cook one in a pot of water and you'll see what I mean. I wouldn't even rip the air bleed float pin out and certainly no extra holes, because that's what kills heater core action.
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Old 01-01-2016, 05:14 PM   #18
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and what happens when there is too much flow to the heater core?
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Old 01-01-2016, 05:17 PM   #19
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Quote:
Originally Posted by deezums View Post
Then you must not know how a miata cooling system works. I expected more from you, Mr. know it all.

Thermostats have notches in the sealing flange to prevent a static columb, cook one in a pot of water and you'll see what I mean. I wouldn't even rip the air bleed float pin out and certainly no extra holes, because that's what kills heater core action.
When the thermostat is open. Not close.

No such thing as too much heater flow
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Old 01-01-2016, 05:21 PM   #20
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Oh.

Well, 99.9% of coolant reroutes work just fine with a heater core at right angle because the heater core is low pressure compared to the block, thermostat open or not.
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