ORIGINAL: combatpigg
ORIGINAL: Sport_Pilot
Sorry but there is no such thing as a negative pressure except relative to atmospheric. To a properly trained engineer there is no negative pressure so the manifold is always under positive pressure. Your thinking is pre space age.
There is more written about negative pressure than what 1000 ''properly trained engineers'' could read in a lifetime.
It doesn't even have to be relative to atmospheric to be considered negative, relative to surrounding pressure is good enough to qualify as negative.
Even I know that and I'm not properly trained.
Look you are now simply repeating what I have said. In my original post I said manifold pressure not vacuum or negative pressure. That term automatically means I am referring to absolute pressure not vacuum or negative pressure. So based on that reference my statement is exactly correct. I was simply stating I prefer not to think in terms of vacuum. I do all my calculations referencing absolute pressure then I calculate the resulting difference from atmospheric pressure after the fact. I am not saying there is no such thing as a term negative pressure, only that it is a different reference from what I was using.