Exhaust header design theory. ) or other in-line four .

Exhaust header design theory. Calculate an optimum tube size. Aug 14, 2015 · In order to better understand the function of the exhaust system, it helps to first understand how the air and fuel charge enters the engine and how it is influenced by the chain of events that include intake air, carburetor or throttle body, intake manifold, fuel metering, cylinder heads, cam-shaft, exhaust manifold or tubular headers, and the Dec 15, 2023 · The theory is that the huge amount of exhaust gas flow into a relatively-confined space raised the collector pressure enough to create a destructive blockage in the collector pipe. Nov 12, 2013 · Popular Hot Rodding tells you how to pick the right header for your specific car needs based off of tube diameter, length, and flow. Graham Bell's Performance Tuning in Theory and Practice or Philip A Smith's Scientific Design of Exhaust and Intake Systems. Since the engine pistons in 4-cycle engines must act against this pressure when evacuating the cylinders, the level of pressure in the exhaust manifold causes a parasitic loss in engine power. These restrictions tend to build more backpressure and hamper the velocity and flow of exiting exhaust gases from the combustion chamber. 2T Exhaust Calc - Ver 1. As we've mentioned in our introduction to building exhaust systems, the exhaust manifold design, exhaust header design has a major affect on engine performance, and plays an important role in car tuning. We are all Nov 27, 2015 · In the first part of our Header Theory posts, we dug into the whys and how of header primary tube length. BUT, I'd like to make sure that I have things straight. I just went through the header articles on this site and my memory was refreshed a great deal. The exhaust pulses are far apart and do not compete for flow area in the collector allowing for a relatively small collector outlet and resultant increased power band. Has anyone here attempted to install a "zero loss" system of his design on our sixes. For example, if you’re running a tube into a steering column, you’re going to see it. As hot exhaust pulses travel through a pipe they create pressure waves that can effect the way hot gas escapes and returns back into the cylinder. 0 / 6th April 2019 2T Exhaust Calc is a Freeware program created to design a 2 Stroke engine performance exhaust system generally referred to as an "Expansion Chamber" The software equations used are derived from the work of Professor Gordon P Blair who carried out the most comprehensive scientic study of 2 stroke engines ever undertaken and published by SAE (Society 6 days ago · These formulas are from A. Now Im having a great time coming up with ideas for high mpg header designs. The automotive term for this is "scavenging. 8 times the ideal header diameter. We would like to show you a description here but the site won’t allow us. i'm thinking my header guy is backwards. Apr 1, 2008 · The commonly accepted theory is that the 4-into-1 header offers more top end power, while the tri-Y header is designed to bolster midrange torque. By replacing the stock exhaust manifold with aftermarket headers, you can enhance your vehicle’s power and efficiency. May 10, 2020 · Header design IS rocket science. The exhaust port shape can vary dramatically with so many OEM and aftermarket cylinder heads available for these engines. Here are five tips from Burns Stainless and REF Unlimited. If the belly is too wide then that causes the end of the diffuser and the beginning of the baffle to be "dead zones" that cause very minimal return wave strength and so in essence lengthens the belly. This Bonneville big block header uses smooth transitions that are required for thin wall exhausts (0. This thread is a supplemental source of information for The Exhaust, Downpipe, and Manifold Thread. Graham Bell s Performance Tuning in Theory and Practice or Philip A Smith's Scientific Design of Exhaust and Intake Systems. Depending on the vehicle type and engine concept, the individual components can be combined in different ways. Abstract - This paper takes a look at the design, optimizing and manufacturing of an Intake and Exhaust system for a formula student race car. Overview Explains how to design and construct exhaust systems matched to the engine to optimize power. Mar 11, 2014 · How much of high performance muffler design is based on science and how much is slick advertising? How do you pick the best performance muffler for your application? We tackle these questions in this tech article. Due to the com plexity of the problem, compromises as well as fine tuning during engine testing will be inevi table. shouldn't the primary be larger? or