Custom EGR Exhaust Pipe Manufacturer & Supplier

HEYA METAL | Custom Automotive Exhaust Parts Manufacturer Since 1994

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Your Trustful EGR Pipe Supplier

HEYA METAL has been a leading manufacturer of automotive exhaust and related components since 1994, with a proven track record as an OEM supplier to Honda and Toyota since 2006. We specialize in producing high-quality exhaust clamps, EGR pipes, intake pipes, exhaust tips, and special-shape pipes that meet exacting industry standards. As an IATF 16949 certified manufacturer, we offer both standard OEM replacements and after-sales market solutions tailored to specific vehicle requirements. Contact us today to request a free quote or more information.

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Advantages of EGR Pipe

Significantly reducing nitrogen oxide (NOₓ) emissions

This is its core and most important advantage, and one of the key technologies to meet increasingly stringent environmental regulations.

Improving fuel economy under partial load

By reducing pumping losses and enabling a higher compression ratio, the EGR system can save fuel under specific operating conditions.

Reducing pumping losses (for gasoline engines)

At partial load, the throttle valve opening is small, and the piston needs to overcome significant vacuum resistance when moving downward to draw in air—this wastes energy (referred to as pumping losses). Introducing exhaust gas can reduce the required throttle opening, thereby lowering these losses and improving fuel economy.

Reducing knock tendency

Lowering the combustion temperature can suppress knock (commonly known as "engine pinging") in gasoline engines, allowing engineers to design a higher compression ratio to improve the engine’s thermal efficiency.

Core Working Principles

The core purpose of the EGR (Exhaust Gas Recirculation) system is very clear: to lower the temperature of the combustion chamber, thereby suppressing the formation of nitrogen oxides (NOₓ). The basic working process is as follows:

Exhaust Gas Extraction

When the engine is operating under medium-load conditions (e.g., constant-speed cruising), the EGR valve opens under the control of the Electronic Control Unit (ECU).

Exhaust Gas Delivery

A portion of the exhaust gas emitted by the engine (usually 5%-15%) is directed to the intake manifold through the EGR pipe.

Mixing and Recirculation

This portion of exhaust gas mixes with fresh air and fuel to form a mixture.

Entry into the Cylinder

The mixture is drawn into the cylinder to participate in combustion.

Application scenarios

Gasoline passenger vehicles

EGR systems are almost standard equipment in modern gasoline vehicles, used to meet environmental regulations.

Diesel vehicles (commercial and passenger)

Diesel engines operate with a high excess air ratio and high combustion temperature, making them a major source of NOₓ emissions. Therefore, EGR systems are crucial for diesel engines.

Natural gas engines

These engines also face NOₓ emission issues and require technologies like EGR for control.

Motorcycles

Some high-end motorcycles or those complying with the latest emission standards have also begun to adopt EGR systems.

Non-road mobile machinery

This includes construction machinery, agricultural machinery, marine engines, etc. As long as they use internal combustion engines and their emissions are regulated by laws, they may be equipped with EGR systems.

Manufacturing Process

Raw Materials

The material of each batch will be confirmed, and the material performance will be tested to ensure that the correct materials meeting the requirements are used.

Pipe Manufacturing

The continuous pipe manufacturing production equipment can carry out welding processing for plate thicknesses of 0.15-2.5 mm and pipe diameters of 25-76 mm.

Forming

The independently developed internal high-pressure forming equipment uses water for internal high-pressure forming, which can smoothly carry out physical deformation on the product without damaging the material. It has the characteristics of special-shaped deformation processing, environmental protection, and high efficiency.

Assembly

The independently developed robot workstation is used for assembly and welding to ensure the stability of product quality.

Leakage Testing

100% immersion testing.

Final Inspection/Packaging

The main installation dimensions are fully inspected at 100% to ensure that no defective products flow out.

Test items & standards

Cross-Sectional Dimension Inspection

Purpose: To inspect bellows-related data, including the thickness error rate after forming and the weld penetration depth.
Testing Equipment: Coordinate Measuring Machine (CMM) / Profile Projector / Metallurgical Microscope

Full-Size Product Inspection

Purpose: Inspect all dimensions of the product in accordance with the product drawing to ensure all data meet customer requirements.

Material Physical Property Inspection

Purpose: To test the elongation and tensile strength of the material.
Testing Equipment: Universal Tensile Testing Machine

Weld Strength Inspection

Purpose: Through tensile tests / destructive tensile tests, verify whether the weld strength is sufficient, whether the weld penetration meets requirements, and whether there are air holes in the weld structure.
Testing Equipment: Tensile Testing Machine / Profile Projector

Corrosion Resistance Test

Purpose: To verify the surface corrosion resistance of bellows when exposed to salt spray conditions for a long time.
Testing Equipment: Salt Spray Test Chamber

Air Tightness Inspection

Purpose: The air tightness test aims to verify whether there is leakage in the bellows and its connection parts, ensuring sealing performance and reliability under pressure conditions.
Testing Equipment: (Test method: Fill the bellows with gas of a certain pressure, such as air or nitrogen, and judge the sealing performance by detecting pressure drop or air bubble leakage.)

why choose us

The EGR system is not merely a simple valve or pipe; it is a high-tech assembly integrating innovative design, cutting-edge materials, precision manufacturing, and strict quality requirements. Its value is reflected in the following aspects:

Environmental Value: It serves as a key technical cornerstone for internal combustion engines to meet global emission regulations.

Economic Value: By improving thermal efficiency and reducing pumping losses, it delivers tangible fuel economy benefits to end-users.

Engineering Value: The level of its design, manufacturing, and quality management represents an enterprise’s comprehensive engineering capabilities in precision machining, thermal management, and system integration.

Quality Management: Strict control throughout the entire process ensures delivery with zero defects.

Production Manufacturing: Relying on advanced processes to achieve precision manufacturing of complex products.

Production Technology: Driven by technology, with equal emphasis on environmental protection and efficiency; the entire production process is scientifically designed and features high technological content.

Therefore, a mature and reliable EGR system is a crucial guarantee for engines to strike an optimal balance among environmental friendliness, efficiency, and performance. Behind it, the design, manufacturing, and quality management systems are equally vital.