Besides that there is some difference of opinion
and conflicting reports from the field on the advisability of
running a double pass rad. Power Sport claims it is the root cause
of their cooling trouble but they have made many other changes besides
switching from a double pass to a single pass.
Paul Lamar

Mike Wills wrote:

  As I understand from previous messages Powersport has their oil-water
heat exchanger plumbed in parallel with the radiator with approx 10gpm
going exclusively through the oil cooler and bypassing the rad. If this is
the case it seems to me that this could explain why the Powersport config
is so sensitive to flow restriction and why the 2 pass rad didnt work

for them.

Mike Wills

"Ray Richardson Jr." wrote:

Powersport diverts 10 gpm of just returned water from the rad.
(cooled water) and sends it to the oil to water cooler.
the water then is returned to the rad. to be cooled again.

Our engine water coolant flow rates are now 51 gpm through the
entire engine/ rad system.  The 10 gpm diverted to the
oil to water cooler has not change our coolant flow rates

Our test show our system does 51 gpm with or with-out
the 10 gpm to the oil cooler turned on.

We have tested and proved,  the 2nd pass rad. reduced the
system flow rates to 31 gpm.

Diverting pressurized water to the oil to water cooler has
NO impact on the overall water flow rates.

Ray Richardson
Powersport

 
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