Return-Path: Sender: (Marvin Kaye) To: flyrotary Date: Tue, 22 Oct 2002 18:42:29 -0400 Message-ID: X-Original-Return-Path: Received: from cpimssmtpu12.email.msn.com ([207.46.181.87] verified) by logan.com (CommuniGate Pro SMTP 4.0) with ESMTP id 1842261 for flyrotary@lancaironline.net; Tue, 22 Oct 2002 12:20:57 -0400 Received: from BigAl ([68.7.218.110]) by cpimssmtpu12.email.msn.com with Microsoft SMTPSVC(5.0.2195.4905); Tue, 22 Oct 2002 09:19:37 -0700 X-Original-Message-ID: <000f01c279e7$06871ec0$6400a8c0@BigAl> From: "Al Gietzen" X-Original-To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: EWP Tech Data Take 1,000,002 X-Original-Date: Tue, 22 Oct 2002 09:21:06 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000C_01C279AC.59BD01D0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2720.3000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 X-Original-Return-Path: alventures@email.msn.com X-OriginalArrivalTime: 22 Oct 2002 16:19:37.0205 (UTC) FILETIME=[D0C8BA50:01C279E6] This is a multi-part message in MIME format. ------=_NextPart_000_000C_01C279AC.59BD01D0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Al Gietzen wrote: > =20 > From what little data I was able to find for the water pump on the=20 > 20B, it will pump about 35 gpm at engine RPM of 6000. Marginal, at=20 > best, for that climbout on a 90 degree day. At altitude, at cruise; = > the EWP may be able to handle it. > =20 Mike Robert wrote: Gentlemen: as a data point I have in front of me the factory service=20 manual for the 1985 RX-7. The Technical Data section lists the water=20 pump capacity as 150-160 liters per minute/39.6-42.3 U.S. = gpm/33.0-35.2=20 Imp. gpm at 6500 rpm of engine. They list a 1:1.18 eshaft/pump pulley=20 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. It wouldn't surprise me at all that Mazda used the same pump on the = 13B and the 20B; and that the one data point that I have may be for the = 13B. It is reasonably consistent with the data you give. The V-belt = pulleys (o.d.) on my 20B are 4.5 eshaft and 3.75 pump (belt efffective = diameters about 3.75/3) or a ratio of 1.25. These may not be stock - = were installed by David Atkins. This may give a bit more flow than the = 13B spec. Not sure what pump is on my engine, but the 13Brew may have = slightly higher flow as well. I hope to eventually measure the flow I = get. Al ------=_NextPart_000_000C_01C279AC.59BD01D0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 
Al Gietzen wrote:

> 
> From what little = data I was=20 able to find for the water pump on the
> 20B, it will pump = about 35 gpm=20 at engine RPM of 6000.  Marginal, at
> best, for that = climbout on=20 a 90 degree day.  At altitude, at cruise;
> the EWP may be = able to=20 handle it.
> 
Mike Robert wrote:

Gentlemen: as a = data=20 point I have in front of me the factory service
manual for the = 1985 RX-7.=20 The Technical Data section lists the water
pump capacity as = 150-160 liters=20 per minute/39.6-42.3 U.S. gpm/33.0-35.2
Imp. gpm at 6500 rpm of = engine.=20 They list a 1:1.18 eshaft/pump pulley
ratio. Given that these = numbers are=20 for both the NA 12A and 13B models
I'd definitely check to see if = maybe=20 that 20B might require a tad more
flow especially running at 6K = rpm at a=20 relatively high power setting.

 It = wouldn't=20 surprise me at all that Mazda used the same pump on the 13B and the = 20B; and=20 that the one data point that I have may be for the = 13B. =20 It is reasonably consistent with the data you give.  The V-belt = pulleys=20 (o.d.) on my 20B are 4.5 eshaft and 3.75 pump (belt efffective = diameters=20 about 3.75/3) or a ratio of 1.25.  These may not be stock - were=20 installed by David Atkins.  This may give a bit more flow than = the 13B=20 spec.  Not sure what pump is on my engine, but the 13Brew may = have=20 slightly higher flow as well.  I hope to eventually measure the = flow I=20 get.
 
Al
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