I think that information is important to us coupe owners. When looking to buy, I found many "low time" engines, that had been majored decades ago! Someplace there is a "guess" as to how it was stored for those years. I finally chose one that was fairly low hours (125 hrs SMOH) and 14 years since overhaul! Fourteen years is a long time, but I satisfied myself that the engine had been run frequently enough during that time to make it a good gamble in my eyes. I think Continental time limits are 12 years regardless of hours, so I took a chance on it. So far, so good, time will tell.
--- In [email protected], "Roy Stubbs" <rdstu...@...> wrote: > > There have been some good comments and individual examples of good running > engines with fatal flaws and engines that have run well past TBO. As an > engineer I am well aware of âinfant-mortality,â and also the more common > idea that if something is operating well âdonât fix it.â > > > > The EAA article on TBO is part of a longer running series on > Reliability-Centered Maintenance, a program reportedly now used by the > airline industry and the military. More specifically the EAA article on > engine TBO drew on five years of data covering the years 2001-2005 for small > piston airplane accidents attributed by the NTSB to engine failure. The data > shows a steady and rapid decline in engine failure accidents both as Hours > Since Overhaul and Years Since Overhaul. Only after 3,000 hours and/or 25 > years does the accident rate begin to pick up. What the NTSB data cannot > show is much about failures beyond TBO as most engines are overhauled at the > point. > > > > Assuming that engines failures will begin to increase at and beyond TBO > produces a bathtub shaped failure curve. To stay out of the presumptive wear > out zone we overhaul our engines which puts us back into the infant-mortality > zone. > > > > What to do? Maybe find an airplane with about 1,000 hours on the engine and > operate it for 1,000 hours. That is what the data âsuggests.â > > > > J > > > > From: [email protected] [mailto:[email protected]] On > Behalf Of Donald > Sent: Tuesday, February 16, 2010 12:24 PM > To: [email protected] > Subject: [ercoupe-tech] Re: Engine TBO > > > > > > > > But, to play the devils advocate, that crack did not just magically appear at > some determined TBO. There are schools of thought that also show a good > running engine should not be tampered with, you also run the risk of problems > in the overhaul. One of the members of this group just had a catastrophic > engine failure, with crank busted, at like 300 hours SMOH, but we would not > want to therefore become believers that one should overhaul at 300 hrs. I am > aware of MANY engines that have run to the neighborhood of twice TBO with no > problems. > > --- In [email protected] <mailto:ercoupe-tech%40yahoogroups.com> , > "Jerry Eichenberger" <JEichenberger@> wrote: > > > > Jerry - > > > > My story about TBO was that about 30 years ago I was in a group that owned > > an Aztec and Bonanza. The Bonanza was at TBO. Against my wishes, the group > > voted to go another 100 hours. The engine was running like a Swiss watch, > > burned almost no oil, compressions were excellent; you get the idea. > > > > After that 100 extra hours, most of the group wanted to go another 100. I > > put my foot down and said to either overhaul it or buy me out. We > > overhauled it. > > > > The crankshaft had a crack 270 degrees around the circumference. Who knows > > how long the crack had been there, but it was likely to have > > catastrophically failed within that next 100 hours had we not torn down the > > engine. > > > > Hence, I'm a a believer in TBO. What little do you gain by assuming that > > the innards of the engine are OK just because compression and oil burn are > > good? > > > > Jerry E. > > -----Original Message----- > > From: [email protected] <mailto:ercoupe-tech%40yahoogroups.com> > > [mailto:[email protected] > > <mailto:ercoupe-tech%40yahoogroups.com> ]On Behalf Of Jerry Ward > > Sent: Monday, February 15, 2010 5:14 PM > > To: [email protected] <mailto:ercoupe-tech%40yahoogroups.com> ; > > Roy Stubbs > > Subject: Re: [ercoupe-tech] Engine TBO > > > > > > I just read the article and it appears to me that they are on to something > > smart. I would hope that the FAA would read this and change