Today's Message Index:
----------------------
1. 05:57 PM - Re: A-65 rebuild (Tommy Walker)
2. 06:07 PM - Re: Re: A-65 rebuild (Deems Herring)
3. 06:25 PM - Re: Re: A-65 rebuild (Randy L. Thwing)
4. 06:35 PM - Re: Re: A-65 rebuild (Randy L. Thwing)
5. 06:44 PM - Re: Re: A-65 rebuild (Tommy Walker)
Message 1
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| Subject: | Re: A-65 rebuild |
Hi folks and Randy, :)
How can I tell if my cylinders meet the specs for the new cylinders Randy calls
out in his email from a couple of months ago?.... See below.
Thanks!
If you have a O-200 that is used in a certified aircraft, with original
Continental cylinders identified by casting numbers, they are subject to
cylinder head cracking.
O-200's specs call for ignition timing of 28 degrees BTDC and a redline of
2800 rpm. Because of the head cracking problem, there is a three decades
old AD that requires the timing to be retarded to 24 degrees BTDC. This
decreases horsepower in an effort to alleviate the cylinder head cracking.
Is this cracking a result of cylinder head design geometery or the fact that
these cylinders were designed to run on 80 octane fuel which is no longer
available? I can't answer that. I do know that the cylinder head cracking
is real and does occur often.
These same cylinders are used on most the small Continental 4 cylinder
engines as well as the C-145/O-300 six cylinder engines. As the O-200 is
the only one that has the 2800 RPM redline, this AD doesn't apply to the
other engines as they don't turn as fast. Does that mean turning at a lower
RPM won't cause head cracking? That has not been my experience.
--------
Tommy Walker
N8701 - Anniston, AL
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=338943#338943
Message 2
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| Subject: | Re: A-65 rebuild |
Go here: http://150cessna.tripod.com/c150o200ainsp.html
Deems
> Subject: Continental-List: Re: A-65 rebuild
> From: twalker@cableone.net
> Date: Wed=2C 4 May 2011 17:54:01 -0700
> To: continental-list@matronics.com
>
net>
>
> Hi folks and Randy=2C :)
>
> How can I tell if my cylinders meet the specs for the new cylinders Randy
calls out in his email from a couple of months ago?.... See below.
>
> Thanks!
>
>
> If you have a O-200 that is used in a certified aircraft=2C with original
> Continental cylinders identified by casting numbers=2C they are subject t
o
> cylinder head cracking.
>
> O-200's specs call for ignition timing of 28 degrees BTDC and a redline o
f
> 2800 rpm. Because of the head cracking problem=2C there is a three decade
s
> old AD that requires the timing to be retarded to 24 degrees BTDC. This
> decreases horsepower in an effort to alleviate the cylinder head cracking
.
>
> Is this cracking a result of cylinder head design geometery or the fact t
hat
> these cylinders were designed to run on 80 octane fuel which is no longer
> available? I can't answer that. I do know that the cylinder head cracking
> is real and does occur often.
>
> These same cylinders are used on most the small Continental 4 cylinder
> engines as well as the C-145/O-300 six cylinder engines. As the O-200 is
> the only one that has the 2800 RPM redline=2C this AD doesn't apply to th
e
> other engines as they don't turn as fast. Does that mean turning at a low
er
> RPM won't cause head cracking? That has not been my experience.
>
> --------
> Tommy Walker
> N8701 - Anniston=2C AL
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=338943#338943
>
>
>
>
>
>
>
===========
===========
===========
===========
>
>
>
Message 3
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| Subject: | Re: A-65 rebuild |
Do not archive
I have to offer a slight correction to my original post.
I am typing this with the Continental manual open in front of me on my desk.
The O-200 max rpm is 2750 rather than the 2800 I originally stated.
This is stated on page 3, table V; speed and power ratings. The O-200-A is
listed as 2750 rpm as takeoff rpm (max 1 minute)
Will try to find the AD that requires retarding the timing to 24 degress
BTDC which mentions cylinder casting numbers.
Randy, Las Vegas
----- Original Message -----
From: "Tommy Walker" <twalker@cableone.net>
Sent: Wednesday, May 04, 2011 5:54 PM
Subject: Continental-List: Re: A-65 rebuild
> <twalker@cableone.net>
>
> Hi folks and Randy, :)
>
> How can I tell if my cylinders meet the specs for the new cylinders Randy
> calls out in his email from a couple of months ago?.... See below.
>
> Thanks!
>
>
> If you have a O-200 that is used in a certified aircraft, with original
> Continental cylinders identified by casting numbers, they are subject to
> cylinder head cracking.
>
> O-200's specs call for ignition timing of 28 degrees BTDC and a redline of
> 2800 rpm. Because of the head cracking problem, there is a three decades
> old AD that requires the timing to be retarded to 24 degrees BTDC. This
> decreases horsepower in an effort to alleviate the cylinder head cracking.
>
> Is this cracking a result of cylinder head design geometery or the fact
> that
> these cylinders were designed to run on 80 octane fuel which is no longer
> available? I can't answer that. I do know that the cylinder head cracking
> is real and does occur often.
