Manifold header

Types of Manifold Header

Manifold headers are typically used in high-performance vehicles to boost the vehicle's power. The headers replace the factory exhaust manifold and utilize tuned piping to guide exhaust gases from the engine to the exhaust system. This process helps reduce back pressure and improve overall engine performance. There are several types of manifold headers, including:

• Shorty headers

  Shorty headers are a popular choice among manifold header buyers. They are designed to replace the factory exhaust manifold and offer a slight improvement in exhaust flow. The headers are characterized by their short length, as the tubes only extend a short distance from the engine block. This design helps improve low-end torque, making them a suitable choice for daily drivers and low-end torque enthusiasts. Shorty headers are also easier to install compared to other types of headers.

• Long tube headers

  Long tube headers are designed with longer primary pipes that extend further into the exhaust system. The design maximizes exhaust flow and helps reduce back pressure significantly. This feature makes long-tube headers a popular choice for racers and high-performance enthusiasts looking to increase horsepower and torque. However, the headers may need modifications to the vehicle for successful installation.

• Tri-Y headers

  Tri-Y headers are designed with a unique combination of primary tubes that merge into three Y-shaped collectors. This design helps enhance mid-range power and torque, making them an ideal choice for applications that require consistent power delivery. The headers are suitable for street performance, touring cars, and similar applications.

• Cast iron headers

  Cast iron headers are usually used in heavy-duty trucks and industrial engines. The headers offer durability and high resistance to corrosion and heat. They are designed to handle high-stress levels and extreme operating conditions associated with heavy-duty applications.

• Stainless steel headers

  Stainless steel headers are designed for high-performance applications. They offer superior corrosion resistance, high strength, and the ability to withstand high temperatures. The headers are typically constructed using austenitic stainless steel alloys, such as T304 and T321, known for their excellent high-temperature strength and oxidation resistance. Stainless steel headers also offer design flexibility, allowing for smoother bends and complex shapes, which can further optimize exhaust flow and enhance engine performance.

Specification and maintenance of manifold headers

There are several specifications that buyers should consider while shopping for exhaust headers.

• Type of material

  As mentioned earlier, exhaust headers come in different types of materials. Each material has its own advantages and disadvantages. For instance, steel headers are affordable. They are also strong and durable. However, they are prone to rust when exposed to moisture. On the other hand, stainless steel headers are strong and durable. They are also resistant to high temperatures and rust. But they are expensive compared to other types of materials.

• Size of the manifold header

  Another important specification to take into account is the size of the exhaust manifold. Headers come in different sizes. It is important to choose the right size that will fit the engine properly. A header that is too big or too small will not function well.

• Finish

  Exhaust headers also come in different finishes. The type of finish will affect how the header will look like and the level of corrosion it can withstand. Some of the common types of finishes include polished, painted and coated.

• Type of engine

  Different types of headers are designed for different types of engines. When buying, it is important to choose headers that are designed specifically for the type of engine one has.

Below are some maintenance tips for manifold headers

• It is important to carry out regular checks to see if there is any sign of damage or wear and tear on the headers. If there are any signs of damage, they should be addressed immediately.
• Another important maintenance tip is to keep the headers clean. Over time, dirt and grime may build up on the headers. This not only makes them look dirty but also affects their performance. A clean header will last longer and improve the performance of the vehicle.
• Another important thing to consider when maintaining exhaust headers is to ensure that all the bolts and nuts are tightly secured. Loose fittings can cause the headers to become loose, which can lead to damage.
• Periodically, the gaskets and flanges should be inspected to ensure that they are in good condition. In case of any sign of damage, the gaskets and flanges should be replaced immediately.

How to choose manifold headers

With so many manifold headers available, knowing what to look for can be difficult. Here are some tips.

• Material

  The material used to make the exhaust manifold headers must be considered. Each one has benefits and drawbacks. Cast iron headers are affordable and durable. On the downside, they are heavy and do not last long when rusting occurs. Stainless steel headers are strong and resistant to rust. They also handle high temperatures well. The only con is that they are expensive. Ceramic headers reduce the heat that comes from the header. They also prevent the header from getting rusty. Their downside is the brittle nature of the ceramic.

