Return-Path: Received: from imf19aec.mail.bellsouth.net ([205.152.59.67] verified) by logan.com (CommuniGate Pro SMTP 4.2b7) with ESMTP id 310481 for flyrotary@lancaironline.net; Sat, 10 Jul 2004 11:22:01 -0400 Received: from JSLADE ([209.215.55.59]) by imf19aec.mail.bellsouth.net (InterMail vM.5.01.06.08 201-253-122-130-108-20031117) with ESMTP id <20040710152129.PUPM1775.imf19aec.mail.bellsouth.net@JSLADE> for ; Sat, 10 Jul 2004 11:21:29 -0400 From: "John Slade" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] Turbo Overspeed??? Date: Sat, 10 Jul 2004 11:21:28 -0400 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0028_01C46670.0B5FE220" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 In-Reply-To: Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_0028_01C46670.0B5FE220 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit > Pressure ratio boost creep. Ed, More fascinating reading. Thanks. You might also want consider the air bleed on my intercooler. I thought I'd mentioned this, but your analysis makes it more relevant so I'll mention it again. There is a 1/2 inch outlet on the intercooler which vents to atmosphere. Before getting the BOV I tried blocking it, and found that the boost "went off the scale", so I unblocked it again. It left it unblocked when I got the BOV think this was a "safety" measure. Perhaps it was with respect to the engine & detonation, but not so, I think, with respect to overspeeding the turbo. By the way I was at 11,500 doing 5200rpm when the turbine wheel let go. Oh, and for anyone thinking that this turbo stuff is way too much complexity and trouble, let me point out that the 13B with 9PSI of boost at only 4000 rpm is a truely powerful beast and well worth the effort. (especially now I have the injectors wired correctly and the mixture right). Sitting at 11k ft its VERY nice to add a couple of inches of map and see an instant 1000 fpm, and if I can get the rpm up a bit more at sea level with the new turbo I'm going to need a G suit for take off. :) Regards, John JTD? (Johns Turbo Demise). Is this what fame feels like??? ------=_NextPart_000_0028_01C46670.0B5FE220 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

> Pressure ratio boost = creep.

Ed,

More fascinating reading.=20 Thanks.

You might also want consider the air bleed on my = intercooler. I=20 thought I'd mentioned this, but your analysis makes it more relevant so = I'll=20 mention it again. There is a 1/2 inch outlet on the intercooler which = vents to=20 atmosphere. Before getting the BOV I tried blocking it, and found that = the boost=20 "went off the scale", so I unblocked it again. It left it unblocked when = I got=20 the BOV think this was a "safety" measure. Perhaps it was with respect = to the=20 engine & detonation, but not so, I think, with respect to = overspeeding the=20 turbo. By the way I was at 11,500 doing 5200rpm when the turbine = wheel let=20 go.

Oh, and for anyone thinking that this turbo = stuff is=20 way too much complexity and trouble, let me point out that the 13B with = 9PSI of=20 boost at only 4000 rpm is a truely powerful beast and well worth the = effort.=20 (especially now I have the injectors wired correctly and the mixture=20 right). Sitting at 11k ft its VERY nice to add a couple of inches = of map=20 and see an instant 1000 fpm, and if I can get the rpm up a bit more at = sea level=20 with the new turbo I'm going to need a G suit for take off.=20 :)

Regards,

John=20

JTD? (Johns Turbo Demise). Is this what fame feels=20 like???

------=_NextPart_000_0028_01C46670.0B5FE220--