Sender: <marv@lancaironline.net> (Marvin Kaye)
To: flyrotary
Date: Tue, 22 Oct 2002 18:39:56 -0400
Message-ID: <redirect-1842691@logan.com>
Reply-To: "Tracy Crook" <lors01@msn.com>
From: "Tracy Crook" <lors01@msn.com>
References: <list-1841893@logan.com>
Subject: Re: [FlyRotary] Re: EWP Tech Data Take 1,000,002
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> 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

Thanks for the factory data Mike.
FWIW, I noticed that the later model 13B turbo & 20B pump impellers are
slightly larger in diameter (about 1/8" or so) than the 84 - 88 pumps I had
laying around.  Could make a difference in GPM capability.

Tracy