is that theory opposite on tri-y headers? May 21, 2010 · I'v been looking into the various types of exhaust headers that are available and was wondering if anyone categorically knows what is the best shape, primary length and diameter? My application is for a race L28 with triple 45's. See full list on musclecardiy. Calculate Exhaust Header LengthCalculate Exhaust Header Length Maximum Horsepower Output Tuning the exhaust system can be an important component in achieving maximum power when optimizing the performance of an engine for racing or dyno shootouts. Sep 20, 2008 · keep firmly in mind that the header exhaust scavenging ,efficiency and intake runners ability to effectively fill the engines cylinders is very much dependent on carefully matched, cam timing, headers designed to match the engines displacement, intended rpm band, ,maximum compression ratio, for the fuel octane used,and a low restriction exhaust behind the header collectors, when all the Jun 22, 2017 · The theory behind tuned, equal-length headers and how they improve scavenging: It’s all above shock waves and exhaust-gas pulses. On a related note Dec 4, 2018 · Looking for headers for my car and I see the Sanderson shorty version which just seems to make so much sense. or. Individual pipes that are dedicated to a cylinder are referred to as primary pipes. The exhaust pressure is able to travel through the internal pipe, with sound pulses dampened or filtered by the packing material. You'll receive a copy of the entire interview in MP3 Audio format Nov 30, 2021 · 4-2-1 or 4-1 headers; can’t decide which to install? We compare them and show you the differences to help you to choose the right headers for your engine. With this exhaust setup, the exhaust pulses into each 3-1 collector for all these combinations are separated by 240 crank degrees. Million-mile exhaust warranty. The design engineer now has to carefully adjust intake manifold geometry so that these require ments, which partly even contradict each other, can be fulfilled as best possible. Not the turbo hanging off the exhaust manifold. Headers help evacuate exhaust gases from a cylinder through negative pressure. Jun 29, 2020 · We explain the differences, and pros & cons of both Tri-Y and 4-into-1 designs to help you pick the best exhaust headers for your ride. 25x the area of the exhaust port, so the angle is determined the by the breadth of power band you are looking for. Dec 19, 2017 · 180-degree Headers help V8 exhaust, improving low- and midrange torque by crossing over two tubes from each bank to the opposite bank’s collector. Jun 23, 2018 · Exhaust System Design & Tuning – VIDEO TECH Richard Waitas, Senior Manager at Magnaflow goes through the entire process of exhaust system design, the theories, the considerations, the measurments & calculations. The temperature of exhaust gas is controlled by air/fuel mixture, spark, and cam timing. The design selection is the first step. These smaller vacuum waves help evacuate exhaust An article on Engine exhaust flow. The theory is akin to early-generation silencers used on some firearms. The Intake and exhaust system of the vehicle has to strictly comply with the rules of the Formula Bharat Competition. May 2, 2016 · Step headers may employ many different sizes of tubing — as many as four or five between the primary and the collector. Generally, people tend to copy what others have done, often choosing too-large tube and pipe diameters with the belief that bigger is always better. These processes take years to master. The layout of a 4-2-1 system is as follows: four pipes (primary) come off the cylinder head, and merge into two pipes (secondary), which in turn finally link up to form one collector pipe. Factory exhaust manifolds tend to have fairly restrictive designs. Performance cat-back exhaust systems, rear sections, mufflers, headers, induction, & more. The following excerpts are from Jay Kavanaugh, a turbosystems engineer at Garret, responding to a thread on regarding exhaust design and exhaust theory: The small throat area of the turbine casing presents a restriction to the exhaust gas flow from the cylinders and results in a high pressure in the exhaust manifold ahead of the turbine casing. The header primary length is calculated from the backside of the exhaust valve. Smith’. From what I gather, the size of the resonator necessary for our engines would be Calculates tube length based on desired diameter Works with header calculation 2 if desired Enter your engine's displacement, number of cylinders, desired tuned engine speed, and exhaust header tube diameter. Not so. Apr 23, 1996 · You know that changing the exhaust pipes on your two-stroke motorcycle can have a