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2. Variable-length intake manifold - Wikipedia

   en.wikipedia.org/.../Variable-length_intake_manifold

   Fiat – Controlled High Turbulence (1989–92, Fiat Croma CHT), StarJet engine, dubbed Port Deactivation (PDA), Variable Intake System on the 131HP 1.8 16V and on the 155 HP 2.0 20V Pratola Serra engine. Ford — Dual-Stage Intake (DSI), on their Duratec 2.5 and 3.0-litre V6s, and it was also found on the Yamaha V6 in the Taurus SHO.

3. Chevrolet big-block engine - Wikipedia

   en.wikipedia.org/wiki/Chevrolet_big-block_engine

   Unlike the later, second-generation 427, it was based on the W-series 409 engine, but with a longer 3.65 in (92.7 mm) stroke. A high-rise, two-piece aluminum intake manifold and dual Carter AFB carburetors fed a 13.5:1 compression ratio to produce an under-rated SAE gross 430 hp (321 kW) and 575 lb⋅ft (780 N⋅m).

4. T-VIS - Wikipedia

   en.wikipedia.org/wiki/T-VIS

   Toyota Variable Induction System, or T-VIS, is a variable intake system designed by Toyota to improve the low-end performance of multi-valve engines. [1]T-VIS is intended to improve the low-end torque of high-performance, four-stroke internal combustion engines - by changing the geometry of the intake manifold according to the engine rotation speed.

5. Acoustic Control Induction System - Wikipedia

   en.wikipedia.org/wiki/Acoustic_Control_Induction...

   The ACIS/TVIS System. Acoustic Control Induction System, or ACIS, is an implementation of a variable-length intake manifold system designed by Toyota.. Simply put, the ACIS system uses a single intake air control valve located in the intake to vary the length of the intake tract in order to optimize power and torque, as well as provide better fuel efficiency and reduce intake "roar".

6. Inlet manifold - Wikipedia

   en.wikipedia.org/wiki/Inlet_manifold

   An inlet manifold or intake manifold (in American English) is the part of an internal combustion engine that supplies the fuel/air mixture to the cylinders. [1] The word manifold comes from the Old English word manigfeald (from the Anglo-Saxon manig [many] and feald [repeatedly]) and refers to the multiplying of one (pipe) into many.

7. Naturally aspirated engine - Wikipedia

   en.wikipedia.org/wiki/Naturally_aspirated_engine

   Typical airflow in a four-stroke engine: In stroke #1, the pistons suck in (aspirate) air to the combustion chamber through the opened inlet valve.. A naturally aspirated engine, also known as a normally aspirated engine, and abbreviated to N/A or NA, is an internal combustion engine in which air intake depends solely on atmospheric pressure and does not have forced induction through a ...