Audi Audi RS4 2005-2008

Audi Audi RS4 2005-2008 4.2L Engine Specifications

Detailed technical specifications for the 4.2L V8 FSI engine in the 2005-2008 Audi RS4. Includes performance metrics, dimensions, and system-specific data for maintenance, diagnostics, and tuning.

Updated Oct 24, 2023

Overview Specifications

Comprehensive description of the 4.2l-engine specifications for the 2005-2008 Audi RS4, including key features, measurements, and technical details

How to Use

Use the search function to locate specific 4.2l-engine specifications by entering keywords such as 'torque', 'horsepower', or 'compression ratio'.

Navigate through the documentation sections using the table of contents or by scrolling through the major sections and subsections.

Key Specifications

Displacement

4.2 liters (4163 cc)

Maximum Power

420 hp (309 kW) at 7,800 rpm

Maximum Torque

430 Nm (317 lb-ft) at 5,500 rpm

Compression Ratio

12.5:1

Fuel Type

Premium unleaded (98 RON)

Available Specifications

Engine Design and Architecture

Details about the design, layout, and architecture of the 4.2l V8 engine used in the 2005-2008 Audi RS4

Engine Configuration

Naturally aspirated 4.2-liter V8 engine
90-degree cylinder bank angle
DOHC (Dual Overhead Camshaft) design
32-valve configuration (4 valves per cylinder)
Aluminum alloy block and cylinder heads

Combustion System

Direct fuel injection system
Compression ratio: 12.5:1
Bore: 84.5 mm
Stroke: 92.8 mm
Firing order: 1-5-4-8-6-3-7-2

Note: The high compression ratio contributes to improved thermal efficiency and power output.

Performance Specifications

Technical details about the engine's performance, including power output, torque, and fuel efficiency

Power and Torque

Maximum power: 420 hp (309 kW) at 7,800 rpm
Maximum torque: 430 Nm (317 lb-ft) at 5,500 rpm
Redline: 8,250 rpm
Power-to-weight ratio: 4.7 kg/hp

Fuel Efficiency

Fuel consumption (urban): 18.5 L/100 km
Fuel consumption (extra-urban): 9.6 L/100 km
Fuel consumption (combined): 12.7 L/100 km
Fuel type: Premium unleaded (98 RON)

Note: Fuel efficiency may vary based on driving conditions and style.

Cooling and Lubrication Systems

Information about the engine's cooling and lubrication systems, including fluid capacities and specifications

Cooling System

Liquid-cooled with an electric water pump
Coolant capacity: 12.5 liters
Radiator type: Aluminum cross-flow
Thermostat opening temperature: 87°C

Lubrication System

Wet sump lubrication system
Oil capacity: 9.0 liters (with filter)
Recommended oil grade: SAE 5W-40
Oil change interval: 15,000 km or 12 months

Note: Use only Audi-approved synthetic oil for optimal performance.

Emissions and Exhaust System

Details about the engine's emissions control and exhaust system design

Emissions Control

Complies with Euro 4 emissions standards
Dual catalytic converters
Lambda oxygen sensors for precise air-fuel ratio control
Exhaust gas recirculation (EGR) system

Exhaust System

Dual exhaust system with stainless steel mufflers
Exhaust pipe diameter: 70 mm
Backpressure: 0.25 bar at 7,000 rpm
Exhaust note tuned for performance and acoustics

Note: The exhaust system is designed to minimize backpressure while enhancing sound quality.

Search Specifications

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Engine Specifications

General

Engine Code: BNS

Displacement: 4.2L (4163 cc)

Configuration: V8

Cylinder Bore: 84.5 mm

Piston Stroke: 92.8 mm

Compression Ratio: 12.5:1

Engine Orientation: Longitudinal

Performance

Max Power: 420 hp @ 7800 rpm

Max Torque: 317 lb-ft @ 5500 rpm

Redline: 8250 rpm

Fuel System: Direct Fuel Injection (FSI)

Throttle Body: Electronic Throttle Control (ETC)

Fuel And Ignition

Fuel Type: Premium Unleaded (91+ RON)

injection Type: Direct Injection

Ignition System: Coil-on-Plug

Spark Plug Gap: 0.028-0.032 in (0.7-0.8 mm)

Fuel Pressure: 4.0-6.0 bar (58-87 psi)

Lubrication

Oil Capacity: 9.3 L (9.8 qt)

Oil Type: VW 502 00 / 505 00

Oil Pressure: 2.0-4.5 bar (29-65 psi) @ 2000 rpm

Oil Filter Part Number: 06E 115 562 B

Cooling

Coolant Capacity: 12.0 L (12.7 qt)