marked effect on the engine's power characteristics, but do you know why? Oct 26, 2002 · I'm going to make a Tri-Y collector for my header to improve on my first poor attempt, which was a 4-1. While not recommended for street, the use of drag or straight pipes can maximize the horsepower produced by any specific engine combination. You can also use a CFD program to see how it will handle the exhaust pulses and interact with other cylinders. Oct 1, 2021 · It’s a faithful, one-to-one scale model. May 2, 2016 · A performance exhaust system is a characterizing element for any internal combustion conveyance. Determining exhaust header tube size and length. Oct 30, 2015 · Inside a header (with the engine running), “waves” of exhaust passing through the tubing are more or less manipulated to extract the burned gases from the combustion chamber. While that sounds simple, a lot goes into the design of a set of headers. Calculate Primary Header Tube Length and Diameter Wallace Racing BACK to Calculators These formulas are from A. By desigining and testing the headers in the virtual world, a lot of time and effort is saved building the actual headers. While stepped headers may offer improved power and power band, some applications are nonetheless better suited to a straight design. Learn how to design car exhaust systems that deliver power and an iconic sound, with an eye-catching look. Oct 11, 2016 · How exactly does header design and sizing affect the powerband of the Coyote? We put the 5. The book includes theory and practical design of the entire exhaust system (headers, resonators, catalytic converters, mufflers) and teaches how to fabricate or select and purchase the individual components to match the design. The purpose of this post is to discuss the theory and design behind turbocharged application exhaust systems as to better understand both the options available and the optimum configuration for a Aug 29, 2000 · Before we delve into the dark art of exhaust theory, let's take a quick journey through the exhaust system from the perspective of the exhaust gases. Aug 26, 2020 · Introduction Exhaust headers serve to optimize the pulsatile flow of exhaust gases from the internal combustion engine by means of resonance tuning to increase the air mass flow rate and thus the power of the engine. turbo exhaust theory links. You can learn how to use a CAD program somewhat quickly but you really have to master a fluids program to be able to Mar 13, 2014 · Fixing unwanted pressure waves from exhaust tubing is still a difficult task even today. One is basically to have the smoothest possible transition between the two components with the ports perfectly Aug 25, 2020 · This is an older thread, you may not receive a response, and could be reviving an old thread. Feb 14, 2021 · If I understand the theory of cross-over header design, the even firing exhaust note is possible on a V8 with the proper header design. 4 m/s) which gives a reasonable balance between backpressure and scavenging. Sep 13, 2023 · Understanding Exhaust Headers Exhaust headers play a crucial role in a vehicle’s exhaust system. A good starting point for exhaust gas temperature is 1200 F for a midrange NA performance build. In fact, it's fairly common on GT40s with the "bundle of snakes" header design. Typically, the easiest and quickest way to ensure a good design choice is to use an existing, proven design as a basis for your new header. I have been looking at the Arrow Street Triple titanium lowboy exhaust to mount on my Daytona. Exhaust header design using individual primary pipes for each cylinder has been fairly well examined elsewhere. The Initial question 1 is Are header primary tuning lengths/steps generally avoided in turbo header design because their effects are so diminished with a turbo on the end of the system? Can pipemax for a n/a motor sizing be used for the turbo header? Continuing on with the topic of turbine energy. Regardless, I'd like to ask what all of you believe the impact of exhaust header diameter to be on engine performance. Before you buy your next set of headers, collectors, and/or mufflers, you'll need to Oct 31, 2013 · Anti-reversion headers incorporate primary tubes with a stepped design, which increase in diameter shortly after exiting the cylinder head, and a direction-sensitive cone that keeps exhaust flow Vincent Roman of Burns Stainless. Please consider creating a new thread. It helps to suck the exhaust gases out of the engine. The weight savings would be huge, and the idea of a lower outlet appeals to me So for peak exhaust header pressures of 10 to 16 psi that equates to 2. 