Return-Path: Received: from corpprd-pxy1.canfor.ca ([207.230.226.92] verified) by logan.com (CommuniGate Pro SMTP 4.1.3) with ESMTP id 2577316 for flyrotary@lancaironline.net; Fri, 12 Sep 2003 13:42:56 -0400 Received: from exchange.canfor.ca (mail.canfor.ca [198.162.162.49]) by corpprd-pxy1.canfor.ca (Build 103 8.9.3p2/NT-8.9.3) with ESMTP id KAA03061 for ; Fri, 12 Sep 2003 10:42:55 -0700 Received: by mail.canfor.ca with Internet Mail Service (5.5.2653.19) id ; Fri, 12 Sep 2003 10:42:55 -0700 Message-ID: <1F17B59A61D4194095359264D24D22A2708BFD@mailman.canfor.ca> From: "Bartrim, Todd" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: turbo wastegate requirements Date: Fri, 12 Sep 2003 10:42:53 -0700 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C37955.4AD68660" 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. ------_=_NextPart_001_01C37955.4AD68660 Content-Type: text/plain > What would enlarging the wastegate involve? Probably a MAJOR mod for > little benefit. Hi Jim; I have a series IV turbo which had a laughably small wastegate. I was shocked to see the port was about the size of a dime and bored straight through. The "gate" is about the size of a dollar coin (a Loonie for us Canucks:-), so I enlarged this port to within 1mm of the gate circumference. I also ported the inside (upstream) edges of the port as well to provide a better flow path. It wasn't really that hard to do, taking a little more than an hour and it doubled the area of the port. As I never ran the engine before doing this I can't really say that I can tell a difference, and since I've also not run with full boost for extended periods (yet), I also can't say if it will prevent boost creep, but it certainly couldn't hurt. S. Todd Bartrim Turbo 13B RX-9endurance C-FSTB http://www3.telus.net/haywire/RV-9/C-FSTB.htm "Imagination is more important than knowledge" -Albert Einstein ------_=_NextPart_001_01C37955.4AD68660 Content-Type: text/html Content-Transfer-Encoding: quoted-printable RE: [FlyRotary] Re: turbo wastegate requirements

    What would enlarging the = wastegate involve?  Probably a MAJOR mod for little = benefit.

Hi Jim;
        I have a series IV turbo which had a laughably small = wastegate. I was shocked to see the port was about the size of a dime = and bored straight through. The "gate" is about the size of a = dollar coin (a Loonie for us Canucks:-), so I enlarged this port to = within 1mm of the gate circumference. I also ported the inside = (upstream) edges of the port as well to provide a better flow path. It = wasn't really that hard to do, taking a little more than an hour and it = doubled the area of the port.

        As I never ran the engine before doing this I can't = really say that I can tell a difference, and since I've also not run = with full boost for extended periods (yet), I also can't say if it will = prevent boost creep, but it certainly couldn't hurt.

S. Todd Bartrim
Turbo 13B
RX-9endurance
C-FSTB
http://www3.telus.net/haywire/RV-9/C-FSTB.htm

        "Imagination is more important than = knowledge"
        =         =         =         =         -Albert Einstein

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