Bill Greenwood wrote:
The only reason that I can see for having the internal tubing instead of just having the larger hollow chamber might be if they are trying to slow down the flow of steam and compress is so it becomes a stream of liquid again.
Am I right or does anyone know the answer for sure?
In a Mustang the Header Tank it serves a few purposes-
1. It serves as a reservoir. But the coolant level in the header tank is at a lower level than what is contained in the heads and banks. But, the coolant won't drain down out of the head and banks.
2- You don't want the coolant level to drain down when the engine is shut down. The individual tubes are sealed to the outlet of the heads and banks but the open end sits in the liquid pools at the 2 lowest points of the horseshoe. The external outlets that connect to the coolant lines leading away from the tank don't directly connect to the tubes leading up to the connections to the heads. This forms a siphon and keeps the coolant level in the heads from dropping when the engine is shut down.
3- The little tubes exit off of the small scroll chamber where the coolant exits out of the head. This deaerates the coolant and removes bubbles which can cause hot spots inside the heads and banks.
Problems develop from cracks that allow air into and can allow the coolant level then to fall at shutdown.
Rich
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