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 5189447 for flyrotary@lancaironline.net; Sun, 06 Nov 2011 22:23:28 -0500 Received-SPF: pass receiver=logan.com; client-ip=209.85.210.180; envelope-from=wdleonard@gmail.com Received: by iagz35 with SMTP id z35so6755350iag.25 for ; Sun, 06 Nov 2011 19:22:53 -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=95gvV8FaHvU7Jsy8mEMn3Xzbbsa+3OEMuFW+pBdrty4=; b=wU3Z4zyI/skREu0dL4GeB3ULcnRyU7mv8mftfaVLpa4gOBTixfqYsdDmSxLqN76KMQ wSduQxdi0FqEUDwJNDy+G5RCqnzZAWa2KFcLhmKMdK1nj6K3AoZIXxxxVxAc/zi7DSR/ dH0oG+dECkBsWFc9nrIEeNzpnZF11KDlw4x+Y= MIME-Version: 1.0 Received: by 10.231.45.9 with SMTP id c9mr9749406ibf.73.1320636172853; Sun, 06 Nov 2011 19:22:52 -0800 (PST) Received: by 10.231.47.197 with HTTP; Sun, 6 Nov 2011 19:22:52 -0800 (PST) In-Reply-To: References: Date: Sun, 6 Nov 2011 19:22:52 -0800 Message-ID: Subject: Re: [FlyRotary] Re: Where's the Buttons? From: David Leonard To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=00151773e0e4f5e26204b11c9195 --00151773e0e4f5e26204b11c9195 Content-Type: text/plain; charset=ISO-8859-1 Great post as always Lynn, Thanks! Dave Leonard On Sat, Nov 5, 2011 at 11:10 PM, wrote: > ** > The rubber plugs vanish if you operate at high power settings for very > long. They just barely last in a street engine. Some usually gone on each > tear down. That is not the problem. The > plug style corner seal is not very strong. All are powdered metal and > under great stress, like a detonation event will crack. I have never found > a stock solid seal broken. I have found the plug style broken many times. > Just order the early solid corner seal. Not an after market solid seal. > Mazda makes the best pieces in most cases. > > Chatter marks are from warn apex seal grooves, low spring pressure, > overheated apex seals, low or no apex seal lubrication. > > Failed compression "O" rings have been over heated. I have never used an > aftermarket "O" ring but as an emergency for a one weekend engine I have > used Teflon or Kapton insulated 18 gage aircraft electrical wire as an "O" > ring along with a very small bead of silicone in the groove. > > It is nearly impossible to get the water "O" ring to fail. (the outer > black one). > > Ran that engine all year since it was not leaking at all. I always use the > stock "O" rings, and even reuse them many times. 99% of the sealing is just > the clamping forces between the housing and the iron. > > Racing Beat says to use 32 pounds of torque on the case bolts in boosted > engines. Also no split timing, and not more than 12 degrees of advance in > ignition timing. I would suggest over-rich mixtures for racing and full > throttle climb out from low altitudes. Keeps things much cooler. More apex > seal lubrication (if premixing). And even with Richards top oil adaptor I > would premix just a bit more oil. The distribution is just much better in a > premix. > > On street ported engines never turn them backwards unless you know that > the builder radiused the bottom of the port to pick up the drooping > trailing end of the side seals. > > Lynn E. Hanover > > > > In a message dated 11/5/2011 1:14:51 P.M. Paraguay Daylight Time, > keltro@att.net writes: > > Concerning the corner seal rubber buttons it seems that they end up > reverting back to carbon and > lose all elasticity (particularity under high heat) and become uselessfor their original purpose which > was to give slightly increased compression at starter speeds...........I > personally will use the solid > racing corner seals available from Mazda and other > sources.................IMHO > > -- David Leonard Turbo Rotary RV-6 N4VY http://N4VY.RotaryRoster.net http://RotaryRoster.net --00151773e0e4f5e26204b11c9195 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Great post as always Lynn, Thanks!
=A0
Dave Leonard

On Sat, Nov 5, 2011 at 11:10 PM, <Lehanover@aol.com> wrote:
The rubber plugs vanish if you operate at high power settings for very= long. They just barely last in a street engine. Some usually gone on each = tear down. That is not the problem. The
plug style corner seal is not very strong. All are powdered metal and = under great stress, like a detonation event will crack. I have never found = a stock solid seal broken. I have found the plug style broken many times. J= ust order the early solid corner seal. Not an after market solid seal. Mazd= a makes the best pieces in most cases.
=A0
Chatter marks are from warn apex seal grooves, low spring pressure, ov= erheated apex seals, low or no apex seal lubrication.
=A0
Failed compression "O" rings have been over heated. I have n= ever used an aftermarket "O" ring but as an emergency for a one w= eekend engine I have used Teflon or Kapton insulated 18 gage aircraft elect= rical wire as an "O" ring along with a very small bead of silicon= e in the groove.
=A0
It is nearly impossible to get the water "O" ring to fail. (= the outer black one).
=A0
Ran that engine all year since it was not leaking at all. I always use= the stock "O" rings, and even reuse them many times. 99% of the = sealing is just the clamping forces between the housing and the iron.
=A0
=A0Racing Beat says to use 32 pounds of torque on the case bolts in bo= osted engines. Also no split timing, and not more than 12 degrees of advanc= e in ignition timing. I would suggest over-rich mixtures for racing and ful= l throttle climb out from low altitudes. Keeps things much cooler. More ape= x seal lubrication (if premixing). And even with Richards top oil adaptor I= would premix just a bit more oil. The distribution is just much better in = a premix.
=A0
On street ported engines never turn them backwards unless you know tha= t the builder radiused the bottom of the port to pick up the drooping trail= ing end of the side seals.
=A0
Lynn E. Hanover
=A0
=A0
=A0
In a message dated 11/5/2011 1:14:51 P.M. Paraguay Daylight Time, keltro@att.net writes:<= /div>
=A0Concerning the corner seal rubber buttons it seems that they = end up reverting back to carbon and
lose all elasticity (parti= cularity under high heat) and become useless for their original purpose which=A0
was to give slightly increased compression at starter speeds....= .......I personally will use the solid
racing corner seals available from=A0Mazda and other sources....= .............IMHO=A0



--
David Leonard
Turbo Rotary RV-6 N4VY
http://N= 4VY.RotaryRoster.net
http://Rota= ryRoster.net
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