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The upper intake plenum is of the split-chamber design with Toyota's ACIS variable-intake system feeding three sets of runners for both heads. Because the VZ series was originally for pickup truck and SUV use, the 3VZ-FE happens to be a physically tall motor. To make the engine fit in FWD engine bays, Toyota tilted the motor towards the firewall.
Carburetors used as intake runners A cutaway view of the intake of the original Fordson tractor (including the intake manifold, vaporizer, carburetor, and fuel lines). 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 upper intake manifold has a sticker located on the passenger side of the forward plenum denoting "Split Port Induction". For 1999 the 3.8 L in the Mustang was updated to use the split port cylinder heads originally introduced on the Windstar, but did not use IMRC, leaving all twelve intake runners open at all times.
The term "plenum" was coined in the 1670s, derived from Latin adjective plenus ("filled, full"). The usage originates from classical theories of physics and the notion that "nature abhors a vacuum". These gave rise to the notion of 17th century 'plenum' as the opposite of vacuum, and all things "being either Plenum or Vacuum". [2]
The upper and lower intake manifold is now aluminum on the naturally aspirated models. Intake ports are mildy enlarged; 1.83 in (46.5 mm) intake valves (instead of 1.8 in (45.7 mm) as on Series II) and 1.52 in (38.6 mm) exhaust valves were introduced in 2003 engines, just before switching to Series III.
The intake manifold uses a two piece design with a lower section bolting to the heads containing the coolant bridge, injectors and various vacuum lines. The upper intake manifold then bolts to the lower section and is unlike the EA82 or EJ22 "spider" manifold designs in that there is no central plenum chamber.
The composite upper intake manifold and cast aluminum lower intake from the L35 engine is also used on the LU3. The LG3 uses a cast aluminum upper intake and a cast iron lower intake. [7] The lower intake eliminated the EGR valve. The LU3 also received a "quiet cam" to help reduce vibration at both idle and high engine speeds.
The intake manifold uses a two piece design with a lower section bolting to the heads containing the coolant bridge, injectors and various vacuum lines. [10] The upper intake manifold then bolts to the lower section and is unlike the EA82 or EJ22 "spider" manifold designs in that there is no central plenum chamber. [11]
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