Technical characteristics of LTG engine

20 13 Ward Top Ten Engines General 2.0LLTG Engine Features and Functions

Double overhead camshaft with DVVT continuously variable valve timing

Increase the low-speed torque, expand the maximum torque range, and control the exhaust emission.

Dual-channel turbocharger reduces exhaust interference, improves exhaust gas flow, and eliminates turbine lag at low engine speed.

SIDI in-cylinder direct injection technology is beneficial to ignition and combustion control, increasing air intake, improving efficiency and power, and reducing emissions by about 25% during cold start.

Air-cooled supercharging and intercooling systems reduce air temperature and increase oxygen intake; Help in-cylinder combustion and improve power.

Two-stage variable displacement oil pump matches engine oil supply and engine load; Improve fuel economy and prevent energy waste.

The tooth chain design of fine sand casting cylinder makes the meshing smoother; Noise is eliminated and durability is enhanced.

Balance shaft module integrates internal design to shorten the length of transmission chain; Thereby bee beneficial to reducing that noise of the engine.

The excellent structure of fine sand casting cylinder body inherits the noise reduction and shock absorption of Ecotec; In addition, the cast iron main bearing cover is embedded to reduce vibration and noise.

This 2.0LLTG engine can be regarded as the brother model of the American version of Regal GS, so there are many similarities between the two technologies. General 2.0LLTG engines have different data adjustment in different markets, but imported domestic engines will adopt higher output adjustment.

The general 2.0LLTG engine adopts a double scroll single turbocharger, and the turbocharger is cooled by traditional oil cooling method. The biggest advantage of double scroll single turbocharger is that it can separate the exhaust gas from adjacent cylinders according to the ignition sequence of the engine. The advantage of separation is to reduce the interference of exhaust gas flow on turbine blades, so that the engine can have higher turbine efficiency at low speed.

The general 2.0LLTG engine adopts in-cylinder direct injection technology, which is developed from diesel fuel supply system. The principle is that the gasoline is injected into the cylinder after being pressurized by the high-pressure oil pump, and the fuel pressure of the high-pressure oil pump increases, while the gasoline pressure of the 2.0LLTG engine is as high as 150bar. The high oil pressure makes the oil pump and oil supply pipeline more precise.

The general 2.0LLTG engine adopts the variable timing technology of intake and exhaust valves, and the early engine valve timing and valve lift cannot be adjusted. However, with the gradual improvement of VVT valve timing technology, many engines begin to use variable valve lift technology. The advantage of this technology is that the valve lift is used to control the air volume, which weakens the role of the throttle valve, greatly reduces the pumping loss, and correspondingly reduces the engine's intake lag phenomenon, thus improving the engine's response speed.

The general 2.0LLTG engine adopts an in-line four-cylinder design. In terms of engine ride comfort, the general 2.0LLTG engine adopts the balance shaft module, which is integrated at the lower end of the engine crankshaft, so the engine structure is more compact.

Generally, the variable displacement oil pump used in 2.0LLTG engine is vane pump, which provides different oil pressure according to different working conditions of the engine to reduce unnecessary power consumption. The vane pump used in LTG engine mainly provides different pressures by changing the size of the oil cavity through the slide valve. It has simple structure, large flow rate and convenient adjustment.

As for other technical details, whether it is piston spray cooling, hollow sodium-filled valve, intake and exhaust variable timing valve, these are the mainstream in the engine industry today. And with its amazing power output, it is no wonder that it can squeeze into the ranking of 20 13 Ward's top ten engines.

The general engineer optimized the cooling circuit of LTG engine, coupled with two-stage variable oil pump and various details optimization, which reduced the friction resistance of this engine by 16% and made this 2.0T engine run 1.7km per liter of oil.

LTG engine can be compatible with horizontal and vertical platforms, and it can appear on vertical rear-wheel drive and be installed on medium or large horizontal front-wheel drive vehicles owned by General Motors. Moreover, this engine is positioned as a Cadillac exclusive engine, and neither Chevrolet nor Buick will use it.

Engine installation model

Cadillac XTS, Cadillac ATS, Opel InsigniaSportsTourer

Million car purchase subsidy