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


goerge

You bring up great points........I have searched all over for the right
unit with the properties mentioned.  The impeller styles I have seen off
the shelf are either too heavy, too plastic, sloppy fit, weak shafts, on
and on....I was interested in the drive and bearing hosing..

I may get slammed here but is it out of the realm of possibility to use
an inlet  impeller of a turbo charger...? That type of design is what I
have been looking for with no luck...


jeff


I have a gut feeling they will not be tough enough. The only thing that seems to hold up is cast iron or sheet steel.

The problem I have with the BMW is the way the water comes in. It is not good to have a right angle where the water comes in. The Ford and Chrysler are better in that regard. If the Chrysler rotates in the right direction I would use that over the Ford.

Paul Lamar