Return-Path: <13brv3@bellsouth.net> Received: from imf23aec.mail.bellsouth.net ([205.152.59.71] verified) by logan.com (CommuniGate Pro SMTP 4.2b3) with ESMTP id 3230377 for flyrotary@lancaironline.net; Thu, 13 May 2004 09:51:07 -0400 Received: from rad ([65.6.194.9]) by imf23aec.mail.bellsouth.net (InterMail vM.5.01.06.08 201-253-122-130-108-20031117) with ESMTP id <20040513135107.QOBU11640.imf23aec.mail.bellsouth.net@rad> for ; Thu, 13 May 2004 09:51:07 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Detonated! :-( Date: Thu, 13 May 2004 08:51:01 -0500 Message-ID: <005a01c438f1$591f3df0$6001a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_005B_01C438C7.704935F0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_005B_01C438C7.704935F0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable I wonder if Rusty got one of them girl hockey players to shove a puck up = my tail-pipe.. would that do it? I probably deserve it for reposting them = pics. =20 I specifically told them to shove it up your tail-pipe, not the plane's = :-) For the record, I'm not mad at you for the pics. =20 I'm glad there was a safe ending to the story, which was well written = BTW. I'd love to know what the actual boost was. With enough fuel, and a = little less timing advance, you can survive a reasonable amount of boost, but = there are limits, particularly with higher compression rotors.=20 =20 As you know, lack of boost control is one of the reasons I don't = consider the stock turbo suitable for our applications. It was made to boost at = low rpms, to help with street applications, which means it overboosts in our application. The internal wastegate (even ported) can't dump enough = exhaust to control the boost at full throttle. For example, John's new turbo = (when it was on my plane) would exceed 10 psi (50 MAP) with the wastegate = manually held wide open. This was at static rpms near 5000, so you can imagine = what the boost would be at 6500. You're muffler will add a tiny amount of backpressure, which will help control the boost, but I doubt it's = enough. =20 =20 Now that you're doing a rebuild, have you considered installing 8.5 cr rotors? I have a set that came out of my new "generator" engine, so = they only have the Mazda test run time on them. I've been meaning to put = them on Ebay, but if you want to install them, they're yours for the price of postage. Also, why not consider an aftermarket turbo that's sized more appropriately? I know this would be expensive, and a pain to install, = but consider how expensive and inconvenient an off airport landing could be. = =20 =20 FWIW, I'm not completely against turbos, and have recently been missing = the power I used to have. If this new manifold business doesn't work out, I just might think about turbos again, but it won't be a stock Mazda = turbo. =20 =20 Cheers, Rusty (still in search of performance) ------=_NextPart_000_005B_01C438C7.704935F0 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Message
I = wonder if Rusty=20 got one of them girl hockey players to shove a puck up my tail-pipe.. = would that=20 do it? I probably deserve it for reposting them = pics.
   
I = specifically told them=20 to shove it up your tail-pipe, not the plane's :-)   For = the=20 record, I'm not mad at you for the = pics.
 
I'm glad = there was a=20 safe ending to the story, which was well written BTW.  I'd love to = know=20 what the actual boost was.  With enough fuel, and a little less = timing=20 advance, you can survive a reasonable amount of boost, but there are = limits,=20 particularly with higher compression=20 rotors. 
 
As you = know, lack of=20 boost control is one of the reasons I don't consider the stock turbo = suitable=20 for our applications.  It was made to boost at low rpms, to help = with=20 street applications, which means it overboosts in our application.  = The=20 internal wastegate (even ported) can't dump enough exhaust to control = the boost=20 at full throttle.  For example, John's new turbo (when it was on my = plane)=20 would exceed 10 psi (50 MAP) with the wastegate manually held wide = open. =20 This was at static rpms near 5000, so you can imagine what the boost = would=20 be at 6500.   You're muffler will add a tiny amount of=20 backpressure, which will help control the boost, but I doubt=20 it's enough. 
 
Now that = you're doing a=20 rebuild, have you considered installing 8.5 cr rotors?  I have a = set that=20 came out of my new "generator" engine,  so they only have the Mazda = test=20 run time on them.  I've been meaning to put them on Ebay, but if = you want=20 to install them, they're yours for the price of postage.  Also, why = not=20 consider an aftermarket turbo that's sized more appropriately?  I = know this=20 would be expensive, and a pain to install, but consider how expensive = and=20 inconvenient an off airport landing could be. =20
 
FWIW, I'm = not completely=20 against turbos, and have recently been missing the power I used to=20 have.  If this new manifold business doesn't work out, I just might = think=20 about turbos again, but it won't be a stock Mazda turbo. =20
 
Cheers,
Rusty = (still in search=20 of performance)
------=_NextPart_000_005B_01C438C7.704935F0--