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-   -   Heater core/thermostat questions (https://www.miataturbo.net/engine-performance-56/heater-core-thermostat-questions-35554/)

Savington 05-29-2009 03:11 AM

Heater core/thermostat questions
 
I have a spacerless reroute and no heater core on my setup. With the stock Miata setup, you can't run without a thermostat because the water never gets to the back of the motor. With a reroute, this issue goes away.

The problem I have is that too much water gets through the heater core feed, which is just routed straight back to the mixing manifold. It's a contributing cause to high coolant temps for sure. I want to cap it off, but I am worried that with a thermostat, the coolant system pressure will be too high since the only loop with the tstat closed is through the turbo.

If I were to remove the tstat, though, and cap the heater feed/return, then all is well - provided the water doesn't get through the radiator so fast that it never cools at all.

Anyone running a setup that even remotely mirrors one of these who can give me some empirical data to work with?

Thanks guys.

Braineack 05-29-2009 08:59 AM

you could put a restrictor in the hose before the hardline...

Machismo 05-29-2009 09:29 AM

And you could also look into adding a swirl pot at this point.

Joe Perez 05-29-2009 09:50 AM

Quote:

Originally Posted by Savington (Post 413124)
provided the water doesn't get through the radiator so fast that it never cools at all.

I don't see that being an issue. Despite the fact that the water will be flowing more rapidly through the system, the percentage of time that any given water molecule spends in any given area will be roughly the same.

Overcooling is the issue I'd be concerned with here.

A restrictor (and keep the thermostat) would be a good solution. Another might be to use the BMW-style bypass thermostat, and eliminate the heater outlet at the back of the head.

levnubhin 05-29-2009 10:32 AM

No heater core here. All I did was drill 3 small holes about 3/16's in the top of the t-stat so that water can still flow through while the t-stat is closed. Has been fine for 4,000+ miles and my water temps never go over 200 while driving.
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Savington 05-29-2009 11:50 AM

Joe, the last thing I am worried about is overcooling. It's going to be 95 degrees tomorrow. ;)


Quote:

Originally Posted by Phillatio (Post 413194)
No heater core here. All I did was drill 3 small holes about 3/16's in the top of the t-stat so that water can still flow through while the t-stat is closed. Has been fine for 4,000+ miles and my water temps never go over 200 while driving.

Perfect. I'm gonna do this and cap off my heater core feed. Thanks, Phil.

levnubhin 05-29-2009 09:42 PM

You bet man.
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Laur3ns 06-21-2009 09:10 AM

Quote:

Originally Posted by Savington (Post 413240)
Perfect. I'm gonna do this and cap off my heater core feed. Thanks, Phil.

How much did this help actually? I am about to plumb the heater core return from the water pump to the radiator inlet to achieve the same.


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