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Oh, now that makes sense. Leon to the rescue again.
BTW, my previous post was supposed to be a reason for not using an
exchanger, not so much a request for a solution. But now with your input it
could be feasible IF, like Ed says, your installation really only has room
for a large Rad but not an oil cooler.
Dave Leonard
The Mazda one
will work just as efficiently if you feed it with water from the COLD side
of the rad. It's a really robust unit, and I've never seen one leak.
Hope this clarifies the situation ...
Cheers,
Leon
P.S.
I get my cold water under pressure by drilling & tapping into the
water pump
housing just before it goes into the block. Works a treat!!
----- Original Message -----
From: <daveleonard@cox.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Saturday, January 08, 2005 12:46 PM
Subject: [FlyRotary] Re: oi/water Exchanger [FlyRotary] Re: fluidyne oil
cooler
> I was considering the idea when I was planning my installation
and one big
question kept popping into my mind: which side of the rad do you put the
interchanger?
>
> If you put the interchanger on the hot water coming out of the
block, that
water is at least 180deg. This hot water will have a very hard
time cooling
that oil, and best case could only get it down to 190 or 200.
Likewise the
water is likely to boil before it get to the radiator since it is starting
at 180 (at least) and going up from there.
>
> If you put the interchanger after the radiator it will probably
do a good
job of cooling the oil, but now you will be heating the water right before
it goes back into the engine. In order to keep the water from overheating
in the engine it will have to come out of the heat exchanger relatively
cool, which mean it has to come out of the rad really cool. To
get it that
cold comming out of the rad that cold (assuming you had a big enough rad),
the temperature gradient really has to drop and the rad becomes very
inefficient as it is trying to cool the coolant that extra 20 deg.
>
> I decided the only efficient way to do it was to have two rads,
one after
the interchanger and one before it. I suppose that would work if you were
using 2 evap cores in series, but for me the obvious solution was
to use an
oil/air cooler.
>
> Dave Leonard
>
> >
> > Good points of course, but I still can't help but be drawn to the
simplicity
> > of having only one scoop, one duct, and one radiator. Even as I type,
I'm
> > trying to figure out where I can put a bigger radiator
(within cosmetic
> > limits this time) :-) I'm even warming back up (so to
speak) to the
idea
> > of using the stock 1st gen oil/water exchanger for the single
rotor. It
was
> > pointed out to me that the stock unit took hot water from the heater
outlet,
> > which doesn't really give the heat exchanger the best chance
of success.
> >
> > If I get Ken's oil/water exchanger, I'll be mighty tempted to
hook it up
to
> > the current two radiators to see how it does on the ground. Since I'm
not
> > opposed to changing out the evap cores, there might be a way
to enlarge
the
> > capacity some. Barring all that, it'll make a nice paperweight.
> >
> > Cheers,
> > Rusty (now collecting oil coolers instead of manifolds)
> >
> >
> >
> >
>
>
> >> Homepage: http://www.flyrotary.com/
> >> Archive: http://lancaironline.net/lists/flyrotary/List.html
>
>> Homepage: http://www.flyrotary.com/
>> Archive: http://lancaironline.net/lists/flyrotary/List.html
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