Return-Path: Received: from bewersdorff.com ([192.220.83.90] verified) by logan.com (CommuniGate Pro SMTP 4.1.3) with SMTP id 2579265 for flyrotary@lancaironline.net; Sun, 14 Sep 2003 16:56:23 -0400 Received: (qmail 60314 invoked by uid 21338); 14 Sep 2003 20:56:23 -0000 Received: from unknown (HELO rapunzel) ([216.101.149.124]) (envelope-sender ) by 192.220.83.90 (qmail-ldap-1.03) with SMTP for ; 14 Sep 2003 20:56:23 -0000 From: "Marko Bewersdorff" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] Re: Good news, Bad news Date: Sun, 14 Sep 2003 13:50:16 -0700 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_02F5_01C37AC7.209E4630" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) In-Reply-To: Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 This is a multi-part message in MIME format. ------=_NextPart_000_02F5_01C37AC7.209E4630 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit MessageCan you remove the turbo for a noisy test run on the ground? see if you get more static on the ground then with turbo. Marko Once you can lay into it at WOT all the way up to 6,500, you should see at least 160HP performance or more. In my current configuration, I have to limit the throttle opening to about half throttle, to maintain 30 inches MAP. All along, I've been assuming that this give me the same power as a NA engine using full throttle. I know there are some losses with the higher temp of the intake, but I wouldn't expect them to add up to that much. Here's my question- Is my above assumption correct? I've tried to follow some intake flow discussions in the past on the RX-7 forum, where they were stating that pressure isn't everything. The idea (as I think I understood it) was that having good pressure registering on a gauge didn't guarantee anything, since the gauge isn't fast enough to show you what's really happening. They said that if the pipe was restrictive, or there was some other obstacle to flow (throttle butterflies half closed), you wouldn't get the power you should, because the pressure would drop instantaneously when the ports opened. When that happens, I guess the engine doesn't get the charge that it would appear to be getting from the gauge. Is this more or less what you're getting at when you say I need to be a WOT to get good power? Thanks for all the thoughts. Rusty (still baffled) ------=_NextPart_000_02F5_01C37AC7.209E4630 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Message
Can=20 you remove the turbo for a noisy test run on the ground? see if you get = more=20 static on the ground then with turbo.
 
Marko

Once you can lay into it at
WOT all the way up to = 6,500,=20 you should see at least 160HP performance or more.

In my = current=20 configuration, I have to limit the throttle opening to about half = throttle, to=20 maintain 30 inches MAP.  All along, I've been assuming that this = give me=20 the same power as a NA engine using full throttle.  I know there = are some=20 losses with the higher temp of the intake, but I wouldn't expect them = to add=20 up to that much.=20

Here's my question- Is = my above=20 assumption correct?  I've tried to follow some intake flow = discussions in=20 the past on the RX-7 forum, where they were stating that pressure = isn't=20 everything.  The idea (as I think I understood it) was that=20 having good pressure registering on a gauge didn't guarantee = anything,=20 since the gauge isn't fast enough to show you what's really = happening. =20 They said that if the pipe was restrictive, or there was some = other=20 obstacle to flow (throttle butterflies half closed), you wouldn't get = the=20 power you should, because the pressure would drop instantaneously when = the=20 ports opened.  When that happens, I guess the engine doesn't get = the=20 charge that it would appear to be getting from the gauge.  Is = this more=20 or less what you're getting at when you say I need to be a WOT to = get=20 good power?  

Thanks for all the=20 thoughts.
 Rusty (still=20 baffled) 



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