The RX8 core is a good core to use as are Chrysler Doge pick up cores.
Large frontal area with thin cores.
The Dodge core is 20" by 30" and is very very effective in a cross counter
flow configuration on the TTC engine. Two cores back to back.

Let's take the Dodge in a non cross flow config.

20 by 30 is 900 square inches.

We have learned more about this subject since Neil Ungar started flying
and on the time to climb engine. Neil complained about over cooling.
It appears we can reduce the intake area of the wedge diffuser to 15%, of
the frontal area of the core, from the  20% recommended previously.

In other words 15% of 600 square inches is  90 square inches.
The core is 20 inches wide so the height of the 4.5 inches high
and 20 inches wide.

Both Neil and the TTC  rads are directly in the prop blast so if
that is not the case then you may note higher water temp
when taxiing.

Here is the dodge core on top with the diffuser underneath.
Yet another 3D :-) It is far enough forward to give room for
the intake manifold behind it. This leaves room underneath for
and oil cooler.

The exhaust out the back of the cabin may help to attach more
air to the aft sides of the cabin. This is a problem that was addressed
by vortex generators previously (or in addition).

Paul Lamar

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