Today's Message Index:
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1. 10:35 AM - [Please Read!] Matronics List Server Back Online... (dralle@matronics.com (Matt Dralle))
2. 05:50 PM - Re: owner produced parts-camshaft? (CardinalNSB@aol.com)
3. 06:41 PM - Re: Re: owner produced parts-camshaft? (Archie)
4. 09:25 PM - Re: Re: owner produced parts-camshaft? (Danny Lawhon)
5. 09:26 PM - Aviation News (AVIATION GROUP)
Message 1
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| Subject: | [Please Read!] Matronics List Server Back Online... |
--> Engines-List message posted by: dralle@matronics.com (Matt Dralle)
System problems continue to plague the Matronics Email server.
Incoming List mail was being rejected from about 12am Monday morning
until about 10am PDT Monday 4/11. It is unclear at this time what is
causing the system problem, but I am feverishly working on the issue.
I had to restore a list subscriptions database from an April 6th backup
because all of the list files had been truncated. I then reran all of
the subscribe/unsubscribe requests since the 6th. You may have just
received a subscribe/unsubscribe request and the FAQ if you've
subscribed/unsubscribed since the 6th.
At this time new posts are being processed and operation should be
considered normal.
More as information developes...
Matt Dralle
Matronics Email List Admin
DO NOT ARCHIVE
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http://www.matronics.com/ W.W.W. | Featuring Products For Aircraft
Message 2
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| Subject: | Re: owner produced parts-camshaft? |
--> Engines-List message posted by: CardinalNSB@aol.com
I partially understand the owner produced part concept regarding its
legality for use on a certified aircraft.
Door handles and the like are conceptually easy for me to understand.
Nothing I have read limits the type of parts that may be owner produced,
perhaps I have missed such a limitation.
Seriously, how does one obtain specs on such things as camshafts? I do
appreciate that they may be "secret" but my guess is that within the industry
they are known. How does the FAA keep track, for instance does the FAA keep a
secret file on the Lycoming camshaft specs? that is not open to public view?
since there are pma'd cam replacements, somehow the FAA has to apply
Lycoming's specs to the pma parts. I am no patent lawyer but I assume that the
existence of a pma manufactured part is inconsistent with patent protection,
unless they were licensed by the patent holder, my understanding is that Lycoming
is not helping alternate suppliers stay in business.
Probably the cam grinders know, has anyone had their cam reground? probably
not cost effective anymore.
Thanks for listening. Skip Simpson
Message 3
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| Subject: | Re: owner produced parts-camshaft? |
--> Engines-List message posted by: "Archie" <archie97@earthlink.net>
First, any well equipped shop can replicate any camshaft.
Most shops, such as mine, also employ a "cam doctor" which in a few minutes
can identify Lift, Duration, Phase, Opening and Closing accelerations, etc.
You can do this all yourself, albeit time consuming. All that is needed is a
large
degree wheel, two 2" travel dial indicators, a calculator, and centers (such
as a
lathe long enough to acommodate).
These camshafts are nothing special, and I have no idea why the majors are
reluctant to supply such simple info.
Any major camshaft manufacturer/ grinder can regrind your existing cam to
original,
or slightly modified specs.
If you need something really special, a new blank core is the only way to
start.
Have a racing cam grinder do the work. (they are more accurate than the OEM,
as I have compared.) Make sure to indicate it's use.= An airboat.(not
aviation)
Archie
> --> Engines-List message posted by: CardinalNSB@aol.com
>
> I partially understand the owner produced part concept regarding its
> legality for use on a certified aircraft.
>
> Door handles and the like are conceptually easy for me to understand.
>
> Nothing I have read limits the type of parts that may be owner produced,
> perhaps I have missed such a limitation.
>
> Seriously, how does one obtain specs on such things as camshafts? I do
> appreciate that they may be "secret" but my guess is that within the
> industry
> they are known. How does the FAA keep track, for instance does the FAA
> keep a
> secret file on the Lycoming camshaft specs? that is not open to public
> view?
> since there are pma'd cam replacements, somehow the FAA has to apply
> Lycoming's specs to the pma parts. I am no patent lawyer but I assume
> that the
> existence of a pma manufactured part is inconsistent with patent
> protection,
> unless they were licensed by the patent holder, my understanding is that
> Lycoming
> is not helping alternate suppliers stay in business.
>
> Probably the cam grinders know, has anyone had their cam reground?
> probably
> not cost effective anymore.
>
> Thanks for listening. Skip Simpson
>
>
>
Message 4
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| Subject: | Re: owner produced parts-camshaft? |
--> Engines-List message posted by: Danny Lawhon <dlawhon@yahoo.com>
Archie, I have some old cam spec's that I would like
to have ground, Its an old stock grind of lycoming but
they don't make any more.. these are the spec's
Base Circle diameter. Intake lobes 1.188
Base Circle Diameter Exhaust lobes 1.171
Max Lift all lobes Intake 352 Exhaust .355
Main Brg Dia 1.0265
max runout on mains .0005
how hard would that be to make , and can you
make one ?
Danny...
--- Archie <archie97@earthlink.net> wrote:
> --> Engines-List message posted by: "Archie"
> <archie97@earthlink.net>
>
> First, any well equipped shop can replicate any
> camshaft.
> Most shops, such as mine, also employ a "cam doctor"
> which in a few minutes
> can identify Lift, Duration, Phase, Opening and
> Closing accelerations, etc.
> You can do this all yourself, albeit time consuming.
> All that is needed is a
> large
> degree wheel, two 2" travel dial indicators, a
> calculator, and centers (such
> as a
> lathe long enough to acommodate).
> These camshafts are nothing special, and I have no
> idea why the majors are
> reluctant to supply such simple info.
> Any major camshaft manufacturer/ grinder can regrind
> your existing cam to
> original,
> or slightly modified specs.
> If you need something really special, a new blank
> core is the only way to
> start.
> Have a racing cam grinder do the work. (they are
> more accurate than the OEM,
> as I have compared.) Make sure to indicate it's
> use.= An airboat.(not
> aviation)
> Archie
>
>
> > --> Engines-List message posted by:
> CardinalNSB@aol.com
> >
> > I partially understand the owner produced part
> concept regarding its
> > legality for use on a certified aircraft.
> >
> > Door handles and the like are conceptually easy
> for me to understand.
> >
> > Nothing I have read limits the type of parts that
> may be owner produced,
> > perhaps I have missed such a limitation.
> >
> > Seriously, how does one obtain specs on such
> things as camshafts? I do
> > appreciate that they may be "secret" but my guess
> is that within the
> > industry
> > they are known. How does the FAA keep track, for
> instance does the FAA
> > keep a
> > secret file on the Lycoming camshaft specs? that
> is not open to public
> > view?
> > since there are pma'd cam replacements, somehow
> the FAA has to apply
> > Lycoming's specs to the pma parts. I am no patent
> lawyer but I assume
> > that the
> > existence of a pma manufactured part is
> inconsistent with patent
> > protection,
> > unless they were licensed by the patent holder, my
> understanding is that
> > Lycoming
> > is not helping alternate suppliers stay in
> business.
> >
> > Probably the cam grinders know, has anyone had
> their cam reground?
> > probably
> > not cost effective anymore.
> >
> > Thanks for listening. Skip Simpson
> >
> >
> >
>
>
>
>
> browse
> Subscriptions page,
> FAQ,
>
>
>
>
>
>
__________________________________
Message 5
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--> Engines-List message posted by: AVIATION GROUP <aviationgrp@yahoo.com>
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