X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 50 [XX] (67%) RECEIVED: IP not found on home country list (33%) BODY: contains text similar to "no experience" Return-Path: Received: from mail12.syd.optusnet.com.au ([211.29.132.193] verified) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTPS id 2066044 for flyrotary@lancaironline.net; Thu, 24 May 2007 18:20:38 -0400 Received-SPF: none receiver=logan.com; client-ip=211.29.132.193; envelope-from=lendich@optusnet.com.au Received: from george (d211-29-188-186.dsl.nsw.optusnet.com.au [211.29.188.186]) by mail12.syd.optusnet.com.au (8.13.1/8.13.1) with SMTP id l4OMJsAD027477 for ; Fri, 25 May 2007 08:19:56 +1000 Message-ID: <004001c79e51$a92b8650$babc1dd3@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: 2-cycle oil mix Date: Fri, 25 May 2007 08:19:55 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_003D_01C79EA5.79EDF9A0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Antivirus: avast! (VPS 0657-0, 12/12/2006), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_003D_01C79EA5.79EDF9A0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I have no experience outside of synthetics since the 80s. I never had an = apex seal failure. But, I never built an engine with the metal apex seals. The early apex = seals were all one piece carbon 9MM seals. When Mazda went to 2 piece = 3MM metal seals we machined down stock carbon seals and raced on them. = Everyone said that the metal seals would groove the rotor housings if = raced, so I just did what other people were doing at the time.=20 Modern Mazda 2 piece 3MM seals are raced every day and do not damage = the rotor housings at all. You can do it by over reving the engine, and = the chrome will wear out at 150 thousand miles, but you have to work at = it. So that problem should not be a factor. And that is running sump oil = through the apex seals. Plus the modern seals are a far better product = than the first sets produced by Mazda. Now we run the Mazda racing carbon 3MM one piece seals, and I have a = set of Mazda ceramic seals that I will use some day. They will take = anything you can do to them.=20 The metal seals are fine with sump oil, and should be fine with any = modern 2 cycle oil. The RedLine synthetic 2 cycle oil is the very best = you can use, but the housings are going to outlast your interest in = aviation, so the expense is not justified. Any 2 cycle oil should do = just fine. The feature most important is does it burn clean, and = lubrication is second.=20 At aviation RPM there is no stress on the engine. Mine idle at 2,200 = RPM. The bearings are over twice as big as they need to be. The max HP = is produced above 10,000 RPM, and there is a bunch of stress on the = bearings at those speeds. Typical oil pressures of 115 pounds are used = up there. The rotor sides are shaved down because the crank flexes into = an "S" shape and the rotor tips drag on the irons. Imagine that crank = bending at all. Some people have raced a weekend and forgot to mix in the oil. No = detectable damage.=20 So I never let the car race with out me being there. I just talked a guy in Florida,through care and feeding of an engine I = built two years ago and have not seen since. But I run on as usual. Lynn E. Hanover=20 But always interesting Lynn! George ( down under) -------------------------------------------------------------------------= ----- See what's free at AOL.com. ------=_NextPart_000_003D_01C79EA5.79EDF9A0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

I have no experience outside of synthetics since the 80s. I = never had=20 an apex seal failure.

But, I never built an engine with the metal apex seals. The early = apex=20 seals were all one piece carbon 9MM seals. When Mazda went to 2 piece = 3MM=20 metal seals we machined down stock carbon seals and raced on them. = Everyone=20 said that the metal seals would groove the rotor housings if raced, so = I just=20 did what other people were doing at the time.

Modern Mazda 2 piece 3MM seals are raced every day and do not = damage the=20 rotor housings at all. You can do it by over reving the engine, and = the chrome=20 will wear out at 150 thousand miles, but you have to work at it. So = that=20 problem should not be a factor. And that is running sump oil through = the apex=20 seals. Plus the modern seals are a far better product than the first = sets=20 produced by Mazda.

Now we run the Mazda racing carbon 3MM one piece seals, and I = have a set=20 of Mazda ceramic seals that I will use some day. They will take = anything you=20 can do to them.

The metal seals are fine with sump oil, and should be fine with = any=20 modern 2 cycle oil. The RedLine synthetic 2 cycle oil is the very best = you can=20 use, but the housings are going to outlast your interest in aviation, = so the=20 expense is not justified. Any 2 cycle oil should do just fine. The = feature=20 most important is does it burn clean, and lubrication is second. =

At aviation RPM there is no stress on the engine. Mine idle at = 2,200 RPM.=20 The bearings are over twice as big as they need to be. The max HP is = produced=20 above 10,000 RPM, and there is a bunch of stress on the bearings at = those=20 speeds. Typical oil pressures of 115 pounds are used up there. The = rotor sides=20 are shaved down because the crank flexes into an "S" shape and the = rotor tips=20 drag on the irons. Imagine that crank bending at all.

Some people have raced a weekend and forgot to mix in the oil. No = detectable damage.

So I never let the car race with out me being there.

I just talked a guy in Florida,through care and feeding of an = engine I=20 built two years ago and have not seen since.

But I run on as usual.

Lynn E. Hanover

But always interesting Lynn!

George ( down under)

See what's free at AOL.com.=20

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