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1. 10:51 AM - Re: Hello... out there. Story time. (Richard)
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| Subject: | Hello... out there. Story time. |
They call it de-rating.
Richard
> Subject: Re: TeamGrumman-List: Hello... out there. Story time.
> To: teamgrumman-list@matronics.com
> From: flying-nut@cfl.rr.com
> Date: Tue=2C 11 Aug 2015 21:11:14 -0400
>
om>
>
> On 8/11/2015 8:24 PM=2C Dj Merrill wrote:
> >
> > On 8/11/2015 3:36 PM=2C Gary L Vogt wrote:
> >> There is nothing magic about the 2400 hour TBO.
> >
> > In reality "TBO" is something of a misnomer. It is pretty rare for an
> > engine to make it all the way to the published "Time Before Overhaul"
> > time without having at least one partial overhaul (top end) done along
> > the way.
> >
> > -Dj
> >
> I'm going to disagree ..... kinda. I've had three engines=2C O-235=2C
> O-320=2C and O-360 that went quite a ways beyond that 2400 TBO without
> even a top. All you have to do is fly them often=2C change the oil (I do
> every 25 hours) and keep the plugs in good shape. Let them sit for
> months without running and I'd say those engines won't make TBO.
>
> I was having a discussion with a Lycoming engineer about the O-360 in my
> Pitts. He kept saying 'you can't do that' over and over. High test auto
> fuel and 3300 RPMs weren't within the limits! Finally=2C he went 'off the
> record' and I learned a great deal. Almost all the 'limits' (RPM=2C type
> of fuel=2C TBO etc=2C) are there so the engine will pass certification.
The
> limits are conservative because failure during certification is hugely
> expensive and just not an option.
> Linn
>
>
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