"Thomas Jakits" <
rotary.thjakits@gmail.com>
wrote:
> Hi Bob,
>
> thanks for your
reply!
>
> In both installations the oil-cooler is above the oil
level by a good
> margin.
>
> In my opinion the inlet
position is not the critical issue, but the outlet.
>
> As the
oil slows down considerable in the inlet tank, it may (or not) loose
>
the ability to push all the air out in front of it.
> If at the
initial filling of the cooler after start-up (or opening of the
>
thermostat) air gets trapped at the top of the cooler, this air never
gets
> pushed out, just compressed to oil pressure values.
>
With a top outlet, the air has no choice but leave the cooler through
the
> outlet....
>
> Am I way out there
?????
>
>
> thjakits
>
> On Tue, Nov 11, 2008
at 2:46 PM, Bob White <
bob@bob-white.com>
wrote:
>
> > Hi Thomas,
> >
> > If the oil
cooler is below the oil level in the bike, I don't think top
> > or
bottom inlet will matter too much. If it's above the oil level
in
> > the pan, then bottom inlet will ensure the cooler is always
full of oil.
> >
> > My 2 cents and that's probably more
than it's worth. :)
> >
> > Bob W.
> >
>
> On Tue, 11 Nov 2008 14:27:00 -0500
> > "Thomas Jakits" <
rotary.thjakits@gmail.com>
wrote:
> >
> > > Hi all,
> > >
> >
> I know this is a rotary and aviation list, but there is a lot of
cooling
> > > going on here, so I just dare to ask a OFF TOPIC -
no pics, so it should
> > > load quick too :)
> >
>
> > > I would like to ask specifically* Lynn Hanover*, but
if anyone else knows
> > > something too, please let me
know!
> > >
> > > Hopefully soon I will start to
restore my 79 R100S BMW bike.
> > > It does not have an oil
cooler yet, but it will when I am done with it.
> > >
>
> > My question regards the correct orientation of the cooler.
>
> >
> > > To my knowledge ALL BMW airhead OEM oil cooler
installations are with the
> > > connections at the bottom of
the cooler.
> > > I have a mangled specimen off a GS at home -
it seems to be a 6-row,
> > single
> > > pass
cooler.
> > >
> > > I posted this question on ADV,
but got no clear answer.
> > > I am still waiting for a
reply from one member who posted a reference to
> > a
> >
> cooler manufacturer that says cooler orientation does not matter
(in
> > > reference to the position of the connections
.....)
> > >
> > > # My concern is, that if the
outlet is at the bottom of the cooler, there
> > > may be a air
cushion trapped in the upper part of the cooler - depending
> >
on
> > > the oil pressure and heat, this may cause a significant
loss of cooling
> > > capacity - question: Right or
Wrong???
> > >
> > >
> > > Here the link
to the post on ADV if you care to discuss (Beware, if
> >
you're
> > > used to the polite, friendly and helping attitude
on this list, you may
> > > encounter a somewhat different trend
on other lists, ..... at times! ADV
> > in
> > >
general is a great place, just now and then one encounters ridicule
of
> > > varying degrees.....)
> > >
> >
>
http://www.advrider.com/forums/showthread.php?t=400352
("Oil Cooler
> > > Orientation")
> >
>
> > > All I really want is to confirm or refute my
view!
> > >
> > > Also, most "performance
installations" Sport, Racing - seem to support
> > my
> >
> suggestion - outlet on top....
> > >
> > >
http://www.advrider.com/forums/showthread.php?t=328831>
> >
http://www.advrider.com/forums/showthread.php?t=399841>
> >
> > >
> > > Any experience, data, tests
- you guys/gals?
> > >
> > > Next
question: Again orientation of the cooler.
> > >
> >
> On this list I learned a lot about ducting. Obviously here we
are
> > generally
> > > talking about 35-40 kts at a
minimum or at least a prop blast on the
> > ground.
> >
> On the bikes (I limit this discussion to BMW airheads) they are
installed
> > > vertical in front of the engine or on the right
side on top of a crashbar
> > in
> > > front of the
cylinder.
> > > Generally there are no ducts - one had a
"fairing" for optics at some
> > time.
> > >
>
> > Check the following thread and you will see either installation at
some
> > > point.
> > >
> > >
http://www.advrider.com/forums/showthread.php?t=51879
(Plenty of GS
> > > installations right away, a center
one is on a yellow bike nearly all the
> > > way at the bottom
of the 1st page....)
> > >
> > >
> > >
According to my wisdom gathered on this list, either installation
is
> > about
> > > useless:
> > >
>
> > # Most of the cooling air would go around the cooler instead of
through
> > > # Speeds are of course slower than with airplanes,
but the cooling is
> > worse
> > > when standing still
or in stop and go.
> > > # Cooling would be done mainly by
radiation in this situation. Question:
> > > True/False?
>
> >
> > > Question: Could cooling be improved in this
stop/go situation by
> > installing
> > > the cooler at
an angle (30-45 deg) so there would be some convective
> >
action,
> > > once the heated air leaves the back of the
cooler?
> > >
> > > I know, there is probably not
much action.....
> > >
> > > My plan (pending
replies...) is to have me a cooler custom welded (Ed
> > >
Klepeis ?), still need to guestimate the size: 2-pass, inlet at
the
> > bottom,
> > > outlet at the top.
> >
> Install with a 30 degree angle (top forward) and make a small
alu-duct.
> > > Question how long should the the duct be at a
minimum in front of the
> > > cooler?
> > > It will
probably not be a real duct, but rather a guide - aesthetics are
>
> of
> > > course of some importance on the bike!
>
> >
> > >
> > > Any airheads on this
list?
> > >
> > > Any suggestions?
> >
>
> > >
> > > At the end my 100S lived its life
without a cooler, but Austrian airs are
> > > way cooler than
Panamanian, so a cooler she will get! :)
> > >
> >
>
> > > Thanks for your time and suggestions!
> >
>
> > > thjakits
> > >
> >
>
>
> > --
> > N93BD - Rotary Powered BD-4 -
http://www.bob-white.com> > 3.8 Hours Total Time
and holding
> > Cables for your rotary installation -
http://roblinstores.com/> >
> >
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