Here is the mill set up for cutting out the old partition.
Use a 1/2 inch end mill five inches long over all.
If anybody needs this done send me your pump housing and and I will
saw it off and mill out the partition. You will then need to make
a new partition out of 1/8 plate and weld it in. I can also make a
1 1/2 inch OD hose hose barb for you cut at the required 25 degree angle.

Al Gietzen wrote:

Paul;

I had planned on this mod also when I first looked at the pump exit.  I now
wonder whether it will make a noticable difference unless you also modify
the coolant porting in the rotor housings.  I seems the big pressure drop in
the loop is in the housings.  The 4-rotor guys down here measured something
like a 50 psi drop at 40 gpm (they use a high performance pump).  That's
huge.

Maybe I'll wait and see what you find with yours.

Al Gietzen

I don't think so Al. If you measure all the area of the holes in the rotor
housings it adds up to way more than the area of the 1.25 ID of the cooling
lines. Same goes for the rad. On the other hand the total resistance 
to flow may be significant because it has to travel front to back and then 
back to front. It would be interesting to measure all the pressure drops. 
If I did all I wanted to do in the way of instrumenting the engine I don't 
think I would ever get it to fly. Too bad we don't have a pipeline
into Mazda engineering. I am sure they know all this stuff.

Paul Lamar
 
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