Hi Ed,
I came up with few minor improvements in the under the engine two 
pass rad you built for me. In the next one you make please replace the 
straight barb on the right side with a 45 degree tube bend. That 
will simplify things greatly. Also please add a bung for the 1/2 inch pipe 
connection to the water rez. Also we need to limit the rad core length 
to 19.5 inches which matches the length of the stock Mazda RX7
oil cooler. The width for the rad should be about 16 inches max
so there is room for the five inch wide RX7 oil cooler along side.

Given the two inch thick cores that will give us a core volume
of about 600 cubic inches which should be about right for the current
state of the art. Time will tell if that is too much or too little.
In theory it is too much and some day I hope someone tries a one inch core
in this position. A one inch core should cool better at lower speeds
not to mention being more efficient. All new car cores are about one inch
thick.

Jerry, Note there is room to move those Kis MM diagonal brace tube firewall
hard points up five inches and still clear the stock or custom oil
pan. That will allow a bit more flexibility for rad mounting.

Nothing like hind sight.
 
Paul Lamar
 
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