X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.122] verified) by logan.com (CommuniGate Pro SMTP 5.2.12) with ESMTP id 3454754 for flyrotary@lancaironline.net; Tue, 27 Jan 2009 08:55:42 -0500 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.122; envelope-from=eanderson@carolina.rr.com Received: from computername ([75.191.186.236]) by cdptpa-omta02.mail.rr.com with ESMTP id <20090127135504.GCYL15744.cdptpa-omta02.mail.rr.com@computername> for ; Tue, 27 Jan 2009 13:55:04 +0000 From: "Ed Anderson" To: "'Rotary motors in aircraft'" Subject: Porting was Re: Frying pan into the fire....Arrgh Date: Tue, 27 Jan 2009 08:55:13 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0030_01C9805C.F7FA6AA0" X-Mailer: Microsoft Office Outlook, Build 11.0.5510 Thread-Index: Acl/yZTlHKZlsY8HSXuqonTLX6Vg/wAu8k/Q In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 Message-Id: <20090127135504.GCYL15744.cdptpa-omta02.mail.rr.com@computername> This is a multi-part message in MIME format. ------=_NextPart_000_0030_01C9805C.F7FA6AA0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Bill, I ported my turbo block using the Racing Beat (MazdaTrix) port template and carbide bit grinder as well as a valve porting sanding kit (you know with all the sandpaper grinding/smoothing burrs). You get the outline of the port on a piece of metal which you then have to cut out (at least you did when I go mine), but it does have two holes in it for alignment using the dowel pins of the rotor housings. Paint the iron side housing with the "blue" machine drawing ink and then use the template to draw the outline of the port. Remove the template and I recommend covering the side plate with a layer or two of duct tape (or something similar) around the area you intend to grind - the carbide bit can make a nasty burr across the face if it gets away from (don't ask me how I know). I experimented with a junk side housing until I felt comfortable. I did this on a 91 turbo block and you do need to exercise some care not to carve into a EGT port that runs close to the intake port in the casting. This porting changed my timing from the stock 32 IO and 50 IC to 25 IO and 60 IC. It made a difference of 200 - 250 + rpm static on my engine, so I considered it well worthwhile. This 91 street ported turbo block turns 6000-6200 static (depending on OAT) swinging a 74x88 prop with a 2.85 gear box. Ed Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com http://www.andersonee.com http://www.dmack.net/mazda/index.html http://www.flyrotary.com/ http://members.cox.net/rogersda/rotary/configs.htm#N494BW _____ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bill Eslick Sent: Monday, January 26, 2009 10:20 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Frying pan into the fire....Arrgh I sure hope somebody comes up with an explanation for coolant in the rotor housings, as I can't find one! I tore down my engine because of that, and could find NO o-ring leaks. If it leaked, it didn't leave any evidence. The system would hold 15 psi pressure for a week or so, but would slowly leak into the rotor housing. Up to temp, it would blow air into the coolant system (equal opportunity leak). Didn't find the coolant leak, but did find about 3/4" of one of the side seals missing. Now I am gathering parts to put it back with '91 rotors (need a rear counterweight), and looking at street porting. Does anyone know if there is value in street porting if 6000 rpm is the highest you will see? Lynn?? Bill Eslick ------=_NextPart_000_0030_01C9805C.F7FA6AA0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Bill, I ported my turbo block using = the Racing Beat (MazdaTrix) port template and carbide bit grinder as well as = a valve porting sanding kit (you know with all the sandpaper grinding/smoothing = burrs).   You get the outline of the port on a piece of metal which you then have = to cut out (at least you did when I go mine), but it does have two holes in it = for alignment using the dowel pins of the rotor housings.  Paint the = iron side housing with  the “blue” machine drawing ink and then = use the template to draw the outline of the port.  =

 

Remove the template and I recommend covering the side plate with a layer or two of duct tape (or something = similar) around the area you intend to grind – the carbide bit can make a = nasty burr across the face if it gets away from (don’t ask me how I know).  I experimented with a junk side housing until I felt comfortable.  I did this on a 91 turbo block and you do need to = exercise some care not to carve into a EGT port that runs close to the intake = port in the casting. 

 

This porting changed my timing from = the stock 32 IO and 50 IC to 25 IO and 60 IC.  It made a difference of = 200 – 250 + rpm static on my engine, so I considered it well worthwhile.  = This 91 street ported turbo block turns 6000-6200 static (depending on OAT) =  swinging a 74x88 prop with a 2.85 gear box.

 

Ed

 

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bill Eslick
Sent: Monday, January 26, = 2009 10:20 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: = Frying pan into the fire....Arrgh

 

I sure hope somebody comes up with an explanation for coolant in = the rotor housings, as I can't find one!  I tore down my engine because = of that, and could find NO o-ring leaks.  If it leaked, it didn't = leave any evidence.  The system would hold 15 psi pressure for a week or so, = but would slowly leak into the rotor housing.  Up to temp, it = would blow air into the coolant system (equal opportunity leak).

Didn't find the coolant leak, but did find about 3/4" of one of the = side seals missing.  Now I am gathering parts to put it back with '91 = rotors (need a rear counterweight), and looking at street porting.  = Does anyone know if there is value in street porting if 6000 rpm is the = highest you will see?   Lynn??

Bill Eslick

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