Return-Path: <13brv3@bellsouth.net> Received: from imf19aec.mail.bellsouth.net ([205.152.59.67] verified) by logan.com (CommuniGate Pro SMTP 4.1.3) with ESMTP id 2574933 for flyrotary@lancaironline.net; Wed, 10 Sep 2003 12:31:29 -0400 Received: from rad ([68.212.14.21]) by imf19aec.mail.bellsouth.net (InterMail vM.5.01.05.27 201-253-122-126-127-20021220) with ESMTP id <20030910163129.GKTB24929.imf19aec.mail.bellsouth.net@rad> for ; Wed, 10 Sep 2003 12:31:29 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: turbo wastegate requirements Date: Wed, 10 Sep 2003 11:31:28 -0500 Message-ID: <003201c377b8$fc810eb0$0201a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0033_01C3778F.13AB06B0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_0033_01C3778F.13AB06B0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit On my 91 turbo there is a vacuum pipe which comes out of the waste gate and goes to the side of the turbo casing. It has a T for another vacuum hose connection which goes to a solenoid in the stock installation. The engine guy tells me that if this vacuum hose is open to the ambiant pressure, then the wastegate will be open. If it's blocked, then the wastegate will close. All I have to do to control the wastegate is fit a valve to this hose. Assuming this is a hose that goes from the wastegate actuator (big vacuum pot looking thing) to the compressor side of the turbo, it's using pressure to open the wastegate. If it's blocked, the wastegate opens at the actuator's normal spring pressure. If you leave it open, the wastegate stays shut, and pieces of apex seals start departing the engine :-0 --------------------- To be clear, when I said open, and blocked above, I was talking about the teed hose that runs off to the solenoid. I'm assuming the main hose from the turbo to the actuator is still connected. Rusty ------=_NextPart_000_0033_01C3778F.13AB06B0 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Message
On my 91 turbo there is a vacuum pipe which comes out of = the waste=20 gate and goes to the side of the turbo casing. It has a T for = another=20 vacuum hose connection which goes to a solenoid in the stock = installation. The=20 engine guy tells me that if this vacuum hose is open to the ambiant = pressure,=20 then the wastegate will be open. If it's blocked, then the wastegate = will close.=20 All I have to do to control the wastegate is fit a valve to this = hose. 
 
Assuming = this is a hose=20 that goes from the wastegate actuator (big vacuum pot looking = thing) to the=20 compressor side of the turbo, it's using pressure to open the=20 wastegate.  If it's blocked, the wastegate opens at the actuator's = normal=20 spring pressure.  If you leave it open, the wastegate stays shut, = and=20 pieces of apex seals start departing the engine=20 :-0
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To be clear, = when I=20 said open, and blocked above, I was talking about the teed hose = that runs=20 off to the solenoid.  I'm assuming the main hose from the = turbo to the=20 actuator is still connected. 
 
Rusty
 
 
 
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