Sender: <marv@lancaironline.net>
To: lml@lancaironline.net
Date: Sat, 22 Apr 2006 20:04:22 -0400
Message-ID: <redirect-1077049@logan.com>
Received-SPF: none
 receiver=logan.com; client-ip=64.49.254.21; envelope-from=walter@advancedpilot.com
Mime-Version: 1.0 (Apple Message framework v623)
In-Reply-To: <list-1076890@logan.com>
References: <list-1076890@logan.com>
Content-Type: multipart/alternative; boundary=Apple-Mail-2--63014852
From: Walter Atkinson <walter@advancedpilot.com>
Subject: Re: [LML] CHTs


--Apple-Mail-2--63014852
Content-Transfer-Encoding: quoted-printable
Content-Type: text/plain;
	charset=ISO-8859-1;
	format=flowed

OK.  That's not what their Tips Publication says.  Those numbers are=20
quite a bit higher than their more recent publications.

Walter


On Apr 22, 2006, at 4:17 PM, Paul Lipps wrote:

Lycoming Spec # 2283-G for the O-320-D series says "For maximum engine=20=

life, the CHT should not exceed 475F above 75% power and 435F at 75%=20
and below." Kas Thomas, in AIRCRAFT ENGINE OPERATING GUIDE, says=20
"Pilots of so-called high performance aircraft are often squemish about=20=

leaving the ""balls-to-the-wall""=A0for more than a minute or two after=20=

takeoff, when actually there is no legitimate=A0reason to be squemish at=20=

all (unless of course=A0CHT or oil temperature are approaching redline).=20=

In certification testing, engines are required to spend many hours at=20
full power, with CHT and oil temperatures a specified amount above=20
redline."=A0=A0(Emphasis his).=A0Also, " ...cylinders will generally =
last=20
longer if maintained at no more than 435 degrees."=A0I have another=20
source that mentions the range in my posting, but I don't have it here.=20=

When I get it, I will post it.=

--Apple-Mail-2--63014852
Content-Transfer-Encoding: quoted-printable
Content-Type: text/enriched;
	charset=ISO-8859-1

OK.  That's not what their Tips Publication says.  Those numbers are
quite a bit higher than their more recent publications.


Walter


On Apr 22, 2006, at 4:17 PM, Paul Lipps wrote:


<fontfamily><param>Arial</param>Lycoming Spec # 2283-G for the O-320-D
series says "For maximum engine life, the CHT should not exceed 475F
above 75% power and 435F at 75% and below." Kas Thomas, in AIRCRAFT
ENGINE OPERATING GUIDE, says "Pilots of so-called high performance
aircraft are often squemish about leaving the
""balls-to-the-wall""=A0for more than a minute or two after takeoff,
when actually there is no legitimate=A0reason to be squemish at all
(unless of course=A0CHT or oil temperature are approaching redline). In
certification testing, engines are required to spend many hours at
full power, with CHT and oil temperatures a specified amount
<italic>above redline."=A0=A0(Emphasis his).=A0</italic>Also, " =
...cylinders
will generally last longer if maintained at no more than 435
degrees."=A0I have another source that mentions the range in my posting,
but I don't have it here. When I get it, I will post it.</fontfamily>=

--Apple-Mail-2--63014852--