Gas engines produce vacuum by themselves. The advantage of using this vacuum is that the power of the vacuum can be multiplied many times to produce a very strong pull. Good example of this is the master cylinder on a car with disc brakes.
you get vacuum in you intake manifold because the throttle plate is closed blockin air flow and because the engine when running "sucks" air. so when you have something sucking in basicaly a closed chamber (intake manifold) it creates vacuum...
vacuum basically = air at less than ambient pressure
20hg on your gauge is 20" mercury. One atmosphere is a little less than 30" mercury or 14.7 pounds/square in.
By lightly using the gas peddle and keeping vacuum high, you will improve your gas mileage.
Average sea level air pressure is 14.7 pounds/ square inch which is one atmosphere. The boost-vacuum gauge reads zero for this pressure.
Vader's gauge reads vacuum in inches of mercury and boost in psi.
Yes, we couldn't live, and our cars wouldn't run without oxygen.
A column of air one inch square, reaching into space from sea level, would weigh 14.7 pounds.
A column of hg (mercury) one inch square, 29.92 inches high would also weigh 14.7 pounds.
Teach me about vacuum
