Al Gietzen wrote:

Mike;

Did you see the measured flow data I posted here just before everyone went
off to OSH?  It appears to be quite adequate to powers somewhere beyond 200
hp.  Check it out.

Al

Mike Wills wrote:

Al,

  I just looked that data over. My question is if a portion of that flow is
intercepted and sent through the oil cooler and never enters the engine is
the remainder still adequate? And if the Powersport cooler is in fact
plumbed in parallel with the engine (which appears to be the case from the
pictures) who knows how much of the coolant is taking the path through the
engine and how much is going through the oil cooler?

  The following is copied from an email sent direct to me from Fred Moreno
last year when I was contemplating an oil/water exchanger:

" I think I favor the heat exchanger at the coolant exit from the radiator,
and
the system reference tank and pressure cap between the exit of the oil
exchanger and the pump inlet. You always want the cap to be at the pump inlet
since this is the lowest pressure in the system, and you want this to be at
the cap pressure.
  I fear that if you take from the pump outlet through the oil cooler back to
the radiator (parallel flow), you may cause too much flow to go around the
engine.  I think
the pumps are a bit undersized for the rotary engines at 35 gpm and I would
like to see all this go through the engine and radiator.  The pressure drop
of coolant through the oil/coolant heat exchanger is very low and so most of
the flow would try to take this path instead of the engine.  Nice cool oil.
Nice hot engine. "

  I dont think Fred is on the list anymore as I havent seen anything from
him in a long time. He is a retired engineer who did cooling system
analysis for a living.

Mike Wills

No not on the list Mike. I myself will take the simple way out and use 
an oil to air radiator. Much easier to tailor to my exact cooling needs
be it water or oil.

Paul Lamar
 
The Aircraft Rotary Engine Newsletter.              Powered by Linux.

http://home.earthlink.net/~rotaryeng/            http://www.linux.org