Coolant Type: G12++ (Pink)

Thermostat Opening Temp: 87°C (189°F)

Radiator Cap Pressure: 1.4 bar (20 psi)

Timing

Timing System: DOHC, Chain-Driven

Camshaft Phasing: Variable Valve Timing (VVT)

Timing Chain Tensioner Part Number: 079 109 507 AA

Timing Chain Service Interval: Inspect at 75,000 miles

Exhaust

Exhaust System Type: Dual Exhaust

Catalytic Converter Part Number: 8E0 254 701 C

Oxygen Sensor Part Number: 06A 906 262 A

Exhaust Gas Temperature Sensor Part Number: 06E 906 088 A

Maintenance

Spark Plug Replacement interval: Every 40,000 miles

Air Filter Replacement interval: Every 20,000 miles

Fuel Filter Replacement interval: Every 60,000 miles

Timing Chain Inspection Interval: Every 75,000 miles

Diagnostics

Obd2 Port Location: Under dashboard, driver's side

Common Fault Codes

P0300
P0171
P0420

Diagnostic Tool Compatibility: VCDS (VAG-COM)

Sensor Tolerances: Oxygen Sensor Voltage: 0.1-0.9 V
Coolant Temp Sensor Resistance: 200-300 ohms @ 20°C

Safety

Max Engine Temp: 120°C (248°F)

Oil Temp Warning Light: Activates at 150°C (302°F)

Coolant Temp Warning Light: Activates at 120°C (248°F)

Engine Shutdown Protocol: Activates at 130°C (266°F)

Service Information Service

Detailed service requirements and schedules for the 4.2L FSI engine

10,000

Oil and filter change
Inspect timing chain tensioner
Check coolant level and condition

Use only VW 502 00 / 505 00 approved oil

20,000

Replace air filter
Inspect spark plugs
Check fuel system for leaks

Inspect for carbon buildup on intake valves

40,000

Replace spark plugs
Inspect timing chain and guides
Replace cabin air filter

Use only OEM spark plugs

60,000

Replace fuel filter
Inspect exhaust system
Check engine mounts

Inspect for exhaust leaks and corrosion

75,000

Inspect timing chain and tensioner
Replace coolant
Check valve clearance

Timing chain inspection is critical at this interval

Common Questions

Find answers to common questions about torque specifications

What is the horsepower and torque output of the 4.2L FSI engine in the 2005-2008 Audi RS4?

The 4.2L FSI V8 engine in the 2005-2008 Audi RS4 produces 420 horsepower at 7,800 rpm and 317 lb-ft of torque at 5,500 rpm. This high-revving engine is designed for performance and features direct fuel injection (FSI) for improved efficiency and power delivery.

What is the recommended oil type and capacity for the 4.2L engine?

The 4.2L FSI engine requires fully synthetic oil meeting VW 502 00 or 505 00 specifications. The oil capacity is approximately 9.3 liters (9.8 quarts) with a filter change. Always use Audi-recommended oil to ensure optimal engine performance and longevity.

What is the service interval for the timing chain on the 4.2L engine?

The timing chain on the 4.2L FSI engine is designed to last the lifetime of the engine under normal operating conditions. However, regular inspections are recommended every 60,000 miles to check for wear, tension, and alignment. Failure to maintain the timing chain can lead to catastrophic engine damage.

What is the compression ratio of the 4.2L FSI engine?

The 4.2L FSI engine has a compression ratio of 12.5:1, which contributes to its high performance and efficiency. This high compression ratio requires the use of premium fuel (91 octane or higher) to prevent knocking and ensure proper operation.

What is the redline for the 4.2L FSI engine?

The redline for the 4.2L FSI engine is 8,250 rpm. This high-revving capability is a key feature of the engine's performance-oriented design, allowing for maximum power output and responsiveness.

Factory Service Resources

Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.

Audi RS4 4.2L FSI Engine Technical Specifications

Coming Soon

Detailed technical specifications for the 4.2L FSI engine, including horsepower, torque, compression ratio, and redline.

Audi RS4 Maintenance Schedule

Coming Soon

Official maintenance schedule for the 2005-2008 Audi RS4, including recommended service intervals for the 4.2L FSI engine.

Timing Chain Inspection and Replacement Guide

Coming Soon

Step-by-step guide for inspecting and replacing the timing chain on the 4.2L FSI engine, including safety precautions and tools required.

Audi RS4 Oil Change Procedure

Coming Soon

Detailed instructions for performing an oil change on the 4.2L FSI engine, including oil type, capacity, and filter replacement.

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Technical Information

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