What is 4.2 v8?

4.2 V8 Engine Information

The 4.2 V8 engine is a family of aluminum alloy, naturally aspirated, gasoline-powered V8 engines produced by several manufacturers, most notably Audi and Jaguar. These engines are known for their relatively compact size, smooth power delivery, and distinctive exhaust note.

• Audi 4.2 V8: Audi's 4.2 V8 was widely used in various models, including the Audi S4, Audi RS4, Audi A6, Audi A8, and the Audi Q7. These engines typically featured five valves per cylinder (three intake, two exhaust) and utilized timing chains for camshaft drive. Power output varied depending on the specific model and year but generally ranged from around 300 to 450 horsepower. Notable variants include the high-revving unit found in the RS4.

• Jaguar 4.2 V8: Jaguar's 4.2 V8 was an evolution of their earlier 4.0 V8. It was used in models such as the Jaguar XK, Jaguar XJ, and Jaguar S-Type. The engine featured four valves per cylinder and was known for its refined power delivery and smooth operation. Supercharged versions were also available, significantly increasing power output.

• Engine Characteristics: Common traits of the 4.2 V8 include:

  • Aluminum Block and Heads: To reduce weight.
  • Double Overhead Camshafts (DOHC): For improved valve control and performance.
  • Sequential Fuel Injection: For precise fuel delivery and optimized combustion.

• Maintenance: Maintenance requirements for these engines can be relatively high, especially for the Audi variants with their complex timing chain systems. Regular oil changes, coolant flushes, and spark plug replacements are crucial. Timing chain issues can be a significant concern on high-mileage Audi 4.2 V8 engines.

• Performance: These engines provide strong acceleration and a rewarding driving experience. The combination of displacement, relatively lightweight construction, and advanced valve train technology results in a responsive and powerful engine.