Design and analysis of intake and exhaust system of sae. Mechanical exhaust ventilation systems design, calculations, and operational guidelines 2019 page 5 of 30 p. Pdf a practical approach towards muffler design, development. Reactive type muffler system design methodology the properly. Minimizing resistance to gas flow back pressure and keeping it within the limits specified for the particular engine model and rating to. Furthermore, the exhaust systems take away the exhaust gases. Oct 30, 2015 header design can have an effect upon both. You must take into account your engine displacement, head size, cam timing, intake design, carb size, and other aspects of the engine package. Engine exhaust considerations the exhaust system of a generator has several inherent design problems that must be considered. The attenuation characteristics of a muffler are modified if the design tailpipe is not used. Page objectoftheinvestigation 1 theory 3 calculationofmuffleralonglines followedinpreceedingtheory 11 thetests 15 descriptionofapparatus 16 descriptionofliufilerstested 19. Bellows are typically used for exhaust systems with a diameter of 200 mm 8 in and larger.
In fact, the exhaust systems design, components, and materials have a large impact on the overall performance of the engine. Ul standard 710 establishes minimum exhaust values, again which are arbitrary and has nothing to do with performance, only safety. Page objectoftheinvestigation 1 theory 3 calculationofmuffleralonglines followedinpreceedingtheory 11 thetests 15 descriptionofapparatus 16 descriptionofliufilerstested 19 datasheet 20 calculationofresults 21 resultsandconclusions 22 curves 25 figures 30. Engineering 26 university of kentucky source engine pump compressor intake or exhaust area change expansion chamber helmholtz resonator quarterwave resonator termination we would like to predict the sound pressure level at the termination. Design, design exhaust systems, car exhaust systems. A performance exhaust system is a characterizing element for any internal combustion conveyance. Exhaust optimization for viking motorsports formula sae team. The study is carried out on ashok leyland passenger busses. The pipe diameter, component length, catalytic converter size, muffler size, and exhaust manifold design are engineered to provide proper exhaust flow, silencing, and emission levels on a particular engine. Sound is a pressure wave formed from pulses of alternating high and low pressure air. Wolff8 concluded that the mechanical stresses induced by the vibration of the exhaust system do not yield a major effect on the fatigue life of the exhaust manifold. If the design is correct, when the highpressure part of the sound wave passes through the collector, it. A practical approach towards muffler design, development and prototype validation.
Exhaust tuning theory and system design weve 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. Also, the effect of exhaust gas flow speed has a detrimental effect on the muffler performance. Chapter topics range from simple flow problems and sound and its energy to designing a system for racing. Powroll has some good data on exhaust system for these two valve engines and pete told me that the xrsonly stepped header was close to their. With the current system failing to meet fsae regulations and lacking in rigorous engineering design, the team is tasked with researching, designing, and manufacturing header and muffler components with. Designing exhaust manifolds using integral engineering. Therefore muffler design becomes more and more important for noise reduction. Both practical experience and acoustic theory suggest that the.
If the design is correct, when the highpressure part of the sound wave passes through the collector, it is creating a lowpressure condition. Design of mufflers is a complex function that affects noise characteristics, emission and fuel efficiency of engine. In an automotive engine, pressure waves are generated when the exhaust valve repeatedly opens and lets highpressure gas into the exhaust system. The answer and links given by bob cross offers a good and real insight into the considerations for building an exhaust system. Whilst magnaflow and cherry bomb deliver exhaust boxes to go after enhancing the sound of an exhaust i have never been able to find a tutorial to fully embrace the subject. We shall send you a pdf document with the templates for manufacturing your exhaust. Mastering exhaust system math to build highperformance. Aug 14, 2015 the components involved in the engines air and fuel intake, combustion, and exhaust process are revealed in this chapter. Exhaust optimization for viking motorsports formula sae. Understanding muffler design and sound absorption strategies. The silencer makes a major contribution to exhaust noise reduction.
Following the n62 engine was the new v12, the n73 in the new 760ili. Jan 24, 2015 mastering exhaust system math to build highperformance engines january 24, 2015 by muscle car diy exhaust systems dont generally invoke the glamour and gut level appeal associated with many highperformance induction systems, but they certainly play a critical role in the performance of every engine. For a single exhaust system, exhaust pipe diameter should be around 3. Improve the performance of your twostroke engine with a torqsoft designed exhaust system. Exhaust system design is more complicated than running a few tubes. The above is a diagram of the major components of an exhaust system in a car. Based on the experience and theory of acoustics for muffler design for various.
In this months enginology section circle track contributor jim mcfarland reduces intake and exhaust system tuning theory to practice circle track magazine. General design principles for an automotive muffler australian. Muffler volume calculation based on the available data and theory of. The unfiltered exhaust flows thru the dpfs channels that are open at the inlet end. The components involved in the engines air and fuel intake, combustion, and exhaust process are revealed in this chapter. Theory and practice in exhaust system design 850989 as in many fields today, a significant gap has developed between theory and practice in exhaust system design. The exhaust gases then enter into the channels that are open at the outlet end. Diesel engine system design desd is an important and leading function in the design and development of modern lowemissions egr diesel engines. Techtips performance exhaust basic principles and design. Here, exhaust gases move past the valve and exit through the exhaust port into the header primary tube and eventually working their way into the atmosphere. Inertial scavenging of gases begins as soon as the exhaust valve opens.
The exhaust note is in the design, not the material. In a helmholtz resonator design a cavity is attached to the exhaust pipe. Muffler design, development and validation methods ijirset. These characteristics impose severe limitations on what can be done to silence the engine exhaust noise.
