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Hi, Mark....I was reading a recent post on this site from Lynn Hanover, in
which he talks about the advantages of using a pressurized expansion tank.
He calls it the Mazda system (ie the way they used to do it) and calls the
unpressurized system the "auto system" (the way most still do it-but not
all).
snip..".With the pressure cap in the system between the radiator and the
recovery bottle, any coolant that gets by the cap and into the bottle cannot
be recovered until the engine has cooled to ambient, or close to it. Only
then will the system pressure drop below ambient and coolant in the bottle
will be at ambient, and thus at a higher pressure, so it replaces the
coolant lost by the system. (Not all of it, but close). snip....Earlier
rotary powered cars had a plastic bottle on the firewall, and that bottle
had the pressure cap on it. The advantage here was that the engine didn't
have to cool all the way down to recover coolant from the recovery bottle.
Small volume changes from changes in heat load would cause fluid exchange
from the pressurized bottle to the top of the radiator. Coolant entered the
bottle from the bottom, so a slug of air forced out of the radiator would
pop to the top of the recovery bottle and when power (and heat) was reduced
in the engine it would recover only water from the bottle."
"The advantages to the old Mazda system are: it will return all of the
coolant in the bottle to the engine in case of a leak. You get nothing back
from the "car" system until the plane is on the ground and cold. this system
is much better at removing air from an operating system. The weights are
about the same for both.
You can mount either system anywhere. They don't need to be higher than
anything to work. The car system is just a little less well off when mounted
low but not a problem, but it is open to ambient. The Mazda bottle can be
mounted ANYWHERE so long as it is upright. And "anywhere" can be a handy
location." Quoted from a message from Lynn E. Hanover.
I was trying to copy this system, so that I could mount the expansion tank
anywhere. It just turned out that the firewall was pretty close, and would
only require two short hoses. I may have missed some important items here.
If you would like, I can probably scan the entire message and e-mail it if
you are interested in reading the complete e-mail? Hope you find this
interesting. Paul Conner
----- Original Message -----
From: "Mark Steitle" <msteitle@mail.utexas.edu>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Wednesday, March 03, 2004 8:24 AM
Subject: [FlyRotary] Re: ready to start?
> Paul,
> Good luck on your first run. That's a big milestone. I see that your
radiator
> is a dual pass design. From what I see in the picture, I would put a
small
> fitting on the
> uppermost point of the left tank and run it back to the side fitting of
the
> expansion
> tank. Otherwise, I don't see how air pockets can be cleared. Also, the
exp.
> tank needs to be higher than the thermostat housing else you can never
fully
> fill the system.
>
> Mark S.
>
> At 12:20 AM 3/3/2004 -0500, you wrote:
> >Hi, fellow rotary enthusiasts....Here are a couple of pictures of my 13b
> >engine installation. I'm getting ready to start it and only run it for
> >possibly 30 seconds and then check for leaks, etc. I would appreciate
any
> >comments regarding anything that doesen't look right. The alternator
belt
> >is not on in this picture, but it will be. Also, the oil cooler is
> >temporarily bypassed just to see if it runs, then I'm taking the banjo
> >fittings to the local hydraulic shop to have hoses crimped on. I checked
> >for spark, and it appears adequate. Thanks for any and all input. Paul
> >Conner
> >
> >
> > >> 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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