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2. Rotary-screw compressor - Wikipedia

   en.wikipedia.org/wiki/Rotary-screw_compressor

   The capacities of rotary-screw compressors are typically rated in horsepower (HP), Standard Cubic Feet per Minute * and pounds per square inch gauge (PSIG.) For units in the 5 through 30 HP range the physical size of these units are comparable to a typical two-stage compressor.

3. Compressor map - Wikipedia

   en.wikipedia.org/wiki/Compressor_map

   The map may be produced by driving the compressor with an electric motor with the flow resistance selected artificially using a variable area throttle valve. The compressor may also be mapped if it is part of a gas generator with a valve at the turbine exit. Campbell [10] shows a General Electric J79 compressor mapped in this way.

4. Compressor - Wikipedia

   en.wikipedia.org/wiki/Compressor

   Beyond about 5 stages or a 4:1 design pressure ratio a compressor will not function unless fitted with features such as stationary vanes with variable angles (known as variable inlet guide vanes and variable stators), the ability to allow some air to escape part-way along the compressor (known as interstage bleed) and being split into more than ...

5. Boost gauge - Wikipedia

   en.wikipedia.org/wiki/Boost_gauge

   Boost gauge on a Ford Focus RS (left) 30 psi Boost gauge Top: Turbo/APC boost gauge in a Saab 900. A boost gauge [1] is a pressure gauge that indicates manifold air pressure or turbocharger or supercharger boost pressure [2] in an internal combustion engine. They are commonly mounted on the dashboard, on the driver's side pillar, or in a radio ...

6. Compression ratio - Wikipedia

   en.wikipedia.org/wiki/Compression_ratio

   For example, if the static compression ratio is 10:1, and the dynamic compression ratio is 7.5:1, a useful value for cylinder pressure would be 7.5 1.3 × atmospheric pressure, or 13.7 bar (relative to atmospheric pressure). The two corrections for dynamic compression ratio affect cylinder pressure in opposite directions, but not in equal strength.

7. Pressure measurement - Wikipedia

   en.wikipedia.org/wiki/Pressure_measurement

   A pressure gauge reading in psi (red scale) and kPa (black scale) The SI unit for pressure is the pascal (Pa), equal to one newton per square metre (N·m −2 or kg·m −1 ·s −2). This special name for the unit was added in 1971; before that, pressure in SI was expressed in units such as N·m −2. When indicated, the zero reference is ...