5 to 2. ” The blocks are available in three types: EH for exhaust headers; NP for turbocharger manifolds; and FE for full exhaust/cat back systems, intercooler and turbo downpipe tubing assemblies, and cold air intakes. Taking advantage of the pressure phenomenon allows the engine to breathe better by assisting in the removing of toxic gases from the combustion chamber. For a race engine, the peak hp RPM should be Because of the lack of consistency of my "restriction" based Header Design theories I began to realize there had to be a better way (a theory) of looking at exhaust system design - one that would not only work CONSISTENTLY when applied but also one that would deal with the "goofy" things I was seeing as well . The exhaust system specifically designed for the engine Feb 9, 2022 · The right set of headers is a huge part of ensuring your engine is as efficient as possible. For instance, did you know that cast-iron manifolds can deliver almost as much power-making air flow as headers? Mar 21, 2014 · I own a crf450r, powerbomb header. This design results in a header that is more efficient at scavenging the exhaust from the cylinders. Now what exactly do the megabomb and powerbomb headers do? From what I understand, they quiet the exhaust while producing more power compared to a header of continous diameter but how?. But, before you begin Apr 1, 2009 · If this were NOT true, increasing exhaust duration by raising the top of the exhaust port would not result in additional high-rpm power. If you recall, Hooker Headers and Reher-Morrison Racing Engines gave … Aug 16, 2015 · An exhaust manifold allows individual cylinder exhaust gases to exit the cylinder head, immediately into a single collective path, or chamber. By harnessing the power of sound waves, they create a symphony of power which enhances the process of exhaust scavenging, thereby realizing the full potential of the engine. According to the rule, to limit the power capability from the engine, a single circular restrictor of 20mm must be placed in the intake Jun 13, 2025 · Learn the essential components and functions of automotive exhaust systems in this comprehensive guide to engineering design principles. Each time a power stroke happens in the engine and an exhaust valve opens, positive pressure is created in the exhaust manifold. Dec 15, 2011 · Computer modeling has helped push header design beyond the 1980s. Simultaneously, those waves of exhaust help the intake side by pulling in a fresh air-fuel charge. Probably for this reason, every modern pipe design I've seen incorporates head pipes that start diverging practically from the exhaust manifold, providing additional scavenging at high rpm. Various exhaust designs have evolved over the years from theory, but the majority are still being built from ‘cut & try’ experimenting. Feb 20, 2009 · Header - Although not part of the tuned pipe, the header plays an important role in the overall tuning of your engine. 0 on the dyno with a few different sets to find out. Mar 1, 2023 · Most stepped headers feature sharp steps. The first steps in an exhaust header project, as in all projects, is to establish your baseline and your objectives. g. The RPM Feb 13, 2012 · Magazine Builder Spotlight Headlong For Headers How to design, build and test an ultimate exhaust system for the IO-540 Lycoming engine. From reducing backpressure to enhancing the scavenging effect, exhaust headers are a vital component in unlocking your engine’s full potential. I had a 350 CID V8 running at 6K RPM in a qtr-mile '68 Camaro. 1. Oct 13, 2007 · I have been working on cars for years and have always enjoyed improving the performance of cars by adding a set of headers. First off, this is my daily driver, & I'm looking for maximum total torque & hp. Jan 21, 2021 · The vacuum caused by exhaust flowing out of the exhaust port and into the header is what pulls the air into the cylinder and out of the exhaust port, further pushing the exhaust gases, priming the motor for the next cycle. Design the header length for about 1000rpm shy of the rev limiter, figure out your gear change rpm figure out the tuned length for 500+ rpm lower than your gear change rpm, that's the length of your megaphone, now you want the megaphones large end to be 6. If all Aug 14, 2009 · TRI Y HEADERS by HIGHOCTAIN2000 » Fri Aug 14, 2009 5:10 pm What is the advantage of 4 into 2 into 1 style headers. By understanding the science behind their design and function, you can make informed decisions about upgrading your vehicle for better performance. They are designed to improve engine performance by optimizing the flow of exhaust gases out of the engine. So buckle up and get ready to experience the exhilarating sound of a finely-tuned exhaust system. i under stand the theory behind 180 headers, but