Audi Audi S4 2003-2008

Audi Audi S4 2003-2008 4.2L Engine Specifications

Detailed technical specifications and documentation for the 4.2L V8 engine in the 2003-2008 Audi S4. Includes performance metrics, system details, and maintenance guidelines.

Updated Oct 24, 2023

Overview Specifications

Comprehensive description of the 4.2l-engine specifications for the 2003-2008 Audi S4, 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 (4172 cc)

Max Power

339 hp @ 7000 rpm

Max Torque

302 lb-ft @ 3500 rpm

Compression Ratio

11.0:1

Oil Capacity

8.5 liters (9.0 quarts)

Available Specifications

Engine Design and Configuration

Details about the design, layout, and configuration of the 4.2l V8 engine

Engine Layout

90-degree V8 configuration
Aluminum alloy block and cylinder heads
DOHC (Dual Overhead Camshaft) design
32-valve setup (4 valves per cylinder)
Chain-driven camshafts

Displacement and Dimensions

Displacement: 4.2 liters (4172 cc)
Bore: 84.5 mm
Stroke: 92.8 mm
Compression ratio: 11.0:1
Engine weight: ~190 kg (419 lbs)

Note: The lightweight aluminum construction contributes to improved performance and handling.

Performance Specifications

Technical details about the engine's power output, torque, and performance characteristics

Power and Torque

Maximum power: 339 hp @ 7000 rpm
Maximum torque: 302 lb-ft @ 3500 rpm
Redline: 7200 rpm
Power-to-weight ratio: ~5.5 lb/hp
Fuel delivery: Multi-point fuel injection

Performance Metrics

0-60 mph: 5.6 seconds
Top speed: 155 mph (electronically limited)
Fuel economy: 15 mpg city / 22 mpg highway
Emissions: Meets Euro 4 standards

Note: Performance figures may vary slightly depending on transmission type and driving conditions.

Cooling and Lubrication Systems

Information about the engine's cooling and lubrication systems

Cooling System

Liquid-cooled with a high-capacity radiator
Dual electric cooling fans
Coolant capacity: 12.5 liters (13.2 quarts)
Thermostat opening temperature: 87°C (189°F)
Coolant type: G12 or equivalent

Lubrication System

Wet sump oil system
Oil capacity: 8.5 liters (9.0 quarts) with filter
Recommended oil grade: 5W-40 synthetic
Oil pressure: 2.0-4.5 bar at 2000 rpm
Oil change interval: 10,000 miles or 12 months

Note: Regular oil changes are critical to maintaining engine performance and longevity.

Ignition and Fuel Systems

Details about the ignition and fuel delivery systems

Ignition System

Direct ignition system with individual coils
Spark plug gap: 0.8 mm
Spark plug type: NGK PFR6Q or equivalent
Ignition timing: Fully electronic control
Recommended replacement interval: 60,000 miles

Fuel System

Multi-point fuel injection (MPFI)
Fuel pressure: 4.0 bar (58 psi)
Fuel tank capacity: 70 liters (18.5 gallons)
Fuel type: Premium unleaded (91 octane or higher)
Fuel filter replacement interval: 40,000 miles

Note: Using lower octane fuel may result in reduced performance and efficiency.

Search Specifications

Search by specification name, value, or description

Engine Specifications

General

Engine Type: V8

Displacement: 4.2L (4163 cc)

Bore: 84.5 mm

Stroke: 92.8 mm

Compression Ratio: 12.0:1

Engine Code: BHF/BNS

Performance

Power: 344 hp @ 7000 rpm

Torque: 302 lb-ft @ 3500 rpm

Redline: 7200 rpm

Fuel System: Multipoint Fuel Injection (FSI)

Fuel Specifications

Fuel Type: Premium Unleaded (91 octane or higher)

Fuel Tank Capacity: 16.6 gallons

Fuel Pressure: 4.0 bar (58 psi)

injector Part Number: 06E906031A

Cooling System

Coolant Capacity: 11.3 liters

Thermostat Opening Temp: 87°C (189°F)

