X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [24.25.9.101] (HELO ms-smtp-02-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.3c5) with ESMTP id 910795 for flyrotary@lancaironline.net; Thu, 21 Apr 2005 20:36:05 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.101; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-185-127.carolina.res.rr.com [24.74.185.127]) by ms-smtp-02-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id j3M0ZH0W003399 for ; Thu, 21 Apr 2005 20:35:18 -0400 (EDT) Message-ID: <002501c546d3$2bdc0350$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Apex Groove Specs was Re: Apex Seal Groove Wear Date: Thu, 21 Apr 2005 20:35:23 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0022_01C546B1.A4854400" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0022_01C546B1.A4854400 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Wendell, According to the Mazda, the spec limits range for clearance between apex = seal and slot side is 0.062 to 0.102mm as the standard. They give the = limit spec as 0.15mm. Chapter 2 Part B of the Haynes 1989-1991 Rx-7 = (page 73). Ed ----- Original Message -----=20 From: Wendell Voto=20 To: Rotary motors in aircraft=20 Sent: Thursday, April 21, 2005 6:54 PM Subject: [FlyRotary] Re: Apex Seal Groove Wear With all the chatter about apex seal slot wear, thought I'd better = check my old engine. Could not get a .1mm gage in the slots beside the = apex seal, I think a .08mm would go in. Assume this is OK. Got my injectors cleared and spraying a good pattern, didn't know that = they sprayed with such a force. Rusty, looks like I won't be needing = your injectors after all. Wendell Hi! Kelly I must of mist Lynn's VST system, I don't understand what = those measurements are. I opened another 91 13b NA today & to my dismay = it was toast (supposably a Mazda rebuilt in '99) I measured at 90deg. to the apex slots with a digital vernier = caliper the reading I got on this one were from 2.26 to 2.43 mm the new = 2mm seal is 1.91 to 1.94 wide, the max allowable clearance is 0.1mm = therefore in this case the widest width should be 1.04mm so this slot = has 0.39 mm excess wear at the slot opening. Has anyone actually = measured a new rotor? I guess I will buy 2 new rotors now Georges=20 =20 Hi! Leon You have a point regarding air filter use on water, when = Mt St Helen (Washington state) erupted the first time I had a shop in = Vancouver BC Canada (about 300miles away) even at that distance, one of = the fleets of vehicle that we serviced had to have the air filters = replaced every second day( even a week the eruption). I made the crack about no need for an air filter for a = float plane in Canada, but actually much of the time float planes are = started on the lake shores with the engine above the ground instead of = the water. The other thing about air filters on an airplane, an = alternate air source (like a slightly spring loaded flat) should be = supplied ( in a float plane case , water could splash onto the element & = freeze solid at altitude, blocking air to the intake). On the rotor apex = seal subject, I agree with you regarding the amount of wear on the rotor = seal slot & seal has to be a lot more than Ed's to spit out the seals. = I drove my used engine supplier nuts yesterday, measured 6 different = rotors & all were from 2.13 to 2.28 mm, he old me they use these rotors = regularly for a long time & never had a problem. Mine are 2.17 to = 2.26mm, So I guess I'l have to buy new rotors. Georges Boucher =20 =20 =20 =20 =20 =20 -------------------------------------------------------------------------= --- -------------------------------------------------------------------------= --- ------=_NextPart_000_0022_01C546B1.A4854400 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Wendell,
 
According to the Mazda, the spec limits range for = clearance=20 between apex seal and slot side  is 0.062 to 0.102mm  as the=20 standard.  They give the limit spec as 0.15mm.  Chapter 2 Part = B of=20 the Haynes 1989-1991 Rx-7 (page 73).
 
Ed
----- Original Message -----
From:=20 Wendell = Voto=20
Sent: Thursday, April 21, 2005 = 6:54=20 PM
Subject: [FlyRotary] Re: Apex = Seal Groove=20 Wear

With all = the chatter=20 about apex seal slot wear, thought I'd better check my old = engine.  Could=20 not get a .1mm gage in the slots beside the apex seal, I think a .08mm = would=20 go in.  Assume this is OK.
 
Got my = injectors=20 cleared and spraying a good pattern, didn't know that they sprayed = with such a=20 force. Rusty, looks like I won't be needing your injectors after=20 all.
 
Wendell
 
 Hi! Kelly
I must of mist Lynn's VST system, I don't understand what = those=20 measurements are.  I opened another 91 13b NA today & = to my=20 dismay it was toast (supposably a Mazda rebuilt in '99)
I measured at 90deg. to the apex slots with a digital = vernier=20 caliper the reading I got on this one were from 2.26 to 2.43 = mm the=20 new 2mm seal is 1.91 to 1.94 wide, the max allowable clearance = is=20 0.1mm therefore in this case the widest width should be 1.04mm = so this=20 slot has 0.39 mm excess wear at the slot opening. Has anyone=20 actually measured a new rotor? I guess I will buy = 2 new=20 rotors now
Georges 
 



 
 Hi! Leon
You have a point regarding air filter use on water, = when Mt=20 St Helen (Washington state) erupted the first time I had = a shop=20 in Vancouver BC Canada (about 300miles away) even at = that=20 distance, one of the fleets of vehicle that we serviced = had to=20 have the air filters replaced every second day( even a = week the=20 eruption).
 I made the crack about no need for an air = filter for=20 a float plane in Canada, but actually much of the time = float=20 planes are started on the lake shores with the engine = above the=20 ground instead of the water. The other thing about air = filters=20 on an airplane, an alternate air source (like a slightly = spring=20 loaded flat) should be supplied ( in a float plane case = , water=20 could splash onto the element & freeze solid at = altitude,=20 blocking air to the intake). On the rotor apex seal = subject, I=20 agree with you regarding the amount of wear on the = rotor=20 seal slot & seal has to be a lot more than = Ed's  to=20 spit out the seals. I drove my used engine supplier=20 nuts yesterday, measured 6 different  = rotors =20 & all were from 2.13 to 2.28 mm, he old me they use = these=20 rotors regularly for a long time & never had a = problem. Mine=20 are 2.17 to 2.26mm, So I guess I'l have to buy new = rotors.
Georges Boucher
 
 
 
 

 
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