I was thinking again. Sorry John Slade.

It looks like it might be possible to drive a water pump directly
off the E-shaft as shown in this picture of Racing Beats
1000 HP turbo three rotor.

This will solve a couple of problems. One; the plumbing of the
current pump castings is a bit awkward for rads as the inlet
to the pump faces towards the back of the engine. A 180 pipe bend
will solve this problem of course but it offends my desire to
make things simple.

If we drive the pump off the e-shaft the inlet to the pump will
then face forward making the water pump plumbing simpler and
more straight forward. It will also eliminate the need to belt
drive the pump and fab a  mounting bracket for the pump.

We can use the new pump housing casting and do a new cartridge
as the current impeller in the Mazda stock cartridge would rotate in
the wrong direction. A new cast iron impeller is rather easy
for me to make.

What do you think?

I am just in the thinking stage on this and it is well down the road
so don't hold your breath.

Paul Lamar

Hi Paul,

Since my radiators are near the MM plate, I don't have the 180 deg. bend
coming out of the pump, but I have another comment about the casting. In
the orientation shown on the 3D drawings, the alternator mount tab ends
up on the bottom next to the engine. It would be better moved to the top
outside corner.

Also on my original water pump housing the front surface of the
alternator mount tab is about 5 mm behind the front surface of the water
pump housing to provide correct alignment of the pulleys.  If you ever
make any more, it would be nice to have that milled during the
machining. If I use the tab it will necessitate rotating the pump 90
degrees and giving me a 180 degree bend in the hose back to the engine.

Bob White

- - - - - - -
http://www.bob-white.com
N93BD - Rotary Powered BD-4

I'll give this some thought. If I ever make anymore I'l rethink the mounting.
5 mm you say. Ok that is not much. About .2 inches.

Paul Lamar
 
The AirCraft Rotary Engine NewsLetter.  Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/            
Copyright 1998-2003 All world wide rights reserved.