Heater core/thermostat questions
#1
Thread Starter
Former Vendor
iTrader: (31)
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Posts: 15,442
Total Cats: 2,104
From: Sunnyvale, CA
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.
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.
#4
Boost Pope
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Joined: Sep 2005
Posts: 33,516
Total Cats: 6,913
From: Chicago. (The less-murder part.)
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.
#5
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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