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LT4 Supercharger Description and Operation
Intake Manifold/Supercharger Assembly
The LT4 Roots-type supercharger is a positive displacement pump that consists of 2 counter-rotating rotors installed into the
lower intake manifold housing. The rotors are designed with 4 lobes and a helical twist. The rotors of the supercharger are
designed to run at a minimal clearance, not in contact with each other or the housing and are timed to each other by a pair of
precision spur gears which are pressed onto the rotor shafts. The rotors are supported at each end by self-lubricating non-
serviceable bearings. The drive belt pulley is pressed onto the input shaft. The input shaft is coupled to the rotor shaft. Both
the belt pulley and shaft coupling are also non-serviceable.
The upper intake manifold housing has an integrated intercooler. Cooling the air enhances the effectiveness of the
supercharger. The intercooler uses conventional coolant in a system that is separate from the engine cooling system. The
intercooler system includes two charge air coolers/heat exchangers, a water manifold assembly, and a variety of sensors
to monitor air temperature and pressure. The water manifold, located at the front of cover transfers coolant to the cover via
four internal transfer tubes. The transfer tubes and water manifold are sealed with O-rings and press-in-place seals. Coolant
enters the inlet port of the water manifold assembly, is directed into and through the two charge air coolers/heat exchangers,
and exits back into the water manifold. Coolant then exits the water manifold outlet port returning to the separate cooling
system. The two charge air coolers/heat exchangers are not serviceable
The supercharger assembly consists of the following components:
• Lower Intake Manifold Housing, to include rotors, gears, bearings, shaft coupling, and drive belt pulley
• Bypass Valve
• Bypass Actuator
• Throttle Body Assembly
• Evaporative Emission Canister Purge Valve
• Inlet Pressure Sensor
• Manifold Air Pressure and Temperature Sensor
• Over boost Control Solenoid
• Water Manifold Assembly
• Charge Air Coolers/Heat Exchangers
• Intake Air Temperature (IAT) Sensor
• Air Outlet Pressure Sensor
Operation
The supercharger is designed to increase the air pressure and density in the intake manifold. When this air is mixed with
the correct amount of fuel the result is more power from the engine. This excess air creates a boost pressure in the intake
manifold with a maximum engine boost of 66.9 kPa (9.7 psi). Because the supercharger is a positive displacement pump and
is directly driven from the engine drive belt system, boost pressure is available at all driving conditions.
LT4 Engine Installation
TITLE
19332703
IR 12AU15
PART NO.
4
40
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