"Johnson, Darren" wrote:
        >
        > With the issues I have been reading about the last couple of weeks with
        > the water pump is anyone running or considering running an electric
        > water pump?  I know they are primarily used to insure good flow at low
        > RPM's, not a condition we really worry to much about except in a long
        > taxi.  I know in V-6/8's I have seen claims of recovering 20-30 hp by
        > using electric vs. mechanical.  The only two reasons I can see not to
        > use them would be 1) another thing using electricity if you had an
        > alternator failure and 2) if you use the full controller setup it adds
        > about 6 pounds or so.

        I should have something on the web site like: "Why you should not
        use an electric water pump."

        1. It takes about 1 to 3 HP to pump enough water through a Mazda
        rotary engine running at 150 to 200 HP continuous to cool it.
        There are no two ways about that.

        2. One HP is 756 watts. It is not just a good idea. It is the law!

        3. 756 watts at 14 volts is 54 amps. Power = current times voltage.

        4. Show me an electric pump that will draw 54 amps.

        5. There is no magic in an electric pump. It uses the same
        technology that a mechanical pump uses. There have been no
        significant changes in the past 100 years on how much
        water that can be pumped with a given amount of HP
        despite the outrageous claims of the scam artist electric pump
        makers.

        Paul Lamar

"Johnson, Darren" wrote:

1) Wasn't sure on a rotary, on V-6/8's the figure my engine guy quoted me was 20 - 30 horse, but everything else I've seen is more in the 10-15 horse range, but I haven't seen any quotes other than yours as to what hp the pump eats on a rotary.
2) Sure you didn't mean to say 746 watts?

How much does the stock waterpump flow on a 13b?

Correct 746 watts! Memory loss. 20 to 30 horses is a myth.
So is 10-15. A water pump sized V belt won't transfer that kind of power.
Those numbers are bandied about by the scam artist to sell
their phony electric water pumps.

The first was on a 20B but I suspect it was a 13B pump.

Bill Schertz, do you have any larger versions of the jpg's you sent on this
subject?

Paul Lamar
 
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