Quote:
Originally Posted by Roman
Yeah that's what I mean, the exact purpose is to measure *the difference* in pressure, not the overall pressure.
And although atmospheric pressure is *approximately* 14.7 PSI, it changes depending on altitude, whether there's a high or a low pressure system moving through, etc!
What's the difference between 14.5psi absolute atmospheric pressure, and 20.5 pounts of absolute pressure in the manifold?
6psi difference, so it is shown as 6psi on your gauge.
When the motor is off, and the absolute atmospheric pressure is 14.7psi, and the absolute pressure inside the manifold is also 14.7psi, what is the difference between the two figures?
0.00 psi, which is what the gauge reads.
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I wonder about that though, wouldn't 6psi boost at high altitude be more dangerous than 6psi at sea level? Since it's 6psi + whatever extra it is because of altitude, hence my grief with those gauges that measure the difference....and my preferring to have a gauge that would display the "real" pressure
Bar (abs) & Bar (g) also appears in fluid dynamics, got that in mechanical & chemical engineering major (s) at the Uni.....Hydro engineers should damn know this like back of their hands!