On 02/26/2012 09:28 PM, Budd Cochran wrote:
> "RainBird"<
pla...@grassyknoll.org> wrote in message
> news:jichol$nsb$1...@speranza.aioe.org...
>> On 02/25/2012 09:04 PM, Budd Cochran wrote:
>>
>>>
>>> Engine's make vacuum, unless they are a diesel, independent of ambient
>>> air
>>> pressures.
>>>
>>> That the part you couldn't grasp and the part that made your answers
>>> WRONG!
>>
>> Sorry Budlette, but you're messed up.
>>
>> Vacuum is not independent of ambient air pressure. It's probably best to
>> forget the term "vacuum" and think "differential pressure" instead,
>> because vacuum doesn't power anything. It can't. Ambient air pressure does
>> the work. That's why I suggested you move the truck to sea level, where
>> air pressure is greater. A ridiculous thing to do and, depending on the
>> failure mode of the system, it may have worked.
>
> What's this? Afraid to use your real name?
>
> Then explain how an engine produces the same manifold vacuum at 8500' as it
> does at 5000'.
It doesn't. Explain how an engine can produce a large pressure drop at
sea level, and the same large pressure drop at the edge of space.
How is your "vacuum" powered heater control going to work there? Sort
of... not at all.
That's why I asked NotMe (airplane owner and ex-NASA instrument
specialist idiot who didn't have a clue) the questions about aircraft
gyro instruments and vacuum pumps vs. positive pressure pumps, at low
and high altitudes. A vacuum pump isn't going to do anything in a
near-vacuum! At some lofty altitude, you have to give up sucking against
a vacuum, and start blowing instead to produce positive pressure on the
other side of the instrument.
> Come on, overwork that lonely brain cell of yours.
It's okay, I only need to use one cell.