System Operation

Lubrication System 

The engine lubrication system operates as follows:

• Oil is drawn into the oil pump through the oil pump screen cover and tube in the sump of the oil pan.
• Oil is pumped through the oil filter on the left front side of the cylinder block.
• Oil enters the main gallery where it is distributed to the crankshaft main journals and to the cylinder head.
• From the main journals, the oil is routed through cross-drilled passages in the crankshaft to lubricate the connecting rod bearings. Controlled leakage through the crankshaft main bearings and connecting rod bearings is slung radially outward to cool and lubricate the cylinder walls as well as the entire connecting rod, piston and piston ring assembly.

Valve Train 

The valve train uses direct acting mechanical buckets (DAMB). The camshaft lobes are positioned directly above mechanical buckets which are positioned on top of the valves.

Induction System 

The iVCT system allows variable control of the intake valve closing which optimizes combustion at full load providing improved power and low speed torque (broadening the torque curve). This also enables variable valve overlap which provides better fuel economy and emissions and provides optimized cold start operation with improved exhaust emissions.