![]() ![]() Just make sure that your collector pipes are not constricted because that defeats their purpose. This ensures that the gases reach the collector separately from each cylinder along with the right exhaust scavenging characteristics. The tubes on a header connect to a collector pipe, which is equal in length and smooth. Headers are a popular aftermarket part, and they are constructed using stainless steel tubes for each cylinder which makes it highly effective for gases to exit. Thicker walls reduce efficiency and performance.Cast manifolds are heavy, and thick, meaning less room for exhaust gases to pass through. This could ultimately result in a loss in horsepower and efficiency to allow fresh air in. Because the gas flow slows down, a manifold can cause backpressure, and that prevents the exhaust from efficient clearing. The iron casting also makes the interior rough, which can result in the flow of exhaust gases slowing down. However, the downside of having thick walls is that they leave little space for exhaust gasses to pass through. They’re thicker, sturdier, and more durable. Most cars have manifolds installed from factory. The only problem with cast iron is that it is prone to cracking. ManifoldsĪn exhaust manifold is made from cast iron which makes it capable of withstanding high heat and pressure from exhaust gases. Which one you end up choosing depends on what you plan on doing with your car. The main difference lies in the way they sound and perform. Whether you are looking at an exhaust manifold or headers, they will always have one inlet per cylinder.Įven though both perform the same function, there are a few key differences between manifolds and headers. Its sole purpose is to transfer the exhaust gases from the engine to the rest of your exhaust system, where they can be expelled. In order to collect the exhaust gas from all eight cylinders into one single pipe, we need an exhaust manifold. The word manifold is derived from an Old English word, “ manigfeald” which refers to the folding together of multiple inlets and outlets.Ĭonsider that an eight-cylinder engine has eight outlets –– one for each cylinder. Exhaust Manifolds and Headers: What’s the Difference?Įxhaust manifolds are often confused with headers because both components serve the same purpose. In this guide, we’ll explain how exhaust manifolds and headers differ and which one suits your needs the most. When your engine expels exhaust gases, they are first sent to your manifold, and then to the rest of the exhaust system. If this cycle is interrupted, your engine will not work headers and manifolds come in at the last stage of this cycle. Typically street driven V8 car applications from 250-400hp use a 1-5/8", 400-500hp use 1-3/4", 500-700hp use 1-7/8" and 700+hp use 2".Induction, compression, combustion, and exhaust - the never-ending cycle that keeps the heart of all internal combustion engines running. For higher HP and max-effort engines in the same vehicle, choose a mid or large size tube diamater as available. For stock to mild performance engines intstalled in a truck or heavy vehicle, choose a header tube diameter on the smaller end of the available offerings. Hooker headers are produced in multiple tube diameter ranges known to be effective and popular for the intended engine/vehicle application. ![]() For example, small block Chevy applications can benefit from using 1-1/2" to 2" primary tubes depending on the displacement, compression ratio and power band of the engine and the weight, gearing, tire size and usage scenario of the application vehicle. Headers are commonly available with multipe tubing diameter options in order to accommodate different levels of performance from a common engine type. Microswitch and Solenoid Mounting Bracketsĭescribes the outside diameter of the header primary tubes.Distribution Blocks, Filters, Adapters and Fittings. ![]()
0 Comments
Leave a Reply. |