How Exhaust Flanges Function in a Vehicle

Most people do not understand the purpose of exhaust flanges, unless they have needed to replace one. Having a superficial understanding about what a flange does, can be very important to building or maintaining your vehicle. To start, you need to understand the purpose of the flange and where it is located within the vehicle.

What are Exhaust Flanges?

Exhaust flanges are a small but essential part to building a well functioning exhaust system. If you were to see a flange, it would be a small flat piece of metal that looks quite insignificant. However, this small piece of metal allows exhaust gases to flow without any obstruction in your car’s exhaust system. These flanges are important in connecting the exhaust manifold to an exhaust pipe. If the flange is not the correct flange for your make and model, there could potentially be an exhaust leak. A lot of flanges are meant to be used with a rubber gasket. As the flange is tightened into place with the rubber gasket, the flange squeezes the rubber. Once the rubber has been squeezed it creates a seal between the exhaust pipe and manifold. To make this as clear as can be, we need to pause and explain what an exhaust manifold and exhaust pipe does.

Exhaust Manifold, Pipe, and Flange

An exhaust manifold collects the car’s exhaust gases from multiple locations and centralizes them into one place. These manifolds are most often made out of stainless steel or a cast iron. After the exhaust gases reach the manifolds from multiple locations, the gas then exits the manifold through the exhaust pipe and then outside of your car.

The gas comes from the combustion of the engine. The manifold is essential in removing the exhaust gas out of the car’s system in order to provide room for more exhaust gas. The removal of gas from the cylinder is called scavenging. Scavenging occurs most often by pressure. These manifolds are designed in a way that the gases are extracted or sucked from the cylinder. Then, as mentioned above, the manifold will be the gateway for the gases to escape the car.

An exhaust pipe creates a clear path for your car’s exhaust gas to escape. This is important to keep your car running properly. Obstructed pipes can cause a lot of problems to keep your car from functioning the way it is supposed to.

Even though exhaust flanges are a small part of the exhaust system, they are essential to the system functioning properly. Without the correct flange, or even a well built flange, your car’s exhaust system may be compromised. The performance of your vehicle will be compromised if there is a leak in the exhaust system. These leaks can also cause hazard to the occupants of the vehicle. Exhaust gases are extremely toxic and dangerous. Quality flanges are essential to your vehicles performance and to your health and safety.

Finding the correct size flange should not be difficult. Also, finding a quality flange should be one of your top priorities when looking for a replacement. Hells Gate Hot Rods offers excellent flanges for many makes and models.

What does Hells Gate Hot Rods offer?

Hells Gate Hot Rod offers numerous exhaust flanges for your needs. These flanges are designed on CAD to create a perfect fit and seal. This fit and seal is essential to your vehicle running efficiently and to avoid any hazards from the toxic exhaust gas.

When you order flanges from Hells Gate Hot Rods you will receive one pair of flanges. After being designed on CAD for ultimate precision, they are then taken to the CNC High Definition plasma cutter to maintain this precision. The steel used is ⅜” Pickled and Oiled steel. This type of steel is a hot rolled steel that is easy to clean and maintain. Pickling removes any impurities from the steel. Then when it is oiled it will prevent the steel from having any corrosion. These two processes will create a clean flange that will be corrosion resistant. Having this type of steel will create a flange that lasts longer and withstands the harsh environment under the hood.

Many flanges are offered so that you can have the perfect fit for your needs. If you need help determining which flange is correct for your vehicle, don’t hesitate to call Hells Gate Hot Rods. The following are the numerous flanges they have available at Hells Gate Hot Rods:

  • Buick (Nailhead 264-322, Nailhead 364-425, Straight 8 248-263, Straight 8 320)
  • Cadillac (Cadillac 331 (Early), Cadillac 331 (Late), Cadillac 365-429, Cadillac Big Block 425-500)
  • Chevrolet (Chevrolet 348-409, Chevrolet 4.3L V6, Chevrolet Big Block 396-454 (2.25” Round Port), Chevrolet Big Block 396-454, Chevrolet Early 6 cyl 216-261, Chevrolet Late 6 cyl 194-292, Chevrolet LS1-LS6, Chevrolet Small Block 265-400 (Rectangle Port)
  • Chrysler (Chrysler Hemi 331-392, Chrysler Poly 301-354)
  • DeSoto (Desoto Hemi 276-345)
  • Dodge (Dodge A Series 277-326, Dodge Hemi 241-325)
  • Ford (Ford 351C, 351M, 400, Ford Big Block 429-460, Ford FE 332-390, Ford Flathead 221-239, Ford Flathead V8-60, Ford Model A,B, Ford Small Block 221-351W, Ford Y-Block 239-312)
  • Mopar (Mopar Big Block 350-440, Mopar Slant 6 170-225, Mopar Small Block 318-360, Mopar Small Block W-2)
  • Oldsmobile (Oldsmobile 238, Oldsmobile 303, Oldsmobile 324-374 (Split Port), Oldsmobile 324-374, Oldsmobile Big Block 350-455)
  • Pontiac (Pontiac 326-455)

How to replace an Exhaust flange?

Now that you have your exhaust flanges, what are you going to do with them? Knowing how to replace the flanges can be a simple process. Here, we are going to offer a few steps to replacing these flanges. Do It Yourself has created a simple five step instruction on how to replace an exhaust flange. Once you have purchased your plan, you can follow this simple process to replace your old or warped flange:

  1. Locate the bolts-These bolts can easily be found once the car is jacked up. These bolts will be located on the exhaust port.
  2. Remove the bolts-You should remove all the bolts, except the two bolts that are on both sides of the header.
  3. Loosen the exhaust flange and gasket-This flange may be stuck. In order to remove it you may have to use a knife or another flat piece of metal to pry the flange off. If a rubber gasket has been used, you may have to scrape off all the rubber to make sure there is a proper seal. Some cars will have only a flange, while other cars will have a flange gasket and a flange.
  4. Remove the flange-Make sure that every piece of the gasket has been removed, if there is a gasket. This will allow for a proper fit.
  5. Replace the flange-Once the flange and flange gasket has been removed, then replace them assuring that the seal is proper. After this you can insert the bolts and tighten them back to their original state.

Following these simple steps can allow you to change most flanges. The flange is an essential part to your vehicle, even though it seems insignificant. Finding the correct flange for your vehicle is important. Looking to Hells Gate Hot Rods, will allow you to find the correct size of flange and a flange that is CAD designed out of excellent materials.