X-Virus-Scanned: clean according to Sophos on Logan.com
X-PolluStop: No license found, only first 5 messages were scanned
Return-Path: <marv@lancaironline.net>
Sender: <marv@lancaironline.net>
To: lml
Date: Mon, 26 Jun 2006 18:03:59 -0400
Message-ID: <redirect-1207131@logan.com>
X-Original-Return-Path: <walter@advancedpilot.com>
Received: from secure5.liveoakhosting.com ([64.49.254.21] verified)
  by logan.com (CommuniGate Pro SMTP 5.1c.1)
  with ESMTPS id 1206415 for lml@lancaironline.net; Mon, 26 Jun 2006 08:59:12 -0400
Received-SPF: none
 receiver=logan.com; client-ip=64.49.254.21; envelope-from=walter@advancedpilot.com
Received: (qmail 1231 invoked from network); 26 Jun 2006 07:58:26 -0500
Received: from 216-107-97-170.wan.networktel.net (HELO ?10.0.1.4?) (216.107.97.170)
  by rs5.liveoakhosting.com with SMTP; 26 Jun 2006 07:58:26 -0500
Mime-Version: 1.0 (Apple Message framework v624)
In-Reply-To: <list-1206148@logan.com>
References: <list-1206148@logan.com>
Content-Type: multipart/alternative; boundary=Apple-Mail-2--926669226
X-Original-Message-Id: <2b0a148678d9d0f0101203ce1c0b2d63@advancedpilot.com>
From: Walter Atkinson <walter@advancedpilot.com>
Subject: Re: [LML] Straight bore vs choke
X-Original-Date: Mon, 26 Jun 2006 07:58:26 -0500
X-Original-To: "Lancair Mailing List" <lml@lancaironline.net>
X-Mailer: Apple Mail (2.624)


--Apple-Mail-2--926669226
Content-Transfer-Encoding: quoted-printable
Content-Type: text/plain;
	charset=ISO-8859-1;
	format=flowed

If one runs the mixture properly to keep the peak ICP out of the choke=20=

area, having choke in the barrel is a good thing.  If one operates the=20=

mixture in such a manner so as to place the thetaPP too close to TDC,=20
then not having choke could be a way to overcome the error slightly. =20
Having no choke is one way of covering up poor technique.  It is a=20
sub-optimal way to do things IMO.

Walter


On Jun 26, 2006, at 12:24 AM, Tom Gourley wrote:

I recently ran across the website for Chuck Ney Enterpreses=20
(http://www.chuckneyent.com/) and read where he advocates straight=A0bore=20=

cylinders instead of tapered, or choked, cylinders.=A0 I'm assuming the=20=

engine manufacturers have good reasons for designing taper into their=20
cylinders (variable temperature expansion characteristics over the=20
length of the cylinder?) Mr. Ney, on the other hand, claims a vast=20
amount of experience indicating better performance and longevity by=20
boring the cylinders straight.=A0 I know we have some very knowledgeable=20=

engine people on the LML so I'd like to get their take on straight vs=20
choke.
=A0
Tom Gourley
Legacy builder
=A0=

--Apple-Mail-2--926669226
Content-Transfer-Encoding: quoted-printable
Content-Type: text/enriched;
	charset=ISO-8859-1

If one runs the mixture properly to keep the peak ICP out of the choke
area, having choke in the barrel is a good thing.  If one operates the
mixture in such a manner so as to place the thetaPP too close to TDC,
then not having choke could be a way to overcome the error slightly.=20
Having no choke is one way of covering up poor technique.  It is a
sub-optimal way to do things IMO.


Walter



On Jun 26, 2006, at 12:24 AM, Tom Gourley wrote:


<fontfamily><param>Arial</param><smaller>I recently ran across the
website for Chuck Ney Enterpreses
=
(<color><param>0000,0000,EEEE</param>http://www.chuckneyent.com/</color>)
and read where he advocates straight=A0bore cylinders instead of
tapered, or choked, cylinders.=A0 I'm assuming the engine manufacturers
have good reasons for designing taper into their cylinders (variable
temperature expansion characteristics over the length of the
cylinder?) Mr. Ney, on the other hand, claims a vast amount of
experience indicating better performance and longevity by boring the
cylinders straight.=A0 I know we have some very knowledgeable engine
people on the LML so I'd like to get their take on straight vs =
choke.</smaller></fontfamily>

=A0

<fontfamily><param>Arial</param><smaller>Tom =
Gourley</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>Legacy =
builder</smaller></fontfamily>

=A0=

--Apple-Mail-2--926669226--