X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imr-ma04.mx.aol.com ([64.12.206.42] verified) by logan.com (CommuniGate Pro SMTP 5.4c2o) with ESMTP id 4871742 for flyrotary@lancaironline.net; Tue, 15 Feb 2011 19:26:57 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.12.206.42; envelope-from=Lehanover@aol.com Received: from imo-da04.mx.aol.com (imo-da04.mx.aol.com [205.188.169.202]) by imr-ma04.mx.aol.com (8.14.1/8.14.1) with ESMTP id p1G0QFQY004234 for ; Tue, 15 Feb 2011 19:26:15 -0500 Received: from Lehanover@aol.com by imo-da04.mx.aol.com (mail_out_v42.9.) id q.c03.479bc038 (44621) for ; Tue, 15 Feb 2011 19:26:14 -0500 (EST) Received: from magic-d27.mail.aol.com (magic-d27.mail.aol.com [172.19.146.161]) by cia-mc01.mx.aol.com (v129.7) with ESMTP id MAILCIAMC012-ae4d4d5b19a5356; Tue, 15 Feb 2011 19:26:13 -0500 From: Lehanover@aol.com Message-ID: <8e1fe.1c6a1248.3a8c73a5@aol.com> Date: Tue, 15 Feb 2011 19:26:13 EST Subject: Re: [FlyRotary] Re: Ceramic Apex Seals....curiosity REceramin/carbon/steelst To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_8e1fe.1c6a1248.3a8c73a5_boundary" X-Mailer: 9.0 Security Edition for Windows sub 5382 X-AOL-IP: 72.187.199.116 X-Spam-Flag:NO X-AOL-SENDER: Lehanover@aol.com --part1_8e1fe.1c6a1248.3a8c73a5_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 2/15/2011 11:58:49 A.M. Eastern Standard Time, cbarber@texasattorney.net writes: Heck, tearing down my engine seems to be a routine event as of late That was my understanding too....about being nicer to the housings. I was just wondering about what I don't know or what could be expanded on. Like Dave said, minding parameters is the proper course but I would like to have as clear an understanding as possible for my own edification. Ceramics have now come of age in many areas. Any machine shop has tooling in the form of ceramic triangles that clamp into tool holders. It maters not if the work piece is heat treated, or harder than Chinese arithmetic, the ceramic bits go through it like it was butter. The bits are cheap, and discarded if fouled or dulled. Ceramic apex seals are the gold standard of apex seals. No detectible wear on the seals or the housing chrome. In our case for two seasons of racing. Stronger than steel. Oblivious to high temperatures. And for racing, track the housing shape at any RPM, using doubled springs, and even with twice the spring pressure, have less than half the drag of a carbon seal, and far less than stock steel seals. An automatic 5 HP over steel seals. Ceramics are so light that you cannot help but grin when you pick one up. Ceramics do survive detonation events that would put all steel seals in the muffler. But not for long. I have read that RA seals also hold up well. Ceramics are used in nearly all pro racing applications. I sold a used set to another racer for $500.00. They were identical to new seals after two years of service. The down side is cost. And for one piece seals, typical of racing applications, you must be sure you have the minimum end clearance, about .0015". There have been efforts to develop a two piece seal that is less sensitive to length variations, as they run at zero end clearance for much better cold starting. Mazda competition sells racing ceramics, probably Linetties. There are other manufacturers. Here is one. _http://www.nrsrotorsports.com/_ (http://www.nrsrotorsports.com/) Lynn E. Hanover --part1_8e1fe.1c6a1248.3a8c73a5_boundary Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
In a message dated 2/15/2011 11:58:49 A.M. Eastern Standard Time,=20 cbarber@texasattorney.net writes:
Heck,=20 tearing down my engine seems to be a routine event as of late=20 <sigh>

That was my understanding too....about being nicer= to the=20 housings.

I was just wondering about what I don't know or what co= uld be=20 expanded on.

Like Dave said, minding parameters is the proper cou= rse=20 but I would like to have as clear an understanding as possible for my ow= n=20 edification.

 
Ceramics have now come of age in many areas. Any machine shop has too= ling=20 in the form of ceramic triangles that clamp into tool holders. It maters= not if=20 the work piece is heat treated, or harder than Chinese arithmetic, the cer= amic=20 bits go through it like it was butter. The bits are cheap, and discarded= if=20 fouled or dulled.
 
Ceramic apex seals are the gold standard of apex seals. No detectible= wear=20 on the seals or the housing chrome. In our case for two seasons of racing.= =20 Stronger than steel. Oblivious to high temperatures.
And for racing, track the housing shape at any RPM, using doubled spr= ings,=20 and even with twice the spring pressure, have less than half the drag of= a=20 carbon seal, and far less than stock steel seals. An automatic 5 HP over= steel=20 seals. Ceramics are so light that you cannot help but grin when you pick= one up.=20
 
Ceramics do survive detonation events that would put all steel seals= in the=20 muffler. But not for long.
 
I have read that RA seals also hold up well. Ceramics are used in nea= rly=20 all pro racing applications.
 
I sold a used set to another racer for $500.00. They were identi= cal to=20 new seals after two years of service.
 
The down side is cost. And for one piece seals, typical of racing=20 applications, you must be sure you have the minimum end clearance, about= =20 .0015".
 
There have been efforts to develop a two piece seal that is less sens= itive=20 to length variations, as they run at zero end clearance for much better co= ld=20 starting.
 
Mazda competition sells racing ceramics, probably Linetties. There ar= e=20 other manufacturers.
 
Here is one.
 
 
Lynn E. Hanover
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