Page 74 - Mechanic Diesel - TT

MECHANIC DIESEL - CITS

2 Fuel Efficiency: By optimizing valve timing, VVT systems can enhance fuel economy by ensuring more
efficient combustion.
3 Reduced Emissions: Enhanced combustion efficiency leads to lower emissions of harmful pollutants such as
nitrogen oxides (NOx) and hydrocarbons (HC).
4 Smooth Idle: VVT systems can help maintain smoother engine operation at idle by adjusting valve timing for
optimal combustion stability.

5 Flexibility: VVT allows for flexibility in engine design, enabling automakers to achieve a balance between
performance, efficiency, and emissions control.
Disadvantages:

1 Complexity: VVT systems add complexity to engine design and can increase maintenance and repair costs.
2 Reliability Concerns: Some early VVT systems faced reliability issues due to the complexity of the mechanisms
involved. However, modern VVT systems have improved significantly in reliability.

3 Cost: The additional components and technology required for VVT can contribute to higher manufacturing
costs, potentially increasing the price of vehicles equipped with this technology.
4 Oil Dependency: Some VVT systems rely on engine oil pressure for operation, meaning they may be sensitive
to oil quality and require regular maintenance to ensure proper function.
Overall, Variable Valve Timing offers significant benefits in terms of performance, efficiency, and emissions control,
although it comes with some trade-offs in terms of complexity and cost. However, advancements in technology
continue to improve the reliability and effectiveness of VVT systems.

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CITS : Automotive - Mechanic Diesel - Lesson 11 - 14 CITS : Automotive - Mechanic Diesel - Lesson 11 - 14