Paul,

Thanks for the coolant flow rationale.
Currently the Mazda pump pulls coolant from the rad and pushes it into the
driver's side water passage per the info that you stated.  The coolant comes
out of the block on the passengers' side and goes to the radiator.

Would it be possible to place a stand alone  pump inlet at the outlet of the
block on the passengers's side and push the water through the radiator then
back into the block inlet on the driver's side?  The flow would be the same.
The down side would be that the pump would see the hotest coolant.  Are
there other issues?  Thanks for any help.

Joe Berki
Limo EZ

You might get just steam from time to time.

If you are mounting the remote pump down low that
is the best place. If the water level is down the water input
to the pump will still work.

Paul Lamar



Paul

I believe you mean 'low' as in lower than the water reservoir tank level. Right?  That makes sense.

Joe,  The issues of increasing the flow rate are  mostly related to plumbing restrictions and water density.  Pumping the off gassed  cooler water that is taken from  the bottom of the  vertical reservoir tank after exiting  the heat exchanger will be the coolest and hence most dense water.  Pumping higher density fluid will result in the best flow rate.    Decreasing flow restrictions in the externals will increase flow.


 Pumping into the engine block first (like Mazda designed it) will  subject the heat exchanger to less internal pressure then the vice versa route. Gentle angled  curves entering the inlet and outlet of all devices  will raise flow rate.   One sharp elbow can cut the water flow almost 5%.   Other than cutting the cooling grooves in the rotor housings ala Racing Beat,  we can't do much  to improve flow characteristics of the engine, though I wish the cool water inlet was less turbulent.   A 'once through' heat exchanger will flow much better than a dual pass heat exchanger and subject the heat exchanger to less pressure.

Here is a good blurb about water heat exchangers.

http://www.stewartcomponents.com/tech_tips/Tech_Tips_5.htm


Doug in Japan.