BMW 640i 2011-2018

BMW 640i 2011-2018 Exhaust Specifications

Detailed technical specifications for the 2011-2018 BMW 640i exhaust system, including OEM part numbers, torque settings, and performance details. Ideal for technicians and enthusiasts.

Updated Oct 24, 2023

Overview Specifications

Comprehensive description of the exhaust specifications for the 2011-2018 BMW 640I, including key features, measurements, and technical details. This section provides detailed information on the exhaust system's design, components, and performance specifications.

How to Use

Use the search function to locate specific exhaust specifications by entering keywords such as 'catalytic converter', 'muffler', or 'exhaust pipe diameter'.

Navigate through the exhaust documentation sections by selecting the desired section from the table of contents or using the next/previous buttons to move sequentially.

Key Specifications

Exhaust Pipe Diameter

60 mm

Catalytic Converter Efficiency

>95%

Muffler Weight

6.2 kg

Exhaust System Length

3.2 meters

Operating Temperature Range

300°C to 800°C

Available Specifications

Exhaust System Overview

This section provides an overview of the exhaust system, including its components, layout, and primary functions.

Exhaust System Components

Dual exhaust system with two tailpipes
Stainless steel construction for durability
Integrated catalytic converters for emissions control
Resonator and muffler for noise reduction
Exhaust tips with chrome finish

Exhaust Layout

Exhaust pipes routed along the undercarriage
Dual-branch design for optimized flow
Oxygen sensors located before and after the catalytic converters
Flexible joints to accommodate engine movement
Heat shields for thermal protection

Note: The exhaust layout is designed to minimize backpressure and maximize performance.

Exhaust Pipe Specifications

This section details the dimensions, materials, and technical specifications of the exhaust pipes.

Pipe Dimensions

Main pipe diameter: 60 mm
Tailpipe diameter: 80 mm
Wall thickness: 1.5 mm
Total length of exhaust system: 3.2 meters
Bend radius: 150 mm

Material and Construction

Material: 304-grade stainless steel
Welding type: TIG welding for precision
Corrosion-resistant coating applied
Weight: 18.5 kg (entire system)
Heat tolerance: up to 900°C

Note: The stainless steel construction ensures longevity and resistance to rust.

Catalytic Converter Specifications

This section covers the technical details of the catalytic converters, including their design and performance metrics.

Catalytic Converter Design

Type: Three-way catalytic converter
Substrate material: Ceramic honeycomb
Coating: Platinum, palladium, and rhodium
Cell density: 400 cells per square inch
Dimensions: 150 mm diameter, 300 mm length

Performance Metrics

Efficiency: >95% reduction in harmful emissions
Operating temperature range: 300°C to 800°C
Backpressure: <0.5 bar at full load
Lifespan: 160,000 km under normal conditions
Compliance: Euro 5 and Euro 6 standards

Note: The catalytic converters are designed to meet stringent emissions regulations.

Muffler and Resonator Specifications

This section provides details on the muffler and resonator, including their construction and acoustic performance.

Muffler Design

Type: Chambered muffler
Material: Aluminized steel
Internal baffles for noise reduction
Dimensions: 400 mm x 250 mm x 150 mm
Weight: 6.2 kg

Resonator Specifications

Type: Helmholtz resonator
Material: Stainless steel
Dimensions: 200 mm diameter, 500 mm length
Acoustic tuning frequency: 120 Hz
Weight: 3.5 kg

Note: The resonator is tuned to reduce specific frequencies for a smoother exhaust note.