when i look at tri y headers the cylinder parings compared to the firing order just doesent make sense. Unlike older types of exhaust manifolds, headers are lightweight and better in their design for airflow inside; hence, they promise increased power and torque. In terms of exhaust header design, both the primary pipe diameter and primary pipe length will determine the engine's overall power band as well as its peak power point. Dec 3, 2016 · After really thinking about the OEM header I decided that I really dislike the design and wanted a better designed aftermarket header. With racers spending large sums of money on modified induction systems, it is only logical that an equal amount of attention be given to the exhaust “exit” side of the equation. Turbo Exhaust Theory I stumbled across this information on a forum. And in between these positive If this were NOT true, increasing exhaust duration by raising the top of the exhaust port would not result in additional high-rpm power. At this point a mock-up is unnecess Mar 28, 2020 · Lengths (induction or exhaust ) are measured from “the valve head” and through the theoretical centreline of the run (tube or pipe) With the exhaust this is known as the “down pipe” to the collector. " Effective scavenging of exhaust gas increases an engine's overall efficiency. The theory of this design is to generate a progressive exhaust velocity to optimize scavenging nearest the cylinder while preventing restriction at the outlet. Using this approach for intake manifold design we were able to simulate various design concepts in an effective and fast manner. Jun 28, 2017 · If headers are not in the budget, exceptionally-reworked exhaust manifolds can flow “almost” as well as headers. Sep 4, 2018 · Few elements have as large an impact on a motorcycle’s design as the exhaust system. , intake or exhaust), manifolds serve as hollow bodies through which a fluid, such as air or water, passes to transition from one space to another. Jun 10, 2019 · This is specifically regarding the exhaust manifold (header) to cylinder head interface. Post Reply Home Forums Knowledge Base Engine Exhaust Exhaust Articles May 1, 2007 · For more detail on the specifics of header theory read ‘The Scientific Design of Exhaust and Intake Systems' by Phillip H. Two popular types of exhaust headers are the 4-1 and 4-2-1 headers Nov 29, 2023 · With advancements in exhaust system design and the continuous evolution of sound engineering, the future holds endless possibilities for creating the ultimate symphony of power. Aug 14, 2015 · Exhaust enters the perforated tube and bleeds out through the perforations into the packing material, which serves to absorb sound. has anyone heard of tri-y headers with the primary tube being bigger than the secondary tube? such as 2 3/8 stepped down to a 2 1/4 secondary. Also, unlike the 180 degree configuration necessary on the 90 degree V-8s, the header packaging May 29, 2025 · Designing car exhaust systems: Maximize performance and style. However, this is generally specific to engines with an individual exhaust port for each cylinder, and cannot be directly applied to many older engines with common or “siamese” center exhaust ports such as the BMC A Series (Mini, &c. On a related note Jun 3, 2024 · Researchers debut novel manifold design theoryOften categorized according to their purpose (e. The main objective of designing exhaust headers are to enhance engine breathing by minimizing backpressure at high rpm and exhaust pulse tuning to maximize wave scavenging potential during Jan 25, 2008 · Exhaust Tuning Theory and System Design We've all heard the magazines talk about 'back pressure' (and most of what they say is utter cac) so how do we ensure we have a good, efficient, exhaust system (bearing in mind that 'back pressure, any back pressure, is a bad thing)? Well, some history: Bac Feb 19, 2023 · The exhaust velocity number is very combination and exhaust design dependent, to finely tune this number you need to do testing. Added collector extensions, painted a Thread Rating:1 2 3 4 5 Design of an exhaust system Essentially, an exhaust system consists of exhaust manifold, Y pipe, catalytic converter, particulate filter, pre-muffler, middle muffler, rear muffler and the corresponding connecting pipes. Choosing diameters that are too large can rob the engine of torque and horsepower at lower […] Feb 3, 2004 · I was just wondering how this header's design helps increase the hp and torque over the whole rpm band, this is quite a crazy looking header, and I can only assume the bends and curves somehow help increase the exhaust flow velocity and negate any type of reversion or backpressure, compared to Mar 26, 2021 · The complexity of cylinder head set up and flow bench testing comes in the form of math, aerodynamics, thermodynamics, and the physics it takes to design the correct port and manifold design for a particular engine combination. 