>
> These same cylinders are used on most the small Continental 4 cylinder
> engines as well as the C-145/O-300 six cylinder engines. As the O-200 is
> the only one that has the 2800 RPM redline, this AD doesn't apply to the
> other engines as they don't turn as fast. Does that mean turning at a
> lower
> RPM won't cause head cracking? That has not been my experience.
>
> --------
> Tommy Walker
> N8701 - Anniston, AL
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=338943#338943
>
>
--------------------------------------------------------------------------------
Checked by AVG - www.avg.com
18:34:00
Message 4
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| Subject: | Re: A-65 rebuild |
Do not archive
Hey Tommy:
Go here for the AD that describes the O-200 cylinder situation regarding
the AD:
http://www.airweb.faa.gov/Regulatory_and_Guidance_Library/rgAD.nsf/0/5FD3727F609E1E0686256848004B6075?OpenDocument
This AD supersedes the older AD that requires the timing change. I believe
it describes the cylinder casting numbers where the AD still applies.
You might have to review the older ADs referenced to truly determine what
you have.
Regards,
Randy, Las Vegas
----- Original Message -----
From: "Tommy Walker" <twalker@cableone.net>
Sent: Wednesday, May 04, 2011 5:54 PM
Subject: Continental-List: Re: A-65 rebuild
> <twalker@cableone.net>
>
> Hi folks and Randy, :)
>
> How can I tell if my cylinders meet the specs for the new cylinders Randy
> calls out in his email from a couple of months ago?.... See below.
>
> Thanks!
>
>
> If you have a O-200 that is used in a certified aircraft, with original
> Continental cylinders identified by casting numbers, they are subject to
> cylinder head cracking.
>
> O-200's specs call for ignition timing of 28 degrees BTDC and a redline of
> 2800 rpm. Because of the head cracking problem, there is a three decades
> old AD that requires the timing to be retarded to 24 degrees BTDC. This
> decreases horsepower in an effort to alleviate the cylinder head cracking.
>
> Is this cracking a result of cylinder head design geometery or the fact
> that
> these cylinders were designed to run on 80 octane fuel which is no longer
> available? I can't answer that. I do know that the cylinder head cracking
> is real and does occur often.
>
> These same cylinders are used on most the small Continental 4 cylinder
> engines as well as the C-145/O-300 six cylinder engines. As the O-200 is
> the only one that has the 2800 RPM redline, this AD doesn't apply to the
> other engines as they don't turn as fast. Does that mean turning at a
> lower
> RPM won't cause head cracking? That has not been my experience.
>
> --------
> Tommy Walker
> N8701 - Anniston, AL
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=338943#338943
>
>
--------------------------------------------------------------------------------
Checked by AVG - www.avg.com
18:34:00
Message 5
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| Subject: | Re: A-65 rebuild |
Deese and Randy,
Thanks for the help.
Tommy
-----Original Message-----
From: owner-continental-list-server@matronics.com
[mailto:owner-continental-list-server@matronics.com] On Behalf Of Randy L.
Thwing
Sent: Wednesday, May 04, 2011 8:31 PM
Subject: Re: Continental-List: Re: A-65 rebuild
--> <n4546v@mindspring.com>
Do not archive
Hey Tommy:
Go here for the AD that describes the O-200 cylinder situation regarding
the AD:
http://www.airweb.faa.gov/Regulatory_and_Guidance_Library/rgAD.nsf/0/5FD3727
F609E1E0686256848004B6075?OpenDocument
This AD supersedes the older AD that requires the timing change. I believe
it describes the cylinder casting numbers where the AD still applies.
You might have to review the older ADs referenced to truly determine what
you have.
Regards,
Randy, Las Vegas
----- Original Message -----
From: "Tommy Walker" <twalker@cableone.net>
Sent: Wednesday, May 04, 2011 5:54 PM
Subject: Continental-List: Re: A-65 rebuild
> <twalker@cableone.net>
>
> Hi folks and Randy, :)
>
> How can I tell if my cylinders meet the specs for the new cylinders Randy
> calls out in his email from a couple of months ago?.... See below.
>
> Thanks!
>
>
> If you have a O-200 that is used in a certified aircraft, with original
> Continental cylinders identified by casting numbers, they are subject to
> cylinder head cracking.
>
> O-200's specs call for ignition timing of 28 degrees BTDC and a redline of
> 2800 rpm. Because of the head cracking problem, there is a three decades
> old AD that requires the timing to be retarded to 24 degrees BTDC. This
> decreases horsepower in an effort to alleviate the cylinder head cracking.
>
> Is this cracking a result of cylinder head design geometery or the fact
> that
> these cylinders were designed to run on 80 octane fuel which is no longer
> available? I can't answer that. I do know that the cylinder head cracking
> is real and does occur often.
>
> These same cylinders are used on most the small Continental 4 cylinder
> engines as well as the C-145/O-300 six cylinder engines. As the O-200 is
> the only one that has the 2800 RPM redline, this AD doesn't apply to the
> other engines as they don't turn as fast. Does that mean turning at a
> lower
> RPM won't cause head cracking? That has not been my experience.
>
> --------
> Tommy Walker
> N8701 - Anniston, AL
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=338943#338943
>
>
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