Paul

I just sent out 2 more units.  so far there have been 5 sent out.....I
have 6 units machined and ready to ship now..

If there is anyone out there I missed please let me know.............

Water pump
http://www.car-stuff.com/exclusives/bmw/328i-water_pump.html


I found a Graf pump on a BMW that may work here, check it out...



thanks

jeff

-----------------------------------------------------------

Think about wiggins couplings on all in and out.
That is pretty inexpensive for a BMW. Looks like it will work.

Paul Lamar



Paul and Jeff, The pressure of centrifugal pumps is dependent on the
difference between the inlet diameter and the outside diameter of the
impeller and the pictured pump while inexpensive doesn't look to be designed
for much pressure. The rotational speed from the relatively small drive
sheeve  if connected to the stock e-shaft sheeve  could exceed 15,000 rpm at
an engine speed of 6,000RPM, not good for long term durability.Also the
sheat metal impeller looks a little thin with straight blades also not the
best design. And finally any brand of pump not used on an engine designed
for more than the 250 HP of a p-port would seem undersized leading me to
think some type of 1970's detroit big block V8 might be a good start. For
instance the smallest HP used in the oldsmobile toronado was 375 HP and many
were 425HP.  The ford engines as I remember used a 32 PSI radiator cap much
higher than the GM systems.

Increasing cooling system pressure would raise
the boiling point of the coolant which would be particularly beneficial in a
series cooled rotary. Personally I went with the 426 chrysler pump which
will be backpressured by the restriction imposed by the rotarys  smaller
cooling passages and hopefully provide higher flow velocitys and turbulance
through the block. As far as I know none of these engines used a closed face
impeller as used on the higher pressure industrial pumps, however minimizing
the running clearences between the impeller face and pump housing is a close
approximation.
         Possibly someone who worked in a autoparts store in the 1970's
might recall what engines used cartridge style pumps. One other one is the
331, 354, 392, 398  desoto, chrysler, imperial waterpump.
       On the wish list for a new front cover, how about  a provision for
some gerotor type dry sump pumps and a boss for a backup magneto for the
redundant ignition.

george.grimes7@gmail.com