[Fot] TR coolant pressure/flow

[Tony Drews]

You should see in the neighborhood of 30 psi on the engine side of 
the t-stat housing and in the vicinity of the radiator cap's pressure 
relief value on the upper radiator hose, probably around 10 psi.

Tony Drews

At 09:08 PM 2/7/2013, Greg & Alison Blake wrote:
>FOT
>
>
>
>Anyone out there every gauged coolant pressure on the TR block?  I'd love to
>see the results.
>
>
>
>I am going through the process of adding a surge (expansion) tank on my TR3
>and I am starting to wonder if I am plumbing the return line in the correct
>spot.  I have installed the tank in the battery box with a line entering the
>top of the tank that originates at the heater port in the rear of the head.
>For the return line, off the bottom of the expansion tank, I have added a
>welded fitting in my top radiator hose between the thermostat housing and
>the radiator to accept the return line.  I use a cross flow Chevy style
>radiator so I have a metal radiator pipe between the thermostat housing and
>the intake for the radiator.  I thought it would be better to introduce the
>hot coolant from the expansion tank back into the radiator vs dumping
>directly back into suction side of the water pump via the return heater
>port.  My thinking was that I should not introduce hot coolant into the
>suction side of the pump and re circulate it back thru the block.  The way I
>have it plumbed (if it works), the hot coolant from the expansion tank will
>first go thru the radiator then into the pump and back thru the block.  I am
>guessing that downstream of the thermostat housing (I use a thermostat) the
>pressure will be lower than at the back of the block.
>
>
>
>My questions are:
>
>Has anyone measured pressure between the thermostat housing and the
>radiator?
>
>Has anyone measured pressure at the back of the head heater port?
>
>What is the difference?
>
>Am I going to get coolant to flow from my expansion tank back into the top
>radiator hose or is the pressure higher in that top hose than the back of
>the block?
>
>Would it be better to plumb the return line into the return heater port?
>
>
>
>Thanks,
>
>
>
>Greg
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