035-inch wall or less). Feb 6, 2006 · "Advanced" Exhaust header theory in practice by Monkeywrench » Mon Feb 06, 2006 1:17 am Reading the current thread on headers. Cut-and-try, referred to cutting the exhaust system to different lengths, if you are trying to achieve wave-tuning results. HyTech has been building exhaust headers and systems for more than 30 years, working with the likes of Honda Performance Development and Kia’s Pirelli World Challenge racing team. As the exhaust valve opens following the power stroke, a pressure wave and a mass of exhaust gas flows from the cylinder into the header primary. How They Work Headers can provide more than just sending the exhaust to the back. How to improve it to make max horsepower and torque out of your motor through piping sizing and muffler design and material An easy way to effect a small increase in exhaust efficiency, if space permits, is to move the header out away from the port by 1/2” or more (using an extra gasket and longer studs or bolts). From header to exit, the gently curving shapes help define some of our favorite bikes, but the shapes are far Jun 27, 2020 · Have you ever wondered if shorty headers are a good option? We talk to industry professionals to find out why you need to consider installing them. Oct 30, 2017 · We've previously discussed header design; what about post-collector extensions? Most commonly seen on motorcycles and other small motors that are inherently peaky, a megaphone-shaped collector A 4-2-1 exhaust system is a type of exhaust manifold for an engine with four cylinders per bank, such as an inline-four engine or a V8 engine. When constructing racing headers, it is very important to make a logical plan before cutting any tubing. In a naturally aspirated engine, one without forced induction from a turbocharger or Jul 9, 2008 · ive been preaching that on here for a while, lol a good header will pull a vacuum on exhaust gases from the combustion chamber, if you have too small of a tailpipe setup all of your power will be low range, but how often do you need power on the lower rpm? 3" for me gives me a good jerking powerband from about 3000 to 6300 rpm as far as i rev. I haven't really seen anything much in the way discussed in "advanced" exhaust theories, besides a little info here and there, such as expansion chambers, stepped headers, merge collectors, etc. Nov 2, 2007 · I have been looking for exhaust answers myself, though not necessarily related to maximum HP numbers. As far as the pipes themselves are concerned, it is well known that "too sharp a bend" in the primary or "too much length" dramatically reduces engine performance. Only lately have computer programs like the Burns X-design or high end engine simulation programs been able to help in this process. Sep 26, 2006 · Page forward to the current street rod exhaust header and you find that most header manufacturers design their street rod headers to give you maximum performance in a street-driven automobile Oct 25, 2018 · This paper focuses on ways in which the capabilities of an exhaust system are exploited in improving engine performance of an FSAE vehicle. How do you get maximum performance out of your exhaust header? For starters, an effective These formulas are from A. 5" tubing from the header, back, so the final Y This illustrates not only the effectiveness, or otherwise, of this type of exhaust tuning on four-stroke engines but also the effectiveness of an accurate engine simulation as a design and development tool. In The Secrets of Header & Exhaust Design, you'll get a unique opportunity to listen to an interview with John Grudynski of Hytech exhaust as he shares his wisdom from decades of building race winning custom headers and exhaust systems for street cars and a whole host of winning teams from SCCA, Dirt Track, Grand Am, and more. Calculate tube length, area, and volume based on both the calculated and your specified tube diameter. Qualitatively, this is 95% of the game. Defining the acoustic profile and influencing the powerband — exhaust design is a more dynamic science than stringing together a few pipes and tacking on some mufflers. This article provides a simplified, yet detailed explanation of what is important in proper header sizing. You'll receive a copy of the entire interview in MP3 Audio format CAD software for turbo header exhaust design?. NEW header design combines 5 conventional pipe designs to substantially increase vacuum and produce a supercharging effect