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
 
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