Return-Path: Received: from mail28.syd.optusnet.com.au ([211.29.133.169] verified) by logan.com (CommuniGate Pro SMTP 4.3c2) with ESMTP-TLS id 792118 for flyrotary@lancaironline.net; Mon, 14 Mar 2005 01:48:45 -0500 Received-SPF: none receiver=logan.com; client-ip=211.29.133.169; envelope-from=lendich@optusnet.com.au Received: from george (d220-236-121-188.dsl.nsw.optusnet.com.au [220.236.121.188]) by mail28.syd.optusnet.com.au (8.12.11/8.12.11) with SMTP id j2E6ltvI000693 for ; Mon, 14 Mar 2005 17:47:56 +1100 Message-ID: <001e01c52862$28eb4320$bc79ecdc@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: peripheral ports Date: Mon, 14 Mar 2005 16:50:50 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001B_01C528B5.FA1EA0B0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 This is a multi-part message in MIME format. ------=_NextPart_000_001B_01C528B5.FA1EA0B0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Bill supporting your statement - Mazda supplied P-Ported housings. I = can't remember why they did whether it was for competition racing or = such - they idled OK. The secret is to identify that which works best for our needs (AVIATION) = and set it up for that. Overlap causes inlet fuel contamination/ dilution, SURE, but so to do = most engines, which have up to 30 degrees overlap ( if I remember = correctly). In radical cam reciprocating engines, the cam keeps the valves open = longer - hence overlap. Two strokes have overlap. The mixing of gases can be minimized with timing and shape of the ports = and velocity of the incoming gases - this is what Jerry's doing. It would be prudent to wait for his development outcomes. I calculated velocity and timing as did Jerry and he had expert advice, = mine was a bit rudimentary but the outcomes agreed. This is supported by = the Powersport specifications, so I don't see Jerry being too far off = the mark. George ( down under)=20 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 ------=_NextPart_000_001B_01C528B5.FA1EA0B0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Bill supporting your statement - Mazda supplied P-Ported housings. = I can't=20 remember why they did whether it was for competition racing or such - = they idled=20 OK.

The secret is to identify that which works best for our needs = (AVIATION)=20 and set it up for that.

Overlap causes inlet fuel contamination/ dilution, SURE, but = so to do=20 most engines, which have up to 30 degrees overlap ( if I remember=20 correctly).

In radical cam reciprocating engines, the cam keeps the valves open = longer=20 - hence overlap. Two strokes have overlap.

The mixing of gases can be minimized with timing and shape of the = ports and=20 velocity of the incoming gases - this is what Jerry's doing.

It would be prudent to wait for his development = outcomes.

I calculated velocity and timing as did Jerry and he had = expert=20 advice, mine was a bit rudimentary but the outcomes agreed. This is = supported by=20 the Powersport specifications, so I don't see Jerry being too far off = the=20 mark.

George ( down under)

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

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