Return-Path: <13brv3@bellsouth.net> Received: from imf18aec.mail.bellsouth.net ([205.152.59.66] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 523459 for flyrotary@lancaironline.net; Mon, 08 Nov 2004 18:05:24 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.66; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf18aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20041108230453.ZLQL2398.imf18aec.mail.bellsouth.net@rd> for ; Mon, 8 Nov 2004 18:04:53 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Assembled 13B block today... Date: Mon, 8 Nov 2004 17:05:09 -0600 Message-ID: <002b01c4c5e7$64e4f3e0$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_002C_01C4C5B5.1A4A83E0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_002C_01C4C5B5.1A4A83E0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable When I purchased the 3 motors en block, the seller was under the = impression that all were FC's.. however he had not done any teardown and frankly I = am at a loss to determine the difference looking at the external aspect of = the 4 port FC's and FD's...The only clue that jumped out at me was the = corner seal springs, otherwise they looked and felt similar (no scale handly). = =20 Hi Dave, =20 I looked at your picture of the cannibalized engine, and can see enough = to say that it's not an FD. The FD did not use the crank angle sensor that = I see in the picture, and the water pump housing was much different. So, assuming all your engines have very similar looking front covers, I'd = say they're all 2nd gen. =20 =20 Next problem, is figuring out what year the engine is. As you can see = from the chart, there are two listings for 2nd gen turbo engines, and they = used rotors that were different in compression, and weight. If I had to take = a wild guess, I'd say that maybe the second engine you opened up was the = later 89-92 version, which "may" have had the improved corner seal spring. = Again, that's just a SWAG. Here's what you can do though- get access to a = scale that's accurate enough to tell the difference between 9.54 lb, and 10.04 = lb. Finish tearing down the second engine enough to get the rotor out, and = clean it up. Now you can weight that rotor, and the original one from the = first engine. If you're luck, the will weigh the same. =20 =20 Good luck, Rusty (no fair putting your thumb on the scale) =20 ------=_NextPart_000_002C_01C4C5B5.1A4A83E0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
 When I purchased the 3 motors en block, the seller was under = the=20 impression that all were FC's.. however he had not done any teardown and = frankly=20 I am at a loss to determine the difference looking at the external = aspect of the=20 4 port FC's and FD's...The only clue that jumped out at me was the = corner seal=20 springs, otherwise they looked and felt similar (no scale = handly).  
 
  Hi=20 Dave,
 
I looked at=20 your picture of the cannibalized engine, and can see enough to say that = it's not=20 an FD.  The FD did not use the crank angle sensor that I = see in=20 the picture, and the water pump housing was much different.  So, = assuming=20 all your engines have very similar looking front covers, I'd = say=20 they're all 2nd gen.  
 
Next problem,=20 is figuring out what year the engine is.  As you can see from the = chart,=20 there are two listings for 2nd gen turbo engines, and they used rotors = that were=20 different in compression, and weight.  If I had to take a wild = guess, I'd=20 say that maybe the second engine you opened up was the later 89-92 = version,=20 which "may" have had the improved corner seal spring.  Again, = that's just a=20 SWAG.  Here's what you can do though- get access to = a scale=20 that's accurate enough to tell the difference between 9.54 lb, and 10.04 = lb.  Finish tearing down the second engine enough to get the = rotor=20 out, and clean it up.  Now you can weight that rotor, and the = original one=20 from the first engine.  If you're luck, the will weigh=20 the same.  
 
Good=20 luck,
Rusty (no=20 fair putting your thumb on the=20 scale)  
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