Spider 2.0
Blow-by gases and oil vapors developed during engine operation are drawn from the crankcase up through the camshaft cover, into the combustion chambers where they are mixed with the incoming air/fuel charge, and burned during the combustion cycle.
The crankcase ventilating system controls crankcase vapors both at high engine RPM, and at idling speed when the throttles are closed. Crankcase vapors flow from the camshaft cover to the oil separator via the CV hose. Vapors enter either the main or secondary crankcase ventilating system according to the position of the throttles.
When throttles are fully opened, crankcase vapors are delivered from the oil separator, through the main system CV hose to the manifold gallery. From the manifold gallery, vapors are passed to the throttle throats via the 4 intake ducts.
When the throttles are either closed or partially open, the crankcase vapors are drawn from the oil separator via the secondary system CV hose to the equalizer. In the equalizer, they are mixed with fresh air and are delivered to the intake ducts downstream from the throttles. Oil collected in the oil separator returns to the oil pan via the oil return hose.