X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-iy0-f180.google.com ([209.85.210.180] verified) by logan.com (CommuniGate Pro SMTP 5.4.2) with ESMTPS id 5190851 for flyrotary@lancaironline.net; Mon, 07 Nov 2011 18:42:50 -0500 Received-SPF: pass receiver=logan.com; client-ip=209.85.210.180; envelope-from=fluffysheap@gmail.com Received: by iagz35 with SMTP id z35so9327440iag.25 for ; Mon, 07 Nov 2011 15:42:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=VWfuEhIThZxN3J5FgJ0sNdG6g83h9JsOBo6mxj+Prpk=; b=f2rHaN+mONG1ceBckuyrXshCQCQ7AJ1QfuQFGY8joMzkPFtjWm2KsYCFw7W/DvF2t/ zq40HPSeWG1EBexVaLHh/RHrFbMV/n94zy39qnRd6iff5Qs1fM9RxxCXuHzfhVWDLMuy kZt2XQiKwYsdpG64MlEJC42nC6L/gelH/gy2A= MIME-Version: 1.0 Received: by 10.231.63.209 with SMTP id c17mr5891073ibi.65.1320709335344; Mon, 07 Nov 2011 15:42:15 -0800 (PST) Received: by 10.231.34.9 with HTTP; Mon, 7 Nov 2011 15:42:15 -0800 (PST) In-Reply-To: References: Date: Mon, 7 Nov 2011 16:42:15 -0700 Message-ID: Subject: Re: [FlyRotary] Re: Where's the Buttons? From: William Wilson To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=000e0cd5712cc8e58a04b12d9a59 --000e0cd5712cc8e58a04b12d9a59 Content-Type: text/plain; charset=ISO-8859-1 Although I hate to disagree with Lynn, I would not recommend willy-nilly use of 3MM apex seals, especially in a non-turbo engine. 3MM ceramic seals have excellent detonation resistance valuable in a turbo engine, but regular 3MM seals are only slightly stronger than the 2MM. However, the 3MM seals supposedly do not seal as well at high RPM (I don't have any real evidence of that, but I've heard it from several trusted sources) and tend to chatter more, increasing wear on both the seals and the rotor housings. Mazda switched from 3MM to 2MM seals because the 2MM seals were better overall. The strength of the seal is just barely relevant in a non-turbo engine. Since aircraft engines spend almost all their time at high RPM, the 3MM seals are particularly disadvantaged (and chatter wear is evident in most disassembled aircraft application rotaries). On Mon, Nov 7, 2011 at 4:31 PM, wrote: > ** > That is correct. As far as I know. > > But I never had to use any 2MM slot rotors, so I have not tried to find > solids for them. I think Racing Beat and Mazda Trix will gleefully slot > used 2MM rotors to 3MM. A good way to save some used rotors (with bad > slots). 3MM apex seals are 1/3 stronger than 2MM seals. > Lynn E. Hanover > > In a message dated 11/7/2011 7:37:51 P.M. Paraguay Daylight Time, > keltro@att.net writes: > > Lynn, > Probably I have not looked deep enough but the only solid corner seals > I found at "Mazdatrix" > were for early 12A/13B engines with 3mm apex seals.......... > > --000e0cd5712cc8e58a04b12d9a59 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Although I hate to disagree with Lynn, I would not recommend willy-nilly us= e of 3MM apex seals, especially in a non-turbo engine.=A0 3MM ceramic seals= have excellent detonation resistance valuable in a turbo engine, but regul= ar 3MM seals are only slightly stronger than the 2MM.=A0 However, the 3MM s= eals supposedly do not seal as well at high RPM (I don't have any real = evidence of that, but I've heard it from several trusted sources) and t= end to chatter more, increasing wear on both the seals and the rotor housin= gs.=A0 Mazda switched from 3MM to 2MM seals because the 2MM seals were bett= er overall.=A0 The strength of the seal is just barely relevant in a non-tu= rbo engine.=A0 Since aircraft engines spend almost all their time at high R= PM, the 3MM seals are particularly disadvantaged (and chatter wear is evide= nt in most disassembled aircraft application rotaries).

On Mon, Nov 7, 2011 at 4:31 PM, <Lehanover@aol.com>= wrote:
That is correct. As far as I know.
=A0
But I never had to use any 2MM slot rotors, so I have not tried to fin= d=20 solids for them.=A0 I think Racing Beat and Mazda Trix will gleefully slot= =20 used 2MM rotors to 3MM. A good way to save some used rotors (with bad slots= ).=20 3MM apex seals are 1/3 stronger than 2MM seals.=A0
Lynn E. Hanover
=A0
In a message dated 11/7/2011 7:37:51 P.M. Paraguay Daylight Time,=20 keltro@att.net writ= es:
Lynn,
=A0=A0 Probably I=20 have not looked deep enough but the only solid=20 corner seals I found at "Mazdatrix"
were for early 12A/13B=20 engines with 3mm apex=20 seals..........

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