It would appear that you could parallel a couple of EWPs and still be a
good bit below the power drain of the EDWP.  It would require a stout
alternator to carry 15 - 20 amps extra, but nothing extraordinary.  Good,
solid backup battery would be and/or dual system would be important.  But
that requirement comes with the EFI system already.
Waiting for some specifics from the guy who actually DOES it .... Jim S.

Michael Robert wrote:

> Al Gietzen wrote:
>
> >
> > From what little data I was able to find for the water pump on the
> > 20B, it will pump about 35 gpm at engine RPM of 6000.  Marginal, at
> > best, for that climbout on a 90 degree day.  At altitude, at cruise;
> > the EWP may be able to handle it.
> >
>
> Gentlemen: as a data point I have in front of me the factory service
> manual for the 1985 RX-7. The Technical Data section lists the water
> pump capacity as 150-160 liters per minute/39.6-42.3 U.S. gpm/33.0-35.2
> Imp. gpm at 6500 rpm of engine. They list a 1:1.18 eshaft/pump pulley
> ratio. Given that these numbers are for both the NA 12A and 13B models
> I'd definitely check to see if maybe that 20B might require a tad more
> flow especially running at 6K rpm at a relatively high power setting.
>
>     -Mike Robert
>
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