Whats the PSI of Atmosphere?

[noyzboy]

Been away and lost track of this thread.
looking at MARTINY\'s post of 26th September 2005, 03:45 PM, the difference between the second and third columns is a consistent 14.7
So the second column is the absolute presssure + boost pressure and the third column is the boost pressure only.

Engine techies are interested in atmospheric pressure as the14.7 psi differential between the atmosphere and a vacuum is the most driving pressure avaiable to push a fuel mixture into the cylinders (of old tech cars)