Chevrolet Performance LTG Crate Guia De Instalacion página 5

The primary control is through the positive crankcase ventilation (PCV) valve orifice (2) which meters the flow at a rate depending
on intake manifold vacuum. The PCV valve is an integral part of the camshaft cover. Fresh air is introduced to the engine through
PVC (1) under normal operating conditions. If abnormal operating conditions occur, the system is designed to allow excessive
amounts of blow by gases to back flow through the crankcase vent valve (3) into the intake system to be consumed by normal
combustion. The connection of the PCV line should be upstream of the compressor inlet and at least 12 inches downstream of the
mass air flow sensor.
There is a one way valve (2) in the camshaft cover in order to prevent the crankcase from being pressurized by positive pressure
in the intake manifold when the turbocharger (5) is in operation. When the turbocharger is operational, the pressure in the intake
manifold can exceed atmospheric pressure which, without the one way valve, would force oil and PCV gases out of the camshaft
cover and into the induction system, via the hose to the camshaft cover. This can cause coking of the throttle body and induction
system, and can reduce the efficiency of both combustion and the intercooler system. In normal operation the PCV gases are
drawn into the air stream post intercooler (6). However, when the turbo is spooled up the turbo can become the vacuum source
for the vent system. PVC valve (4) mounted in the top of the cam cover and connected to the turbocharger controls the maximum
flow so the crankcase stays at a normal vacuum during normal operating conditions.
Cooling System Description
Coolant flows from the water pump outlet into the engine block. In the engine block, the coolant circulates through the water
jackets surrounding the cylinders where the coolant absorbs heat.
The coolant then flows through the cylinder head gasket openings and into the cylinder heads. In the cylinder heads, the coolant
flows through the water jackets surrounding the combustion chambers and valve seats, where the coolant absorbs additional
heat.
Coolant is also directed to the throttle body. There the coolant circulates through passages in the casting. During initial warm-up,
the coolant assists in warming the throttle body. During normal operating temperatures, the coolant assists in keeping the throttle
body cool.
In the production vehicle some coolant flows from the engine water outlet, to the heater core, and then back to the engine block.
This provides the passenger compartment with heat and defrost capability as the coolant warms up and can be routed as desired
by the customer if this feature is desired.
From the cylinder heads, the coolant flows to the engine water outlet bypass valve. The flow of coolant will either be stopped
at the valve until the engine reaches normal operating temperature, or the coolant will flow through the bypass valve to cycle
through the bypass pipe back to the thermostat and also through the radiator inlet pipe to the radiator where the coolant is cooled.
Additional coolant is also allowed to pass out of the top of the cylinder head and the top of the radiator as the coolant volume
expands, and over to the surge tank through the surge tank inlet hose, where it's retained or passes back to the engine block
through the surge tank outlet/heater outlet hose.
Coolant then flows from the radiator outlet to the thermostat. The flow of coolant will either be stopped at the thermostat until the
engine reaches normal operating temperature, or the coolant will flow through the thermostat and into the water pump inlet. At this
point, the coolant flow cycle is completed.
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LTG Crate Engine IR 24OC14
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