• Engine type

  The kind of engine in the vehicle will determine which headers to use. For instance, a V8 or V6 engine header is not going to fit in a 4-cylinder engine.

• Size and shape

  The size and shape of the manifold header pipe should be examined. It should fit well into the vehicle. A header that is too big or too small will affect performance. Furthermore, the size of the exhaust pipe must be compatible with the manifold header. The header and exhaust pipe will not connect if they are not the same size.

• Budget

  The amount of money allocated for purchasing a manifold header must be decided. They come in a range of prices depending on the material and brand. Setting a budget will help narrow down the options.

• Installation

  Consider how easy it will be to install the manifold header. Some require more work than others. A header that is simple to install will save time and money. This is because an expert mechanic will not be needed for installation.

How to DIY and Replace Manifold Headers

Replacing exhaust headers can be a DIY-friendly task. Below is a step-by-step guide on how to replace exhaust headers.

• Preparation

  Ensure that the right tools are available for the task. These include safety gear, hand tools, jacks, jack stands, ramps, and new header gaskets. Also, read the vehicle's repair manual to understand the process better. Park the car in a well-ventilated area and level ground. Allow the engine to cool down, and then disconnect the battery. Raise the car using the ramps or jack stands.

• Remove the old headers

  Remove any parts blocking access to the headers, such as the air intake. The next step is to drain the cooling system. Then, disconnect the exhaust pipes from the headers and unbolt the heat shield. Remove the header bolts and nuts and carefully take out the headers. It might be necessary to remove some other engine components to get more room to remove the headers.

• Install the new headers

  Clean the mounting surface and ensure the new headers fit well. Then, apply anti-seize lubricant on the header bolts. Position the new headers and fasten the bolts evenly to avoid warping. Reinstall other components that were removed during the process. Reconnect the exhaust pipes and install the heat shield. Refill the cooling system and ensure there are no leaks. Reconnect the air intake and disconnect the battery.

Q and A

Q1: What is the purpose of a manifold header?

A1: A manifold header serves as the connection point between the engine's exhaust ports and the exhaust system. Its purpose is to collect the exhaust gases from the engine and direct them into the exhaust system, ultimately leading to reduced emissions and improved engine performance.

Q2: What are the different types of manifold headers?

A2: There are several types of manifold headers, each designed to suit specific engine configurations and performance requirements. Some common types include shorty headers, long tube headers, and tri-y headers. Shorty headers are compact and ideal for vehicles with limited underhood space. Long tube headers provide better exhaust flow and are suitable for high-performance applications. Tri-y headers combine the benefits of both shorty and long tube headers, offering a balanced approach to exhaust scavenging.

Q3: What materials are used to make manifold headers, and what are their advantages?

A3: Manifold headers are typically made from stainless steel or mild steel. Stainless steel is corrosion-resistant, ensuring durability and longevity, especially in high-temperature and moisture-rich environments. Mild steel, on the other hand, is cost-effective and offers good weldability but may require additional coatings or treatments to prevent rust.

Q4: Can manifold headers be installed as a DIY project, or is professional installation recommended?

A4: While it is possible to install manifold headers as a DIY project, it requires a good understanding of automotive mechanics and access to the appropriate tools. Additionally, header installation involves working in a confined space, which can be challenging. For manifold header installation, professional help is recommended to ensure proper fitment, alignment, and torque specifications, minimizing the risk of exhaust leaks and potential engine damage.

Q5: Do manifold headers require any maintenance, and if so, what is involved?

A5: Manifold headers generally require minimal maintenance. However, periodic visual inspections are essential to check for signs of corrosion, cracks, or exhaust leaks. In case of any issues, timely repairs or replacements are necessary to maintain optimal engine performance and emissions control. Keeping the headers clean and free from excessive buildup can also contribute to their longevity and efficiency.