Engine: Description and Operation: Overview

Engine

Overview

The 2.0L GTDI (Gasoline Turbocharged Direct Injection) 4-cylinder engine has the following features:

- Dual overhead camshafts

- Four valves per cylinder

- Composite intake manifold

- Aluminum cylinder head

- Aluminum cylinder block

- GTDI (Gasoline Turbocharged Direct Injection)

- Ti-VCT (Twin Independent Variable Cam Timing)

- Electronic ignition system with coil-on-plug 4 ignition coils

Engine Identification

Always refer to these labels when installation of new parts is necessary or when checking engine calibrations. The engine parts often differ within a CID family. Verification of the identification codes will make sure the correct parts are obtained. These codes contain all the pertinent information relating to the dates, optional equipment and revisions.

Engine Code Information Label

The engine code information label, located on the front side of the valve cover, contains the following:










Engine Cylinder Identification





System Operation

Engine Oil Flow Illustration









Lubrication System

The engine lubrication system is of the force-feed type in which oil is supplied under full pressure to the crankshaft, connecting rod bearings, timing chain tensioners, camshaft bearing caps and VCT (Variable Camshaft Timing) solenoids. The flow of oil to the valve tappets and valve train is controlled by a restricting orifice located in the cylinder head gasket.

The lubrication system is designed to provide optimum oil flow to critical components of the engine through its entire operating range.

The heart of the system is a positive displacement internal gear oil pump.

Generically, this design is known as a gerotor pump, which operates as follows:

- The oil pump is chain driven off of the crankshaft.

- System pressure is limited by an integral, internally-vented relief valve which directs the bypassed oil back to the inlet side of the oil pump.

- Oil pump displacement has been selected to provide adequate volume to make sure of correct oil pressure both at hot idle and maximum speed.

- The relief valve calibration protects the system from excessive pressure during high-viscosity conditions.

- The relief valve is designed to provide adequate connecting rod bearing lubrication under high temperature and high-speed conditions.

Valve Train

The valve train uses DAMB (Direct Acting Mechanical Buckets). The camshaft lobes are positioned directly above mechanical buckets which are positioned on top of the valves.

Ti-VCT (Twin Independent Variable Cam Timing)

The Ti-VCT (Twin Independent Variable Cam Timing) system allows variable control of intake valve closing which optimizes combustion at full load providing improved power and low speed torque (broadening the torque curve) which enables variable valve overlap which provides better fuel economy and emissions and provides optimized cold start operation with improved exhaust emissions.