---------------------------------------------------------- Engines-List Digest Archive --- Total Messages Posted Mon 04/11/05: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 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 _____________________________________ Time: 10:35:37 AM PST US From: dralle@matronics.com (Matt Dralle) Subject: Engines-List: [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 -- Matt G. Dralle | Matronics | P.O. Box 347 | Livermore | CA | 94551 925-606-1001 Voice | 925-606-6281 FAX | dralle@matronics.com Email http://www.matronics.com/ W.W.W. | Featuring Products For Aircraft ________________________________ Message 2 _____________________________________ Time: 05:50:47 PM PST US From: CardinalNSB@aol.com Subject: Engines-List: 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 _____________________________________ Time: 06:41:25 PM PST US From: "Archie" Subject: Re: Engines-List: Re: owner produced parts-camshaft? --> Engines-List message posted by: "Archie" 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 _____________________________________ Time: 09:25:56 PM PST US From: Danny Lawhon Subject: Re: Engines-List: Re: owner produced parts-camshaft? --> Engines-List message posted by: Danny Lawhon 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 wrote: > --> Engines-List message posted by: "Archie" > > > 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 _____________________________________ Time: 09:26:21 PM PST US From: AVIATION GROUP Subject: Engines-List: Aviation News --> Engines-List message posted by: AVIATION GROUP AVIATION News Group to view & share your valuable comments and the latest trends and happenings in the aviation industry. 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