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Message
For efficient heat transfer from the oil to the
exchanger metal, you want to have turbulent flow, which is achieved in the Mazda
cooler by flow passage design and (I think) turbulators in the tubes. You would
not have that with a water core in the oil pan, because the oil would be moving
slowly through the pan to the pick up tube.
Doesn't say it can't be made to work, but you would
need larger surface area. Oil has poor heat conductivity, so the oil near
the cool surface prevents the heat from going from further out to the cool
surface (acts like an insulator). By having the oil flowing rapidly, the cool
oil near the surface is mixed with hotter oil in the main stream.
Bill Schertz
KIS Cruiser # 4045
----- Original Message -----
Sent: Monday, April 30, 2007 7:40
AM
Subject: [FlyRotary] Re: oil
coolers
The new core mat. that I use
for my coolers is just like oem mazda
high pressure and same overall size.
I can make them wider if need be. My
question is there that much of an
advantage in the oil/water over the
oil/air cooler being that
there is more lines to hook up with the oil/water
system.
Hi Ed,
I've always liked the oil/water heat
exchanger concept, but as you say, there's more to hook up. Along
those lines, an idea that I've never seen fully tested is a water core inside
the oil pan. The advantages would be that you don't need extra
space for an oil cooler, and you have only one pressurized oil
hose. The oil pickup tube is a bit of an obstacle, but with
your welding talents, I'm sure you could work around this.
I'm currently testing the same
concept on the single rotor stand, but I'm using a Fluidyne exchanger rather
than the oil pan. I really think it's going to work well, but it
would be nice to eliminate the extra hoses by making this all in the oil
pan.
Cheers,
Rusty (where the heck do all these
Rotax parts go...)
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