removing the return radiator hose on the 1930 so i can install the gano filter and start the Thermocure cleaning process.
when i removed the hose there is a brass piece in the top of the hose right before the radiator connection, it is stuffed in the hose. looks like a small brass round cap with 4 holes drilled in it. assume this is a restrictor/orifice plate of sorts used to create pressure in the system before it goes back into the radiator ??
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I would be inclined to think someone put it there in an attempt to slow up the water flow so it would spend more time in the radiator to get cooled more. Just my guess !
The common misconception is that slowing the water flow gives more time for the radiator to cool the coolant. What they don't tell you is that reduced flow in the radiator is also reduced flow in the in the engine block and head(s). So more heat would logically be transferred from the hot metal to the coolant increasing the coolant temperature. Well what really happens is the metal in the engine gets hotter which is not good. It increases the wear and risk of metal damage.
What the restriction really does in addition to slowing the coolant flow is increase the pressure between the water pump and the restriction. The pressure reduces the size of air bubbles in the coolant. The air gets sucked past the shaft on the water pump or loose hose connections. Yes, air can be drawn in when water or coolant will not leak out. That is because the viscosity of air is a fraction of that of the coolant.
