Bill Freeman wrote:

Paul,

Howard Wilkinson wrtoe:

 Using the foam method would allow you control of the result, minimize

shipping problems, and free you to do what you are good at.... design....

and let

someone else do the part they are good at.... casting.....    I strongly

recommend this

approach.    Below are two excellent small scale metal casters who are

considerably

beyond hobby class expertise.   Of the two I would recommend Jerry as he does
some foam work already and can advise you.    I don't know if Charles

does.   Hope

this helps some...... do it right.

                                        H.W.

I think Howard is absolutely correct on this one.  You guys that have special
needs in the water pump line need to work up a good pump design,
make an accurate high density foam model, verify it fits and have one of
the hobby+ casters make you one.  Machine it up and then go on your
way to test (professional dyno testing?). Once proven, make 20 or whatever
to meet the needs of the group.  How about integrating Jeff's new impeller
mod/redesign?

This seems much better than chopping up a stock pump.

BTW - RE my previous post on water pumps.  Are there not generic
(nonMazda) external racing water pumps that would work and could
be relocated to provide proper packaging, utilizing a blankoff plate with
proper inlets & outlets on the block?

Bill
Long EZ builder & pilot
mechanical engineer

We have not found one so far Bill. Jim Mederer (RB) uses a Chevy sprint car
pump but that will not take belt side loads. It must be driven from
the end of the e-shaft and it has two outlets and not one.

Here is plan D. Simplifies the pump, more efficient with no right angles in the
outlet. Simplifies the plumbing as the outlet comes come straight out the
top towards the inlet to the block. The down side is you lose one hold down
bolt with the stock Mazda cartridge. Could be fixed if it leaks by drilling
two new holes, one on either side of the outlet tube.

You will probably have to mount it above the alternator to clear the plumbing.

Paul Lamar
 
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