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The Alfa Romeo Modular Inlet Manifold is a variable intake system fitted to the later CF2 1.8 and 2.0 litre Twin Spark engines. [citation needed] It operates by switching between two separate air intake runners of different lengths (one pair for each cylinder) to either shorten or lengthen the path from the end of the intake runner (within the plenum) to the inlet valves.
In addition to VVT, some versions also feature variable-length intake manifold (VIS). Earlier Alfa Romeo versions use the Twin Spark ignition system. There is also a version of the four cylinder 2.0 L (1,970 cc) block using direct injection, used only in Alfa Romeo's vehicles, dubbed as JTS.
The engine is a 6.2-liter (378 cu in) Callaway-modified LS3 V8, powered by an Eaton supercharger with air/liquid intercooler integral to intake manifold. Maximum manifold pressure is 50 inches Hg, absolute. (10 psi (0.69 bar)), producing 650 bhp (SAE). The engine has a cast aluminum block and heads with six-bolt cross-bolted main caps.
These were arranged so that each cylinder of the engine had its own carburetor barrel. These carburetors found use in Maserati and Alfa Romeo racing cars. Twin updraft Weber carburetors fed superchargers on the 1938 Alfa Romeo 8C competition vehicles. [2] Fiat assumed control of the company in 1952 following Weber's disappearance in 1945.
The base 1.8-litre engine did not feature the balance shafts. CF2 and CF3 engines have plastic valve cover and variable-length intake manifold. The 3.2 V6 24V GTV model was the fastest road going Alfa Romeo at the time, capable of accelerating from 0–100 km/h in just over six seconds and attaining a top speed of 255 km/h (158 mph).
A redesigned cylinder head and manifold for improved air flow. Variable exhaust valve timing (the LW2 engine only had variable intake valve timing) Specially-developed fuel injectors. New pistons with pentroof-style centre-domes and valve eyelets for a higher compression ratio of 12.2:1 (compared to 10.2:1 for the dual fuel engine).