Hi Paul,

I have to build and install louvers to control air flow through the
radiators (water and oil).
Is it better to install the louvers in front or back of the engine cowling?
I think it would be easier for me to install it  in front of the cowling,
that way one setup would control the air flow to both radiators.  I have no
water thermostat and no oil thermostat so I have to control the temp with
the air flow.

In the photo the air inlet for the oil rad. is on the left.
A month ago I had not enough cooling, now I have too much.
In the meantime I modified my cooling system.  I changed the radiators and
modified the air ducts.

Here is what I now have.
A Griffin water radiator  no: GRI-2-58185-X, crossflow, dual row,   1-1/4"
tubes
core 18" X 13" X 2.75"    234 sq. in.     643 cu. in.

Original RX7 oil radiator  core 17.5" X 4.5" X 2" ,     78 sq. in. ,     157
cu. in.

I built an oil/water heat exchanger and added that in series with the RX7
oil rad.

I think this last system works --- finally

Air flow;
Water rad air in 84 sq. in.      air out 180 sq. in.
Oil rad air in 40 sq. in.     air out 54 sq. in.

The outside air temp is presently between 30 and 40 deg. F. so it is hard
for me to tell how it will work in the summer but the indications are good.
I had to plaster the front of the water rad. with duct tape to raise the
engine temp. and block the oil rad. air exit to reduce air flow.  The oil
rad. air flow is reduced to 12 sq. in. at the moment and not much air is
flowing through the water rad.

Rino
Renesis powered Glass Goose

Cool Rino :) One advantage of living in Canada in the winter. You don't have to
worry about your rotary powered aircraft over heating :) Must be global cooling :)

Yes louvers in the front will work great. The Russians have been using them
for  years on the air cooled radial Yaks. Just about every trucker in the
world uses them in the winter. NASCAR racers go faster on cool days by
partially blocking the rad air inlets.

Use an old air cooled V dub thermostat to control them.

Good work Rino. You have achieved a lot cramming a rotary and a cooling
system into a very small space.

Paul Lamar