Return-Path: <13brv3@bellsouth.net> Received: from imf23aec.mail.bellsouth.net ([205.152.59.71] verified) by logan.com (CommuniGate Pro SMTP 4.2b6) with ESMTP id 300088 for flyrotary@lancaironline.net; Fri, 09 Jul 2004 01:17:01 -0400 Received: from rd ([65.6.194.9]) by imf23aec.mail.bellsouth.net (InterMail vM.5.01.06.08 201-253-122-130-108-20031117) with ESMTP id <20040709051632.BLWS1779.imf23aec.mail.bellsouth.net@rd> for ; Fri, 9 Jul 2004 01:16:32 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Turbo post mortem Date: Fri, 9 Jul 2004 00:16:48 -0500 Message-ID: <000401c46573$ef5c8940$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0005_01C4654A.06868140" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.2627 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 This is a multi-part message in MIME format. ------=_NextPart_000_0005_01C4654A.06868140 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit """ By the way, I was showing 38 MAP at 11,500 ft with the wastegate fully open. However, there's an open 1/2 inch air bleed on the intercooler (to be closed off) and a blow off valve, so the turbo may have been putting out much more than the MAP showed.""" That doesn't sound right. How big is the wastegate, and what style (ie, throttle plate or Delta-gate (or Race-gate)? With the wastegate fully open the majority of the exhaust should be bypassing the turbo. Or am I misunderstanding your comment? WOuldn't be the first time. Marvin, John's comments are probably right on the money. One of the most significant problems is that the stock turbo's have small, internal wastegates. They are barely adequate in the cars, even with serious restrictions in the intake, and exhaust systems. His numbers indicate that he was putting out close to 10 psi, plus whatever he was losing through the half inch hole. When you consider that he was doing this for hours, rather than seconds (as it was designed for), it's not surprising that it failed. I've got my fingers crossed for the Oz mod. At least it should give the turbo a fighting chance. Cheers, Rusty (very satisfied Todd's Canopy customer) ------=_NextPart_000_0005_01C4654A.06868140 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Message

""" By the way, I was showing 38 MAP at 11,500 ft with = the=20 wastegate fully
open.
  However,  there's an open 1/2 = inch air=20 bleed on the intercooler (to be
  closed off) and a blow off = valve, so=20 the turbo may have been putting out
  much more than the MAP=20 showed."""


That doesn't sound right.  How big is the wastegate, and = what style=20 (ie,
throttle plate or Delta-gate (or Race-gate)?  With the = wastegate=20 fully open
the majority of the exhaust should be bypassing the = turbo. =20 Or am I
misunderstanding your comment?  WOuldn't be the first = time.=20 <g>

      <Marv>

Marvin,

John's comments are = probably right on=20 the money.  One of the most significant problems is that the stock = turbo's=20 have small, internal wastegates.  They are barely adequate in=20 the cars, even with serious restrictions in the intake, and = exhaust=20 systems.   His numbers indicate that he was putting out close = to 10=20 psi, plus whatever he was losing through the half inch hole.  When = you=20 consider that he was doing this for hours, rather than seconds (as = it was=20 designed for),  it's not surprising that it failed.  I've got = my=20 fingers crossed for the Oz mod.  At least it should give the turbo = a=20 fighting chance. 

Cheers,
Rusty (very = satisfied Todd's=20 Canopy customer)



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