the way engines > > are overhauled. I would hate to have to overhaul a perfectly good running > > engine that is strong and has good compression and seems to not burn too > > much oil. It appears that the fresh engines are the ones to worry about. > > Jerry in the Great Northwest. > > > > --- On Mon, 2/15/10, Roy Stubbs <rdstubbs@> wrote: > > > > > > From: Roy Stubbs <rdstubbs@> > > Subject: [ercoupe-tech] Engine TBO > > To: [email protected] <mailto:ercoupe-tech%40yahoogroups.com> > > Date: Monday, February 15, 2010, 1:02 PM > > > > > > > > > > Has anyone on the list read this monthââ¬â¢s EAA Sport Aviationââ¬â¢s > > article ââ¬Å"Is Engine TBO a Myth?ââ¬Â? > > > > > > > > Wonder what your thoughts might be? > > > > > > > > From: ercoupe-tech@ yahoogroups. com [mailto:ercoupe- t...@yahoogroups > > .com] On Behalf Of Roy Stubbs > > Sent: Monday, February 15, 2010 8:55 AM > > To: 'Jack Burwell'; 'Ronald Hynes'; 'earl johnson' > > Cc: ercoupe-tech@ yahoogroups. com > > Subject: RE: Fw: RE: [ercoupe-tech] Floor board removal > > > > > > > > > > > > Mine are also made up of two pieces and have the rudder pedal assembly > > which needs to be removed before the floor boards can be removed. The only > > way it is accomplished is my 5ââ¬â¢6ââ¬Â 125# son and pilot buddy. > > > > > > > > From: ercoupe-tech@ yahoogroups. com [mailto:ercoupe- t...@yahoogroups > > .com] On Behalf Of Jack Burwell > > Sent: Sunday, February 14, 2010 3:08 PM > > To: 'Ronald Hynes'; 'earl johnson' > > Cc: ercoupe-tech@ yahoogroups. com > > Subject: RE: Fw: RE: [ercoupe-tech] Floor board removal > > > > > > > > > > > > Mine are made up of 2 pieces but they are still an absolute nightmare to > > remove and reinstall. > > > > -----Original Message----- > > From: ercoupe-tech@ yahoogroups. com [mailto:ercoupe- t...@yahoogroups > > .com] On Behalf Of Ronald Hynes > > Sent: Sunday, February 14, 2010 12:54 AM > > To: earl johnson > > Cc: ercoupe-tech@ yahoogroups. com > > Subject: Re: Fw: RE: [ercoupe-tech] Floor board removal > > > > > > > > I will always admire old Henry Ford and his way of thinking. When he would > > have a difficult problem with manufacturing his autos, he was said to > > assign the problem to the lazyest of his employees because if they could > > not find a better way to fix the problem then there wasn't a better way. > > After 40 years of owning and driving Fords, I follow Henry's idea and I > > simply ask my sons. Never fails me. > > > > Ron Hynes, Alberta Canada > > > > > > > > > > --- On Sat, 2/13/10, earl johnson <johnsonec2000@ yahoo.com> wrote: > > > > > > From: earl johnson <johnsonec2000@ yahoo.com> > > Subject: Fw: RE: [ercoupe-tech] Floor board removal > > To: "Tech-Ercoupe Group" <ercoupe-tech@ yahoogroups. com> > > Received: Saturday, February 13, 2010, 2:00 PM > > > > > > > > > > > > i have seen a Ercoupe with Floor Board made up of two pieces,not sure if it > > legal > > > > however i have been thinking about doing that sure would make under the > > floor board > > > > service easier. > > > > > > > > > > > > --- On Sat, 2/13/10, jackburwell2619@ comcast.net <jackburwell2619@ > > comcast.net> wrote: > > > > > > From: jackburwell2619@ comcast.net <jackburwell2619@ comcast.net> > > Subject: RE: [ercoupe-tech] Floor board removal > > To: "'rurndum'" <rurln...@smith- valley.com>, ercoupe-tech@ yahoogroups. com > > Date: Saturday, February 13, 2010, 2:00 PM > > > > > > > > I just went through the process assisting with the annual and it's a real > > pain having to remove the brake pedal and an even bigger pain reinstalling > > it and the boards. > > > > > > > > -----Original Message----- > > From: ercoupe-tech@ yahoogroups. com [mailto:ercoupe- t...@yahoogroups > > .com] On Behalf Of rurndum > > Sent: Saturday, February 13, 2010 12:37 PM > > To: ercoupe-tech@ yahoogroups. com > > Subject: [ercoupe-tech] Floor board removal > > > > > > > > I helped with an annual inspection yesterday on a '46 C Model. Removing the > > floor board was a pain because of the brake pedal being attached to it. Is > > there a modification to make the floor removal easier? > > > > Thanks! > > > > Jack > > > > > > > > > > > > > > ---------------------------------------------------------- > > > > Yahoo! Canada Toolbar : Search from anywhere on the web and bookmark your > > favourite sites. Download it now! > > >
