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2. Velocity stack - Wikipedia

   en.wikipedia.org/wiki/Velocity_stack

   Short velocity stacks on a 302 cu.in. Ford FE engine in the tight confines of a Ford GT-40. A velocity stack, trumpet, or air horn [1] is a typically flared, parallel-sided tubular device fitted individually or in groupings to the entry of an engine's air intake system to smooth high speed airflow, and allow engine intake track tuning to incorporate pressure pulses created by its internal ...

3. Cylinder head porting - Wikipedia

   en.wikipedia.org/wiki/Cylinder_head_porting

   The graph above shows the intake runner pressure over 720 crank degrees of an engine with a 7-inch (180 mm) intake port/runner running at 4500 rpm, which is its torque peak (close to maximum cylinder filling and BMEP for this engine). The two pressure traces are taken from the valve end (blue) and the runner entrance (red).

4. Variable-length intake manifold - Wikipedia

   en.wikipedia.org/wiki/Variable-length_intake...

   At low revolutions per minute (rpm), the speed of the airflow is increased by directing the air through a longer path with limited capacity (i.e., cross-sectional area) and this assists in improving low engine speed torque. At high rpm, the shorter and larger path opens when the load increases, so that a greater amount of air with least ...

5. Edelbrock - Wikipedia

   en.wikipedia.org/wiki/Edelbrock

   Edelbrock has two facilities in North Carolina: the Edelbrock Carburetor Division in Sanford, and the Edelbrock Race Center in Mooresville. Vic Edelbrock founded the corporation in 1938 when his desire to increase the performance of his 1932 Ford Roadster led him to design a new intake manifold, [3] friends and fellow drivers soon wanted one as ...

6. Manifold vacuum - Wikipedia

   en.wikipedia.org/wiki/Manifold_vacuum

   Manifold vacuum, or engine vacuum in a petrol engine is the difference in air pressure between the engine's intake manifold and Earth's atmosphere. Manifold vacuum is an effect of a piston's movement on the induction stroke and the airflow through a throttle in the intake manifold of an engine. It is a measure of the amount of restriction of ...

7. Multi-valve - Wikipedia

   en.wikipedia.org/wiki/Multi-valve

   A cylinder head of a four valve Nissan VQ engine engine. A multi-valve or multivalve engine is one where each cylinder has more than two valves (an intake, and an exhaust).A multi-valve engine has better breathing, and with more smaller valves (having less mass in motion) may be able to operate at higher revolutions per minute (RPM) than a two-valve engine, delivering more power.