Variable Intake System: Freelander

The inlet manifold chamber combines plenum resonance for good low speed torque, with variable length primary tracts for optimum mid and high speed torque. The throttle body assembly feeds into a "Y" piece which separates into two secondary inlet pipes. The secondary pipes feed into two main plenums, one for each cylinder bank. A balance valve is located at the closed end of the plenums. The balance valve is controlled by an electric actuator which connects the two plenums together. The variable intake system uses valves and actuators to vary the overall tract length of the inlet manifold chamber. The primary tract length to the cylinder head face is approximately 500 mm. The short inlet tract plenum is approximately 350 mm from the cylinder head.