Return-Path: Received: from imf23aec.mail.bellsouth.net ([205.152.59.71] verified) by logan.com (CommuniGate Pro SMTP 4.2b6) with ESMTP id 300275 for flyrotary@lancaironline.net; Fri, 09 Jul 2004 06:29:02 -0400 Received: from [68.223.130.10] by imf23aec.mail.bellsouth.net (InterMail vM.5.01.06.08 201-253-122-130-108-20031117) with ESMTP id <20040709102831.DRPO1779.imf23aec.mail.bellsouth.net@[68.223.130.10]> for ; Fri, 9 Jul 2004 06:28:31 -0400 User-Agent: Microsoft-Entourage/10.1.4.030702.0 Date: Fri, 09 Jul 2004 06:28:16 -0400 Subject: Re: [FlyRotary] Re: Turbo post mortem From: Bulent Aliev To: Rotary motors in aircraft Message-ID: In-Reply-To: Mime-version: 1.0 Content-type: multipart/alternative; boundary="B_3172199299_44045481" > This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. --B_3172199299_44045481 Content-type: text/plain; charset="US-ASCII" Content-transfer-encoding: 7bit I was also thinking about the greater exhaust back pressure on the engine. That may cost some HP too? Bulent On 7/9/04 1:16 AM, "Russell Duffy" <13brv3@bellsouth.net> wrote: > > > """ 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) > --B_3172199299_44045481 Content-type: text/html; charset="US-ASCII" Content-transfer-encoding: quoted-printable Re: [FlyRotary] Re: Turbo post mortem I was also thinking abo= ut the greater exhaust back pressure on the engine. That may cost some HP to= o?

Bulent

On 7/9/04 1:16 AM, "Russell Duffy" <13brv3@bellsouth.net> w= rote:



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


That doesn't sound right.  How big is the wastegate, and what style (i= e,
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. <g><= BR>
      <Marv>

Marvin,

John's comments are probably right on the money. &= nbsp;One of the most significant problems is that the stock turbo's have sma= ll, internal wastegates.  They are barely adequate in the cars, even wi= th serious restrictions in the intake, and exhaust systems.   His = numbers indicate that he was putting out close to 10 psi, plus whatever he w= as losing through the half inch hole.  When you consider that he was do= ing 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)

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