Inlet Manifold BMW E36 E38 E39 E46 M52 Petrol Intake DISA Adjuster Unit 1440049

Inlet Manifold BMW E36 E38 E39 E46 M52 Petrol Intake DISA Adjuster Unit is an original intake system component designed for BMW M52 family petrol engines, used in 3, 5, and 7 series models. It is responsible for precise control of the intake manifold runner length, which affects engine refinement, flexibility, and torque stability. Thanks to its factory design, the Inlet Manifold BMW E36 E38 E39 E46 M52 Petrol Intake DISA Adjuster Unit ensures proper integration with the engine electronics and maintains factory performance parameters.

Specifications and technical data

• SKU: 1440049
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 1440049
• Substitutable numbers: 11611440049, 1440049, 11611432557, 1432557
• Fuel type: Petrol
• Category: Intake Manifolds

Function of the DISA valve in a BMW petrol engine

The DISA valve in the intake manifold controls airflow depending on engine load and speed. In practice, this means:

• variable intake runner length for better cylinder filling,
• more efficient power delivery in the mid-RPM range,
• more stable engine idle,
• more predictable throttle response under typical driving conditions.

In BMW M52 petrol engines, a properly functioning DISA valve is essential for maintaining factory torque characteristics and correct engine management system operation.

Compatibility and fitment for the intake manifold

The presented component belongs to the Intake manifolds group, which means it works directly with the factory intake manifold in M52 units. The valve design is prepared for installation in the original manifold housing, maintaining proper positioning and system sealing.

Thanks to the use of an OEM solution, the DISA valve is adapted to the factory engine control unit parameters, which reduces the risk of diagnostic errors and incorrect adaptation. This is a practical solution when replacing a worn component in BMW E38, E39, and E46 series vehicles with a petrol engine.

Performance characteristics of the used component

The offered DISA valve comes from dismantling, which allows for cost-effective repair of the intake system while maintaining the original specification. A used component of this type is often chosen as an alternative to new aftermarket replacements, especially for older BMW generations, where reasonable service costs are important while maintaining the factory design.

Replacing the DISA valve is recommended in situations where symptoms such as rough idling, loss of flexibility in the mid-RPM range, or incorrect mixture adaptation values occur. Installing a functional component restores proper airflow in the manifold and stabilizes the petrol engine's operation.

Application in BMW service and diagnostics

In workshop practice, the DISA valve is one of the most frequently diagnosed components in the M52 engine intake system. Its condition affects:

• proper control of intake runner length,
• cooperation with airflow sensors and the ignition system,
• overall refinement of the petrol engine in the low and mid-RPM range.

Selecting the original DISA valve for a specific BMW model is facilitated by the manufacturer's markings and available interchangeable numbers, which allow for verifying compatibility with a given intake manifold and engine version.

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other components from the same group, such as throttle bodies, control flaps, or additional intake modules, check the available parts in the BMW Intake manifolds category.

Technical support and additional information

When selecting intake and exhaust system components for BMW cars, technical materials regarding exhaust and airflow can be helpful. If you want to better understand the relationships between the manifold, the control valve, and the rest of the system, it is worth reading the guide on modifications and selecting used components – details can be found in the article Performance exhaust system: used manifolds and sports catalytic converters on the road.