>
 > > Thanks, Bill.
 > >
 > > What is the size of your front radiator and cowl intake?
 > > I see you used the stock oil cooler.
 > >
 > > Did this arrangement cool satisfactorily?
 > >
 > > Scott Gettings
 > >
 >
 >
 > >I don't have that aircraft anymore. The cowling was made by me
 > (way to much
 > >work). The radiator was custom made and the oil cooler was
 > provided by the
 > >same company (not stock but same volume). They are located in
 > Indianapolis
 > >but I can't recall their name.
 > Bill Hyde
 >

So Bill used custom coolers!  I'm investigating sources, but it looks like custom may be the way to
go to get
exactly the size needed.  Almost all auto radiators are way too big.  Stock A/C evaporators (and
condensers?)
are much closer to the needed radiator size (12x17"), but would need to have larger intake and exit
tubes
welded on (I haven't found any with 1.5" connectors yet).  If any one hasany styles, brands or
custom suppliers
of smaller water/oil radiators they have had especially good luck with, please let me know!

In the front-and-side radiator option we've been discussing, it looks like there is a LOT more
potential room on
the cool side of the engine than in the front.  As the front (water) radiator gets to around 17x12"
(204 sq inches
area, and 400 cubic inches if 2" thick), it quickly determines the cowling size.  Keeping this
radiator as small as
possible will allow a small frontal area cowling, such as Bill did.

Perhaps a rectangular oil cooler of about the same area (but only 1" thick) should go up front??  Or
smaller and
1.5" thick.  This could  equate to the usual 190 cubic inches for the 13Boil radiator and give a
little smaller
frontal area.   It would  allow a larger and thinner water radiator on the side.  The downside is
the hoses would
all be much longer in this arrangement.

Yet another option is to keep a 400 cu. inch water radiator up front (accepting a slightly larger
cowling), but
make the oil cooler larger than the usual 190 cubic inches.   I know the stock oil cooler is good,
but the RX-8
uses two, appx. 7x9x2" coolers for about 240 cubic inches that are very light.

  Is there any disadvantage to letting a larger oil cooler assume more than its normal 1/3 share of
the total
cooling volume?  A 12x20x1" oil cooler would easily fit on the side, and if it were 1.5" thick would
be 360 cubic
inches of oil cooling volume.  Is this overkill?

Thanks again for helping with all these variables...

Scott Gettings


Try Ed Kelpeis he can build you almost anything.
The oil cooler can be any size. The main thing is it must
be good for 150 psi or more. Better to test to 300 psi.

Edward Klepeis <techwelding@comcast.net>


Paul Lamar ...No rotor no motor.

Take a look at summit racing . I used a griffin 13/18/2  with 1.5 and
1.75 hose necks. Both necks are on the same tank.

Geir