Return-Path: Received: from imf21aec.mail.bellsouth.net ([205.152.59.69] verified) by logan.com (CommuniGate Pro SMTP 4.3c2) with ESMTP id 792294 for flyrotary@lancaironline.net; Mon, 14 Mar 2005 08:03:30 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.69; envelope-from=sqpilot@bellsouth.net Received: from paul52u7f5qyav ([209.214.44.222]) by imf21aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with SMTP id <20050314130242.QRXV20331.imf21aec.mail.bellsouth.net@paul52u7f5qyav> for ; Mon, 14 Mar 2005 08:02:42 -0500 Message-ID: <005601c52896$16cc9980$de2cd6d1@paul52u7f5qyav> From: "Paul" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: peripheral ports Date: Mon, 14 Mar 2005 07:02:32 -0600 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0053_01C52863.CB5473B0" 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 This is a multi-part message in MIME format. ------=_NextPart_000_0053_01C52863.CB5473B0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable ----- Original Message -----=20 From: WRJJRS@aol.com=20 To: Rotary motors in aircraft=20 Sent: Sunday, March 13, 2005 11:41 PM Subject: [FlyRotary] Re: peripheral ports In a message dated 3/13/2005 6:29:35 PM Pacific Standard Time, = jesse@jessfarr.com writes: Years ago, I was buying something from some feller and he was kind = of high. When I asked for a little better deal and said I was used to = buying 'em from this other fellow for a lot less but he was out; he told = me real quick like that he could even sell 'em cheaper than the other = fellow when he didn't have 'em either. I guess price is not something = to even gripe about if you can't get 'em. And, I will admit that the = price might not seem too bad when/if you need housings anyway. Oh well, = I 'll just stay happy with my junker, as long as it lasts; then I can = worry about some of that kind of stuff. But, let's face it, if the pp = engines don't keep running at low rpms and/or idle well, even though = their high rpms can be right down our aircraft use alley with proper = psru gearing, they will not be much good to us; it seems aircraft = actually do have to have an engine that keeps running on/in slow flight, = too. Group,=20 I really would like to know where the idea that the PP rotary won't = idle came from?=20 This is total baloney. Lynn Hanover has commented several times that = his PP 12A idles just fine. Some carburated engines with unusual = manifolds sometimes have problems. This is true for both PP and side = port engines. Many of the earlier rotary engines used P ports.=20 If and engine is radically ported in either port type, (just like a = radically cammed piston engine), it can be difficult to make idle. If = you keep the port timing reasonable the engine ?WILL IDLE FINE, = especially a EFI engine. The throttle plates being close to the housings = makes things work better. The MB C111 used various rotary = configurations. Most of the engines were peripheral ported. There was no = problem with idle, but the sealing problems of that era prevented a = production version. If your engine is set up carefully without radical = timing idle won't be a problem. The real problems encountered by many = people are caused by large ports and extended port timings.=20 Bill Jepson Hi, Bill....I got the idea that p-ported engines would not idle well = from Mazda Racing, Mazdatrix, and 5 or 6 other shops that will p-port an = engine. One example of other articles referring to the poor idle can be = seen at www.monito.com/wankel/porting.html . I am not making this = up....just passing on what I have read from what I thought to be = reputable dealers. Paul Conner=20 -------------------------------------------------------------------------= ----- No virus found in this incoming message. Checked by AVG Anti-Virus. Version: 7.0.308 / Virus Database: 266.7.2 - Release Date: 3/11/2005 ------=_NextPart_000_0053_01C52863.CB5473B0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 
----- Original Message -----
From:=20 WRJJRS@aol.com
Sent: Sunday, March 13, 2005 = 11:41=20 PM
Subject: [FlyRotary] Re: = peripheral=20 ports

In a message dated 3/13/2005 6:29:35 PM Pacific Standard Time, jesse@jessfarr.com = writes:
Years ago, I was buying something = from some=20 feller and he was kind of high.  When I asked for a little = better deal=20 and said I was used to buying 'em from this other fellow for a lot = less but=20 he was out; he told me real quick like that he could even sell = 'em=20 cheaper than the other fellow when he didn't have 'em = either.  I=20 guess price is not something to even gripe about if you can't get = 'em. =20 And, I will admit that the price might not seem too bad when/if you = need=20 housings anyway. Oh well, I 'll just stay happy with my junker, as = long as=20 it lasts; then I can worry about some of that kind of stuff. But, = let's face=20 it, if the pp engines don't keep running at low rpms and/or idle = well, even=20 though their high rpms can be right down our aircraft use alley = with=20 proper psru gearing, they will not be much good to us; it seems = aircraft=20 actually do have to have an engine that keeps running on/in = slow=20 flight, too.
 Group,
 I really would like to know where the idea that the PP = rotary won't=20 idle came from? 
This is total baloney. Lynn Hanover has commented several times = that=20 his PP 12A idles just fine. Some carburated engines with unusual=20 manifolds sometimes have problems. This is true for both PP and = side port=20 engines. Many of the earlier rotary engines used P ports.
 If and engine is radically ported in either port type, = (just like a=20 radically cammed piston engine), it can be difficult to make idle. If = you keep=20 the port timing reasonable the engine ?WILL IDLE FINE, especially a = EFI=20 engine. The throttle plates being close to the housings makes = things work=20 better. The MB C111 used various rotary configurations. Most of = the=20 engines were peripheral ported. There was no problem with idle, but=20 the sealing problems of that era prevented a production version. = If your=20 engine is set up carefully without radical timing idle won't =  be a=20 problem. The real problems encountered by many people are caused by = large=20 ports and extended port timings.
Bill Jepson
 
Hi, Bill....I got the idea that p-ported engines would not idle = well from=20 Mazda Racing, Mazdatrix, and 5 or 6 other shops that will p-port an = engine.=20 One example of other articles referring to the poor idle can be seen = at www.monito.com/wankel/= porting.html . =20 I am not making this up....just passing on what I have read from what = I=20 thought to be reputable dealers.  Paul Conner 

No virus found in this incoming message.
Checked by AVG=20 Anti-Virus.
Version: 7.0.308 / Virus Database: 266.7.2 - Release = Date:=20 3/11/2005
------=_NextPart_000_0053_01C52863.CB5473B0--