![]() ![]() Remember the exhaust stroke? We mentioned how the engine must expel gasses to increase performance quickly. How does the Scavenging Effect Increase Performance?īackpressure is yet another term that car and tuning fans casually throw around in discussions, and we bet you’ve already heard the people say things like: “Your Exhaust is too open you’ll lose backpressure.” We are here to clear up any confusion once and for all. Watch it in action in the interesting video by CorkSport Mazda Performance below. The faster the gasses can flow, the more pronounced this phenomenon becomes. This low pressure creates a vacuum effect within the manifold. The faster these pulses can travel through the system, the higher the pressure in front of the pulse and the lower pressure behind it. The unrestricted airflow leads to a much higher-speed exhaust pulse that flows freely down the exhaust system. Scavenging means “to collect,” and when talking about exhaust headers, scavenging pertains to the header’s ability to create a vacuum effect that pulls out the gasses from the cylinder and by extension, pulls in fresh air into the cylinder.Ī free-flowing header will allow the engine to expel exhaust gasses much faster, leading to higher air velocity as gasses escape the exhaust system. Now that you have a better idea of how the exhaust cycle works in an internal combustion engine, we’ll look at what scavenging means for exhaust headers, which should set you up nicely as you learn about the different types of headers in the next section. ![]() Don’t worry, we’ll explain what it means shortly. You might hear the term scavenging thrown around now and then when members of the car community talk about their header upgrades. However, due to various environmental restrictions enforced in different countries, exhaust systems in modern vehicles are generally designed to keep noise, heat, and emissions to a minimum, affecting the overall performance and, of course, that sweet exhaust note that car fans crave. Once the Intake, Compression, and Power cycle are complete, the fresh air that entered the cylinder will be reduced to exhaust gases, which the engine now needs to expel through the exhaust system to start the entire combustion cycle again.Īs a rule of thumb, the faster a vehicle’s exhaust system can expel the gases, the better its engine will perform, which is especially true for high-performance engines – more on this in the Backpressure section below. Completing all four cycles counts as one full combustion cycle for that particular cylinder.īy combining predetermined amounts of air, fuel, and spark, engines can produce the explosions needed to create the energy that pushes an engine’s pistons up and down the cylinder, sending power to the crankshaft, then to the drivetrain, and finally to the wheels. Most modern combustion engines are four-stroke engines that rely on four distinct strokes to produce power – Intake Stroke, Compression Stroke, Power Stroke, and, finally, the Exhaust Stroke. Without going too in-depth into how the ICE or Internal Combustion Engine works, a car’s exhaust system is responsible for dealing with the engine’s exhaust stroke – the final stage in a combustion engine’s four-stroke cycle where the burnt fuel gets expelled through the exhaust system. If you want to upgrade your exhaust system, you will want to know what these differences are so you can decide which best suits your preferences in terms of power, setup, and sound.īefore we delve into the confusing world of headers and manifolds, we first have to learn how the exhaust system works and what it does for your car. Nevertheless, as you read through this article, you will learn a few key differences that separate an exhaust header from an exhaust manifold and why tuners prefer one over the other for their engine builds. ![]() In addition, unless you have a front-wheel-drive Honda that shows its headers front and center in the engine bay like prized trophies, these vital exhaust components are generally hidden from plain sight. The same dilemma exists in the exhaust headers vs manifold confusion – these two exhaust components look so much alike that most casual car fans will not be able to tell which is which at first glance. After all, both fruits look so much alike that only real fruit aficionados can tell the differences between the two. If you are one of those who cannot differentiate oranges from tangerines, there is no need to be ashamed. Differences Between Exhaust Headers and Exhaust Manifold.Welcome to our Exhaust Headers vs Manifold guide. Both ensure your engine can expel nasty fumes quickly, but a few key differences make one better than the other. ![]()
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