Return-Path: Received: from imo-d20.mx.aol.com ([205.188.139.136] verified) by logan.com (CommuniGate Pro SMTP 4.3c2) with ESMTP id 792084 for flyrotary@lancaironline.net; Mon, 14 Mar 2005 00:42:35 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.188.139.136; envelope-from=WRJJRS@aol.com Received: from WRJJRS@aol.com by imo-d20.mx.aol.com (mail_out_v37_r3.8.) id q.74.4f7a6d9b (25098) for ; Mon, 14 Mar 2005 00:41:49 -0500 (EST) From: WRJJRS@aol.com Message-ID: <74.4f7a6d9b.2f667e1d@aol.com> Date: Mon, 14 Mar 2005 00:41:49 EST Subject: Re: [FlyRotary] Re: peripheral ports To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1110778909" X-Mailer: 9.0 for Windows sub 5003 -------------------------------1110778909 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit 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, I really would like to know where the idea that the PP rotary won't idle came from? 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. 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. Bill Jepson -------------------------------1110778909 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 3/13/2005 6:29:35 PM Pacific Standard Time, jesse@je= ssfarr.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 che= aper than the other fellow when he didn't have 'em either. I gues= s 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 housin= gs anyway. Oh well, I 'll just stay happy with my junker, as long as it last= s; 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 p= sru gearing, they will not be much good to us; it seems aircraft actually&nb= sp;do have to have an engine that keeps running on/in slow flight, too.

Group,

I really would like to know where the idea that the PP rotary won= 't idle came from?

This is total baloney. Lynn Hanover has commented several times that hi= s PP 12A idles just fine. Some carburated engines with unusual manifold= s sometimes have problems. This is true for both PP and side port engin= es. Many of the earlier rotary engines used P ports.

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 EF= I engine. The throttle plates being close to the housings makes things=20= work better. The MB C111 used various rotary configurations. Most of th= e engines were peripheral ported. There was no problem with idle, but the&nb= sp;sealing problems of that era prevented a production version. If your engi= ne is set up carefully without radical timing idle won't be a pro= blem. The real problems encountered by many people are caused by large ports= and extended port timings.

Bill Jepson

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