Diverting pressurized water to the oil to water cooler has
NO impact on the overall water flow rates.
Ray Richardson
Powersport
Mike Wills wrote:
Didnt mean to imply the oil-water cooler did impact the flow rate. But if
you start with 51gpm for the system (I'm assuming this means 10gpm to the
oil cooler and 41gpm to the engine) and then reduce that to 31gpm with a 2
pass rad (still 10gpm to the oil cooler and now only 21gpm to the engine) I
can see why there may be a cooling problem. Other folks here (who arent
using the oil-water cooler) have successfully used 2 pass radiators as well
as other flow restrictive configs without a problem while using the stock
Mazda water pump and pulleys.
So I'm suggesting that perhaps your cooling system is more sensitive to
flow restriction in the radiator due to the 10gpm that gets diverted away
from the engine to the oil cooler. How else would you explain the fact that
the 2 pass works for others but didnt work for you?
What is the core size on the Powersport radiator?
Mike Wills--
"Ray Richardson Jr." wrote:
Dear Mike;
I really do not know how more plainly or clearer
I can say that the diverted 10 gpm
HAS NO EFFECT ON THE ENGINE FLOW RATES !!
We have 51 gpm PLUS 10 gpm
We had 31 gpm plus 5 gpm last year, and also tested
31 gpm PLUS 10 gpm with the 2nd pass rad.
These recorded flow rated were recorded on our test stand
under ideal conditions with calabraded flow meters and shut
off valves installed.
We welcome to review the tested flow rates data the
rest of you have done, to prove your opinions.
Ray
Amazing Ray. 61 gallons per minute out of the stock Mazda pump.
Got any pictures of your test set up? What are your pulley diameters?
BTW what pressure cap are you running? Pump cavitation is somewhat
a function of the system pressure.
Paul lamar
Ken Powell wrote:
Monty and I were discussing the Mazda pump and he noted the quality of the housing and the pump; this made me wonder why it didn't seem to work better because you certainly could not look at the pump and see obvious mistakes (except the small opening for the outflow). Ray's numbers indicate that the pump is not the problem. Also note that Tracy and others are getting adequate performance with installations that theoretically should not work. I think that Ray is correct and the pump is not the problem. Ray's numbers prove this for me - Ray, thanks for sharing your research. This is very important and I know that I could not have duplicated this test. Design a cooling system with low resistance and there will not be a problem. Paul's efforts to open the flow out of the water pump should also promote more flow and less restriction.
Ken Powell
kenpowell@aristotle.net
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