Return-Path: <13brv3@bellsouth.net> Received: from imf20aec.mail.bellsouth.net ([205.152.59.68] verified) by logan.com (CommuniGate Pro SMTP 4.3c3) with ESMTP id 816353 for flyrotary@lancaironline.net; Tue, 22 Mar 2005 18:38:48 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.68; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf20aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050322233802.PWEX2394.imf20aec.mail.bellsouth.net@rd> for ; Tue, 22 Mar 2005 18:38:02 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] side housing/rotor questions Date: Tue, 22 Mar 2005 17:38:11 -0600 Message-ID: <000001c52f38$3600bfe0$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C52F05.EB68C0E0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C52F05.EB68C0E0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Welcome Jeff, The rotor housings looked great. How does the coolant get into the rotor housings once the engine is pulled?=20 Unless the coolant is poured, or spilled into the ports, it shouldn't be able to get into the rotor housings. If the combustion O-ring was bad, coolant could get from the cooling passages into the rotor housing. = Take a close look at the O-ring grooves on all the side housings. Was it in = both housings, or just one? Was the intake manifold on the engine when you = got it? If not, maybe someone just got careless when they removed it, and managed to dump some coolant in the engine. =20 I remember a month or so ago people talking about newly rebuilt engines doing this. How does that happen? Not exactly. We were talking about coolant in the coolant passages. If this sits long enough, it will rust the cooling passages. It shouldn't = be in the rotor housing though. Is it better to get them surface ground and re-nitrided (loose some o-ring channel depth? Three of the four surfaces are good (can't see ANY wear but I didn't check yet for warpage). The fourth isn't bad but it seems like a micro pitting.=20 Should I do anything with these or put it together and run it this way? It's hard to believe there isn't "any" wear on side housings. Is there = a chance this engine was very new, and had almost no miles on it? Try to clean up the pitted housing with scotchbrite, and see what it looks = like, then perhaps talk to Racing Beat about resurfacing it. They should be = able to advise you on whether it needs to be done. As far as I know, they = don't flame spray the iron housings, but I know they can grind and re-nitride them. I use my rotors (88) will I need to get an 86-88 rear counterweight? Yes. Do I need to change the front counterweight? No. If I change to the higher compression 89-91 NA rotors do I need the = 89-91 NA counterweight? Yes, front and rear. Are all the flex plates the same as I also need to get a starter? The flex plates are the same up to 91. The 3rd gen (93+) flex plate = will not work. =20 Can I get 180hp out of a 6 port NA? Is this reasonable with a 2.85:1 redrive? I would love to get more but is 180 even reasonable? Absolutely reasonable with a decent intake and exhaust Cheers, Rusty (Ed seems to be having some typing problems today) ------=_NextPart_000_0001_01C52F05.EB68C0E0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

Welcome Jeff,

The rotor housings looked great.  How does the = coolant get=20 into
the rotor housings once the engine is pulled? 

Unless the coolant = is poured, or=20 spilled into the ports, it shouldn't be able to get into = the rotor=20 housings.  If the combustion O-ring was bad, coolant could=20 get from the cooling passages into the rotor housing.  Take a = close=20 look at the O-ring grooves on all the side housings.  Was it in = both=20 housings, or just one?  =20 Was the intake manifold on the engine when you got it?  If not, = maybe=20 someone just got careless when they removed it, and managed to dump some = coolant=20 in the engine.   

I remember a month or so
ago people talking about = newly=20 rebuilt engines doing this.  How does
that happen?

Not = exactly.  We=20 were talking about coolant in the coolant passages.  If this sits = long=20 enough, it will rust the cooling passages.  It shouldn't be in the = rotor=20 housing though.

Is it better to get them surface ground and
re-nitrided (loose = some o-ring=20 channel depth?  Three of the four
surfaces are good (can't see = ANY wear=20 but I didn't check yet for
warpage).  The fourth isn't bad but = it seems=20 like a micro pitting. 
Should I do anything with these or put it = together and run it this way?

It's hard to believe = there isn't "any"=20 wear on side housings.  Is there a chance this engine was very new, = and had=20 almost no miles on it?  Try to clean up the pitted housing with=20 scotchbrite, and see what it looks like, then perhaps talk to Racing = Beat about=20 resurfacing it.  They should be able to advise you on whether it = needs to=20 be done.  As far as I know, they don't flame spray the iron = housings, but I=20 know they can grind and re-nitride them.

I use my rotors = (88) will=20 I need to get an 86-88 rear counterweight?

Yes.

 Do I need to change the front counterweight?

No.

If I change to the higher compression 89-91 NA rotors do I need the = 89-91 NA=20 counterweight?

Yes, front and = rear.

Are all the flex plates the same as I also need to get a starter?

The flex plates are the = same up to=20 91.  The 3rd gen (93+) flex plate will not work.  =

Can I=20 get 180hp out of a 6 port NA?  Is this reasonable with a 2.85:1=20 redrive?  I would love to get more but is
180 even = reasonable?

Absolutely = reasonable with a=20 decent intake and exhaust

Cheers,
Rusty (Ed seems to be = having some=20 typing problems today)
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