Suppose we examine the pressure levels inside an intake manifold at the time the intake valve begins to open. At this point, cylinder pressure is greater than intake manifold pressure.

So until cylinder pressure becomes equal to manifold pressure (approaching atmospheric in a normally-aspirated engine), exhaust residue flows back into the intake manifold.

Manifold pressure only gives an approximation of economy however, and we decided to use a more controlled environment for measurement.

Since the wastegate is sometimes referenced off manifold pressure, we'll assume pressure is constant and ignore the pressure drop across piping and the intercooler.

The no-replacement-for-displacement die-hards aren't all wrong about turbo tech; it isn’t flawless. But there is one interesting fix for some of its problems, and it is the twin-scroll turbocharger.

Manifold Pressure The air/fuel mixture entering the engine reaches the inlet valve at the pressure in the inlet manifold (the Manifold Pressure). Unless the throttle is wide open, this pressure will ...

Intake tuning helps automakers harness the power of pressure waves, forcing more air into an engine.

The new engine formula will reduce intake manifold pressure to 37 inches in 2001, a decrease of approximately 50-60 horsepower, and then a drop to 34 inches of boost will take place in 2002 ...

Technicians can now view, log, and analyze live system data, such as temperature, pressure, subcooling and superheating, ...

The manifold absolute pressure sensor reads the amount of pressure or vacuum (also called “engine load”) in the intake manifold, where outside air is divvied up in proper amounts and ...

A service update has been issued for certain 2021 model-year GM trucks and SUVs over an issue related to the vehicles’ engine manifold pressure sensor.

It's essentially like having gears for your airplane, where the manifold pressure is controlled by the throttle, engine RPM is controlled by the prop, and as before, fuel flow by the mixture control.