Paul,
I really hope that you design us a suitable low-mounted water pump or
that someone knows of a suitable pump that can be adapted.  This will
require me to rework my RV-4 motor mount scheme but I think that the
benefits of this pump location make this worthwhile.  Sign me up if
you move forward with this project.

Ken Powell

I got the design done today. The pattern will go in the foundry in a
couple
of weeks. Uses the stock Mazda pump cartridge. Mount it like
an alternator so you can tension the belt.

We talked about this years
ago and Jeff Spitzer and Paul Yaw were going to improve the flow
on the stock Mazda pump. Never happened. This achieves that by a
straight
shot in and a straight shot out unlike the stock pump with its sharp 90
degree
turns.

Paul Lamar

Will this pump be suitable for 3 rotors too?
Chris

I was surprised that the three rotor pump is the same size more or less
as the two rotor pump. Must be because the Cosmo road load HP is not that much different
than an RX7. This pump should work better on a three rotor in aircraft use.

Here are pics of the plastic pattern prototype. I'll do a final pattern shortly.
I did this one to check the fit of the stock Mazda cartridge.

Paul Lamar

Tom Webber wrote:

Paul do you still need the modeling clay test done?  Tom Webber

Yes if you don't mind Tom. I'll need the info when I start machining
them. also take a picture of the impeller
as there seems to be many changes from year to year.

Also I would like a scrap pump with a bad bearings and seals.
I will pay core value and shipping.

Paul Lamar
 
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