Mailing List flyrotary@lancaironline.net Message #43127
From: George Lendich <lendich@optusnet.com.au>
Subject: Re: [FlyRotary] Re: Ceramic apex seals
Date: Mon, 9 Jun 2008 08:00:17 +1000
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Paul,
I guess one way ( other than visual) would be to put a magnet to it.
George (down under)
----- Original Message -----
Sent: Monday, June 09, 2008 1:42 AM
Subject: [FlyRotary] Re: Ceramic apex seals

Lynn—

                I have a 13B NA which has previously been converted to propane by Rotary International Enterprises (?) and has to be reconverted to mogas/avgas.   It allegedly has 17 hours of runtime on it and also was claimed to have been rebuilt using “ceramic seals”.  When we do a tear down on it for inspection, at the risk of sounding totally naïve, how do we ascertain that it truly does have ceramic seals on it and would you recommend that we simply just go ahead and replace them with more traditional seals regardless?  (Comments from not only you but also anyone else would be greatly appreciated.)

 

Paul Vermillion

(partially completed BD-4)

 

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Lynn Hanover
Sent: Sunday, June 08, 2008 12:46 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Ceramic apex seals

 

 

There are one piece carbon / aluminum seals, not too expensive, great for racing. Good sealing

never hurt the rotor housings. Can handle some boost. Very light and can do monster revs over 10,000 RPM. You have to be a memebr of the Mazda competition program and provide pictures of your race car and finish sheets from a number of events.

 

The very best are ceramic one piece seals. Scary light. Strong enough for high boost. Not affected by engine over temps or detonation. Run with two springs for tracking at scalding high revs and still have less drag than stock or carbon seals. No downside until you try to buy them.

About $330.00 each seal, (you need 6). This is a bolt on 6 HP just from reduced drag. No rotor housing wear. From Mazda comp. and after market vendors. Carbon as well.

 

Lynn E. Hanover 

 

Newbie Question---for the "normal"13B NA engine, how do the ceramic  apex seals compare with the other types of seals you all are using?  (I've rarely ever read anything about their use in this forum.)

 

Paul Vermillion


Internal Virus Database is out-of-date.
Checked by AVG.
Version: 7.5.524 / Virus Database: 269.24.1/1469 - Release Date: 27/05/2008 1:25 PM
Subscribe (FEED) Subscribe (DIGEST) Subscribe (INDEX) Unsubscribe Mail to Listmaster