Radiator Part Number: 8E0121251J

Coolant Type: G12++ (pink)

Lubrication System

Oil Capacity: 8.5 liters

Oil Type: VW 502 00 / 505 00

Oil Pressure: 2.0-4.5 bar at 2000 rpm

Oil Filter Part Number: 06B115562B

Ignition System

Spark Plug Gap: 0.8 mm

Spark Plug Torque: 30 Nm

Spark Plug Part Number: 101905621B

Ignition Coil Part Number: 06E905115E

Exhaust System

Exhaust Manifold Material: Stainless Steel

Catalytic Converter Part Number: 8E0254805B

Exhaust Pipe Diameter: 70 mm

Timing System

Timing Chain Type: Dual Overhead Camshaft (DOHC)

Timing Chain Tensioner Part Number: 079109507A

Camshaft Adjustment Range: 42°

Maintenance Intervals

Oil Change: 10000 miles or 12 months

Spark Plugs: 60000 miles

Timing Chain Inspection: 100000 miles

Coolant Flush: 50000 miles or 5 years

Diagnostic Specifications

Engine Control Unit Part Number: 8E0907551A

Obd2 Protocol: ISO 15765-4 CAN

Common Fault Codes

P0300
P0420
P0171

Diagnostic Tool: VAS 5054A

Service Information Service

Detailed service requirements and schedules for the 4.2L engine

10000

Oil and filter change
Inspect brake system
Check coolant level

Use only VW 502 00 / 505 00 certified oil

60000

Replace spark plugs
Inspect timing chain
Inspect air filter

Timing chain inspection is critical for longevity

100000

120

Inspect and replace timing chain if necessary
Replace coolant
Inspect all hoses and belts

Timing chain replacement may be required if noise is present

Common Questions

Find answers to common questions about torque specifications

What is the horsepower and torque output of the 4.2L V8 engine in the 2003-2008 Audi S4?

The 4.2L V8 engine in the 2003-2008 Audi S4 produces 340 horsepower at 7,000 RPM and 302 lb-ft of torque at 3,500 RPM. This naturally aspirated engine features a 90-degree V-angle and a dual overhead camshaft (DOHC) design.

What is the recommended oil type and capacity for the 4.2L V8 engine?

The 4.2L V8 engine requires fully synthetic oil meeting VW 502 00 or 505 00 specifications. The oil capacity is approximately 8.5 liters (9 quarts) with a filter change. Always use Audi-approved oil to ensure optimal performance and longevity.

What is the timing system configuration for the 4.2L V8 engine?

The 4.2L V8 engine uses a timing chain system with four chains: two primary chains and two secondary chains. The timing chains are located at the rear of the engine, requiring significant disassembly for service. Regular maintenance is critical to prevent timing chain tensioner failure.

What is the compression ratio of the 4.2L V8 engine?

The 4.2L V8 engine has a compression ratio of 11.0:1, which contributes to its high-performance output and efficiency. This ratio is optimized for premium unleaded fuel with an octane rating of 91 or higher.

What are common issues with the 4.2L V8 engine in the Audi S4?

Common issues include timing chain tensioner failure, carbon buildup on intake valves, and oil consumption due to worn piston rings. Regular maintenance, including oil changes and carbon cleaning, is essential to mitigate these problems.

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 4.2L V8 Engine Service Manual

Coming Soon

Official service manual for the 4.2L V8 engine, covering maintenance, repair procedures, and technical specifications.

Timing Chain Replacement Guide

Coming Soon

Step-by-step guide for replacing the timing chains and tensioners on the 4.2L V8 engine, including tools and safety precautions.

Carbon Cleaning Procedure

Coming Soon

Detailed instructions for performing a carbon cleaning service on the 4.2L V8 engine to restore performance and reduce emissions.

Oil Change and Maintenance Schedule

Coming Soon

Recommended oil change intervals and maintenance tasks for the 4.2L V8 engine to ensure reliability and longevity.

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Technical Information

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