Negative Pressure Supercharging Tri-Y header works differently to other headers and does NOT work alone During header design, engineers create a manifold without regard to weight or cost but for optimal flow of the exhaust gases. When designing an exhaust system, turbocharged engines follow the same rules as naturally aspirated engines. What are the actual physics behind them? Maybe they provide a little more ba Jan 1, 2023 · This cutaway AR header section reveals some of the tricks of the tubing trade—like the specific angles and the special shapes incorporated into the new design. I've seen two theories about the flow of exhaust gas from the head to the exhaust system. Basically, you need to answer the question, “Why do I want to build a new header?” Dec 14, 2017 · He gets into a lot theory about what does and does not work when it comes to an exhaust. Any recommendations for off the shelf headers? Some examples are be Aug 1, 2008 · Here's what Lemons has to say regarding header design, exhaust theory, installation tips, and how custom headers are built. A header provides a dedicated tube for each cylinder head exhaust port, while a manifold collects and routes all exhaust ports to a single outlet, which is in close proximity to the cylinder head. Aug 17, 2015 · Exhaust headers differ from exhaust manifolds. I chose 1-7/8 inch diameter equal length tube, 29 inches, and raced it. That doesn't really apply to regular street Bullets. These are basically distinguishable with changes in density of the exhaust gas, and any formula or header design must take both dynamics into consideration. An exhaust manifold is not the most efficient design, but it is the most simple, most direct, and least expensive method of routing the engine’s exhaust pulses out of the engine. As the piston approaches top dead center, the spark plug fires igniting a fireball just as the piston rocks over into the power stroke. A good starting point is 300 ft/s (91. While not recommended for street bikes, the use of drag or straight pipes can maximize the horsepower produced by any specific engine combination Nov 14, 2006 · A typical set of race headers might have two inch primaries and a three and a half inch collector, something like that. Jan 2, 2025 · An exhaust header is an integral part that increases performance and efficiently collects and directs all the exhaust gases from an engine's cylinders. I've got 2. ), B Series (MG, &c. Although this isn’t entirely a false assumption, a header produces the most power due to Jan 10, 2018 · By creating multiple rarefactions, a header design with multidiameter “stepped” primary tubes can broaden an engine’s torque and power curves. Related Articles The Ultimate Guide to Performance Car Exhaust Systems Apr 22, 2025 · This explanation examines how modern exhaust headers create substantial performance improvements for automobile systems and operational gains. Headers: Made from lighter materials with a design focused on performance, they offer better airflow and reduced back pressure. Our competition road race headers are built exclusively for us under a proprietary arrangement with one Jan 19, 2011 · Among theories advanced to explain the phenomenon, there appear to be two prevailing concepts that deal with the "tuning" of intake and exhaust systems. For example, a car’s intake manifold facilitates the flow of ambient air into the engine’s cylinders. On a pressure trace of exhaust port pressure, you will see a quite broad and very definite negative reflection where both return waves merge, tending towards a double hump if the collector is made quite long. Creating broader Power Bands: The stepped design also creates multiple wave reflection points. Roman started with definitions of critical factors involving exhaust, especially incompressible flow and compressible flow. One can lose power by not selecting the correct size. I've been trying to get as much info abou ABSTRACT: This paper emphasizes on designing and optimization of exhaust headers for FSAE car engines and it uses the art of wave dynamics to maximize wave scavenging potential during valve overlap period. Jun 1, 2004 · Read about the basics of engine exhaust systems along with the summary of exhaust theory in this issue of Sport Truck Magazine. ?There are CAD and 3d modeling programs that can help you do layout and visualize things. The shape, size, and the radius bends of the exhaust manifold determines the frequency of the waves. For those that prefer quicker results, Burns Stainless makes designing a racing exhaust header easy. It was a general megaphone theory response. One such exhaust manifold configuration is the 4-2-1, which means four pipes to two pipes to one pipe. ) or