> Hello Paul-
    >
    > I got the custom pan back today, built per the V5 drawings you sent
    > earlier this week.  ...
     Mark


   Is there any validity to building the oil pan to act as the upper
   surface of the radiator wedge diffuser?  It might conduct some of the
   heat from hot oil without adding any extra weight- seems to be in
   approximately the correct position.

   Mike Parker


   Well from structural point of view and making one part do two jobs it
   looks pretty good. I think the drawback is every one degree F increase
   in the temperature of the air going into the heat exchanger reduces
   its effectiveness by one percent. So the idea is to keep the air going
   through the heat exchanger as cool as possible. Feed cold air to both
   oil cooler and water radiator.

   Now here is an old idea if you have room for it. Build the oil heat
   exchanger into the oil pan. Can anybody tell me what the drawbacks are?

   Paul Lamar ...No rotor no motor.



It still might be a good idea...  However, there isn't any
pressure-forced oil flow through the exchanger.

I think we've had this conversation before.

Turbulent flow is good for efficient heat transfer.  Getting air to take
heat from an exchanger necessitates deltaP in air across the exchanger -
powers the turbulent flow?   Isn't that true for the wet side of a heat
exchanger too?

Anyway, gravity can only create pretty low pressure.

Will there be any problem getting oil to go through the sump when cold?
Does the pan need a thermostat in it to allow thick oil to go through a
less restrictive passage?  For a Reno racer, maybe not.  But I don't
want to have to preheat the rotary powered plane that replaces my 182
just cause the temp is below freezing..

The good thing is that since it's not under high pressure, the exchanger
doesn't have to hold 300psi, like a regular rotary cooler.  That might
allow lighter construction which could make up for having to be
oversized due to low efficiency/slow flow rate..


Regards,

Matt-



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