> The stock water-pump pulley arrangement is inappropriate for
   constant
        > high RPM ,the biggest drawback is the stock water pumps are
       designed to
        > operate at relatively low speeds, as a result,the standard
       impeller WILL
        > cavitate-churn coolant rather than push it through the
   cooling system
        > when spun by stock pulleys at high revs(5, 500and6.000rpm
   ).The water
        > hoses are a clue to whats going on inside the waterpump,When the
        > impellers starts to cavitate,the hoses  jump around due to
   turbuence
        > caused by cavitation and the resulting aerated coolant,Racing
        > beat/mazmart/mazda offer a number of pulley combinations that
       will slow
        > water-pump speed suffiiently to avoid cavitation and  also slow
       down the
        > alternator,as the alternator is overdriven by appropximately
       33%-if the
        > engine is turning at 6.000rpm the alternator is spinning at
   8.000rpm,
        >
        > robert pay rotary owner from the 1970s/02/07,
        >
        > I think that is an urban myth Robert. Not what we found with
        > our water pump dyno. No cavitation at up to 7000 RPM as I recall.
        > You need a lot of water flow to cool an aircraft engine
        > as it runs 150 HP all the time. A car is lucky to see 40 HP
        > all the time. Might be true on an 11,000 RPM race car engine.
        > It will cavitate if you let the water level in the block get too
        > low.
        >
        > Paul Lamar ...No rotor no motor.

       Isn't that cavitation erosion in the two water pump pix?

       Doc Custer
       Retired Software Engineer and sometime Audiologist

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

       Yes caused by low water level in the engine.
       Note the dividing line is horizontal.

       Paul Lamar ...No rotor no motor.


   Thanks paul,If some people are in need of a company that can make
   eccentric shafts and grind epitrochoidal forms try www.
   Polgain.co.uk <http://Polgain.co.uk>
   <http://Polgain.co.uk>        used this company when I was replating
   NSU/norton rotory housing in the 1990s  the man to talk to is adrian
   Bond he has worked on rotaryengines from RR to NSU/ may not be the
   cheapest but they do know what they are doing.......robert
   pay

   Do you know the great Emon Hurley?

   I have  another question for you if you don't mind. Not
   related to rotaries. Do they adjust the weight or other handicapping
   methods on the British Touring Car racers? How come Seat's and
   Vauxhaul's beat BMW's?
   --
   Paul Lamar ...No rotor no motor.


Yes Paul i do know Emon Hurley,must be all of 30yrs on and off,as to the
BTC yes they do handi cap the cars, so if you start to run away from
everybody,they add weight to your car,It works very well making for very
close racing.....................robert pay old rotary

Emon is a great guy. I visited him in Coventry a few years ago.

So the way to cheat is sand bag when ever possible and
just win by a nose :) Not exactly one car is better than any
other is it? :) I don't know why they bother to mention the car's
brand names. Fun to watch on TV however.