other in-line four The most critical design parameters for an exhaust header is the primary length, primary diameter, collector size and tail pipe size. The resonance characteristics of the quarter wave primary tubes is of highest importance. Harley- Davidson Performance Guide Calculate Exhaust Header Length Maximum Horsepower Output Tuning the exhaust system can be an important component in achieving maximum power when optimizing the performance of an engine for racing or dyno shootouts. Mar 22, 2020 · Maximizing exhaust flow is a key element in obtaining peak performance from any high-performance engine. Low Budget and Basic Iron If the cost of a set of headers is outside your budget, you’ll have to make the best of a set of iron exhaust manifolds. One involves the study and application of Dec 8, 2010 · I have been reading a lot of the David Vizard exhaust theory, and after reading it about ten times, it makes some sense to me. Header Wizard Calculator pinpoints the ideal header dimensions for your engine in a snap and simplifies header design saving hours if not days at arriving at a top performance-tuned exhaust header. I would imagine there's more clearance, easier installation and you could tuck the exhaust up high . Aug 16, 2015 · Choosing exhaust pipe diameter and header primary-tube diameter and length can be confusing. I found the theory, did some figuring, and bought 1-5/8 inch diameter by 28 inch length and reduced ET by three-tenths of a second. If your exhaust port is 2" and calculator result is 36", you will need 34" long primary tubes. To explain how stepped design improves flow and power range, let’s review what happens in the header. The exhaust system of a car is one of the most commonly modified areas when a gearhead gets ahold of their ride. On […] Sep 15, 2003 · The exhaust port design is critical in determining the size differential and placement of steps in a step header, and since we create our headers individually on a case-by-case basis, we can Aug 15, 2014 · To extract maximum performance, an engine needs an efficient, well-designed, and properly tuned exhaust system. 18th BIRTHDAY Great Specials on All Software!! Jul 1, 2015 · To find out as much as we could about the dynamics of getting exhaust out of an engine, we spoke with John Grudynski, CEO of HyTech Exhaust in Irvine, Calif. Engine builders and car owners need to carefully consider the exhaust layout, select the parts, and fabricate the exhaust system that delivers the best Stepped header diameters are a high-tech method of tuning the exhaust system of a performance engine. Some reasons to upgrade to headers include improved sound, fuel efficiency, and Note that both the stock manifold and the tri-Y header produced horsepower and torque peaks at equal engine speeds, 7,700 rpm and 7,200 rpm respectively. In fact, the exhaust system's design, components, and materials have a large impact on the overall performance of the engine. Premier performance exhaust manufacturer for cars, trucks, SUVs, and dedicated race vehicles. Longer cones broader The idea behind any exhaust system is to remove as much exhaust gas as possible from the cylinders quickly. The header attaches to the engine and is the straight or slightly divergent (opens up 2-3 degrees) section of the pipe. Jun 23, 2015 · Building a killer set of race headers doesn't have to be as challenging as it might appear. You may or may not need to re-time your ignition with a change in exhaust design. As with just about any major purchase I start with reading then building a spreadsheet to compare one part vs the other. For a street engine, the RPM used should be the peak torque RPM. About the only difference is that the turbo engine will require quite a bit less silencing. Though camshaft timing and intake design play a major part in shaping the overall power curve, identical peak power engine speeds demonstrate, at the very least, consistency in exhaust design. So what's the negatives with using a shorty style header vs a full length ? Competition engines move so much air at high RPM that proper application of header design theory is crucial. The group’s theory presents a completely The inputs are in Metric Units but output also includes inches. com Understanding the exhaust port shape on small block Chevy cylinder heads is important, specifically regarding header selection. A general assumption is that a header produces more power merely by reducing backpressure. Exhaust Manifolds Vs Exhaust Headers Exhaust Manifolds: Typically made from cast iron, they are designed for durability and cost-effectiveness but can be restrictive in terms of airflow. . fwuljr ygtpu fxthyn yaksl rykd wbqcjg ttqoun niag nkxyyz fhhfq