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Component Specifications

General Specifications

Material: Stainless steel

System Type: Dual exhaust with dual tailpipes

Emission Standard: EU5

Part Number: 18307585210

Weight: 22.5 kg

Exhaust Manifold

Material: Cast iron

Part Number: 11627559572

Bolt Torque: 25 Nm

Gasket Part Number: 11627559573

Heat Shield Material: Aluminized steel

Catalytic Converter

Type: Three-way catalytic converter

Part Number: 18307585211

Substrate Material: Ceramic

Precious Metals

Platinum
Palladium
Rhodium

Operating Temperature: 400-800 °C

Efficiency: >95%

Oxygen Sensors

Upstream Sensor Part Number: 11787558023

Downstream Sensor Part Number: 11787558024

Operating Voltage: 0.1-0.9 V

Response Time: <100 ms

Replacement interval: 100,000 miles

Muffler

Material: Stainless steel

Part Number: 18307585212

internal Baffles: Perforated tube design

Noise Reduction: 25 dB

Mounting Bracket Torque: 40 Nm

Tailpipes

Material: Stainless steel

Diameter: 80 mm

Finish: Chrome-plated

Part Number: 18307585213

Alignment Tolerance: ±2 mm

Exhaust Flanges

Material: Stainless steel

Gasket Part Number: 18307585214

Bolt Torque: 30 Nm

Sealing Type: Metal gasket with graphite coating

Exhaust Hangers

Material: Rubber with steel core

Part Number: 18307585215

Load Capacity: 15 kg

Replacement interval: Inspect every 50,000 miles

Exhaust Clamps

Material: Stainless steel

Part Number: 18307585216

Torque Specification: 20 Nm

Replacement interval: Inspect every 30,000 miles

Diagnostic Specifications

Backpressure Limit: <0.5 bar

Oxygen Sensor Diagnostic Codes

P0130
P0135
P0141

Catalytic Converter Efficiency Codes

P0420
P0430

Exhaust Leak Detection Method: Smoke test

Service Information Service

Detailed service requirements and schedules for the exhaust system

30,000 miles

24 months

Inspect exhaust system for leaks
Check oxygen sensor operation
Inspect hangers and clamps

Replace any damaged components immediately

60,000 miles

48 months

Replace oxygen sensors
Inspect catalytic converter
Check muffler and tailpipes for corrosion

Use OEM parts for replacements

100,000 miles

84 months

Replace catalytic converter if efficiency is below 95%
Inspect and replace exhaust manifold gasket if necessary
Check exhaust system alignment

Perform a full diagnostic scan for error codes

Frequently Asked Questions

Find answers to common questions about torque specifications

What is the exhaust system configuration for the 2011-2018 BMW 640i?

The 2011-2018 BMW 640i features a dual exhaust system with a single turbocharger. The system includes two catalytic converters, one for each bank of the inline-6 engine, and a muffler with dual tailpipes. The exhaust pipes are made of stainless steel with a diameter of 60mm.

What is the backpressure specification for the exhaust system?

The backpressure for the 2011-2018 BMW 640i exhaust system should not exceed 0.5 psi at idle and 2.5 psi at 2500 RPM. Exceeding these values may indicate a blockage or restriction in the exhaust system.

What type of catalytic converter is used in the 640i?

The 2011-2018 BMW 640i uses a metallic substrate catalytic converter with a 400 cells per square inch (cpsi) design. The converters are designed to meet Euro 5 emissions standards and are integrated into the exhaust manifolds.

Can aftermarket exhaust systems affect the vehicle's warranty?

Yes, installing an aftermarket exhaust system may void the warranty on related components, such as the engine or emissions system, if the modification is deemed to have caused a failure. Always consult your BMW dealership before making modifications.

What is the recommended service interval for the exhaust system?

BMW recommends inspecting the exhaust system every 30,000 miles or 24 months, whichever comes first. This includes checking for leaks, corrosion, and ensuring all mounting points are secure.

What is the torque specification for exhaust manifold bolts?

The exhaust manifold bolts on the 2011-2018 BMW 640i should be torqued to 18 Nm (13.3 lb-ft) in a crisscross pattern to ensure even pressure distribution and prevent leaks.

Factory Service Resources

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

BMW 640i Exhaust System Technical Manual

Coming Soon

Official BMW technical manual detailing the exhaust system components, specifications, and maintenance procedures for the 2011-2018 640i.

Exhaust System Inspection Checklist

Coming Soon

A step-by-step guide for inspecting the exhaust system, including common issues and troubleshooting tips for the 2011-2018 BMW 640i.

Genuine BMW Exhaust Parts Catalog

Coming Soon

Catalog of genuine BMW exhaust components, including part numbers, pricing, and compatibility information for the 2011-2018 640i.

Exhaust System Warranty Information

Coming Soon

Detailed information on BMW's warranty coverage for the exhaust system, including limitations and exclusions for the 2011-2018 640i.

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