The intent of the competition is to provide universities with an. Pdf mufflers are important part of engine system and commonly. Exhaust systems engine an overview sciencedirect topics. The diesel particulate filter core contains porous walls of a ceramic honeycomb structure made of silicon carbide. The study depicts the common causes of silencer failures. Jan 25, 2008 exhaust tuning theory and system design weve 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. Performance exhaust system design and theory enginelabs. Reactive mufflers are used widely in car exhaust systems. A flexible exhaust connection has three primary functions. If you thought that a bigger exhaust system meant bigger power, youd be mistaken. For a dualexhaust system, pipe diameter should be in the 2. Each of the mufflers has two outlets, with one side having a butterfly type valve which allows the exhaust flow to be shut off, regulating which. Exhaust scavenging makes an exhaust system more efficient because as your exhaust gases pulse out of the engine from each exhaust stroke of the engine, you have a high pressure area leading the exhaust pulse, followed by a low pressure area with a transition.
Diesel engine fundamentals doehdbk1018193 objectives enabling objectives cont. The theoretician often does not appreciate the relevant practical concerns associated with the design process, while the designer often has difficulty in properly interpreting theoretical results for practical use. The tailpipe itself acts as a resonant cavity that couples with the muffler cavity. Designing exhaust manifolds using integral engineering solutions abstract exhaust manifold cracks from thermomechanical fatigue tmf are often seen on highly loaded engines, due to increasing marketplace demands for performance and emissions. Piston engine intake and exhaust system design semantic scholar. The design of an exhaust manifold for the internal combustion engine depends on many parameters such as exhaust gas back pressure, velocity of exhaust gases etc. Exhaust tuning theory and system design technical articles. The emphasis throughout the paper is on the use of theory to guide practical design. Welldesigned exhaust systems collect exhaust gases from engine cylinders. By varying the muffler design parameters the flow will be analyzed.
The aim of intake and exhaust system design is to control the transfer of acoustic energy from the sources and its emission by the system with minimal loss of engine performancea rational design process depends on the adoption of a design methodology based on predictive modelling of acoustic behaviour virtually any system geometry can be modelled. Article beginning new generation 6cylinder n52 introduction beginning with the n62 v8 engine, bmw has introduced a new generation of engines with advanced concepts. Exhaust and muffler design of a formula sae car horsepower. Muffler design types fall into three basic categories. The exhaust system of diesel engines required to operate in an electrically classified area are, therefore, required to be modified so they will not act as an ignition. Feb 08, 20 watch the animated video showing the working of an exhaust system inside a car. So whether you have a 50cc road bike, a 500cc motocrosser or a classic racer. In all muffler designs the tailpipe length can have an important effect. Advanced twostroke tuned exhaust system the challenge the society of automotive engineers clean snowmobile challenge 2002 sae csc 2002 is an engineering design competition for college and university student members of the society of automotive engineers sae. 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. Intake and exhaust tuning reducing tuning theory to. As a result, the final goal for finding an optimal shape of the exhaust manifold is to minimize the tsi. Mufflers are important part of engine system and commonly used in exhaust system to minimize sound transmissions caused by exhaust gases.
Pdf design and analysis of an automobile exhaust muffler. There are several other terms in usage today, like turbo, bullet and multiple baffle. Recirculating hood system ductless hoods or ventless hoods a selfcontained air exhaust system that removes grease, vapors, fumes, smoke, steam, and odors from the. For example, if the engine produces 425 hp, the exhaust system should be able to flow about 935 cfm. The primary focus of these engines was the use of valvetronic which has revolutionized valvetrain technology. One of these techniques is a bimodal exhaust system, meaning it has two passages, that the exhaust can travel through the muffler. Pdf basic design methodology for muffler design, development. Look into the fluid dynamics involved in generating scavenging and. Aug 16, 2015 you need the right plan, exhaust system design, and component selection.
The current capstone team is designing and building a new exhaust system that will not. Engine builders and car owners carefully consider the exhaust layout, select the parts, and fabricate the. Summary of exhaust theory exhaust system basics sport. Exhaust only hood system low initial cost makeup air available from existing hvac good performance if make up air is provided properly. Is there a good online resource for exhaust system design. Mastering exhaust system math to build highperformance engines. Most of the advances in theory of acoustic filters and exhaust mufflers have been developed in last two decades.
Its obvious supersprint produces one of the best exhaust system in the world. Exhaust system muffler diesel engine exhaust systems often reach a surface temperature of 350600c 6621112f, which may be capable of igniting flammable substances. You cannot simply select a random collection of exhaust parts and expect to realize top performance. This paper discusses the general principles of muffler design and explains the main advantages of various styles of. Flexible connections should be installed as close as possible to the engine exhaust outlet.
However, the theories and science that has undergone development in. Jun 01, 2004 summary of exhaust theory exhaust system basics. Many years ago stewart used electro acoustic analogies in deriving the basic theory and design of acoustic filters 1. Exhaust system components are designed for a specific engine. Design and analysis of intake and exhaust system of sae supra.
Jan 19, 2011 in this months enginology section circle track contributor jim mcfarland reduces intake and exhaust system tuning theory to practice circle track magazine. Mastering exhaust system math to build highperformance engines january 24, 2015 by muscle car diy exhaust systems dont generally invoke the glamour and gut level appeal associated with many highperformance induction systems, but they certainly play a. Only lately have computer programs like the burns xdesign or high end engine simulation programs been able to help in this process. While designing exhaust system main attention is given to design a muffler to reduce the noise and back pressure. Significant intake noise emission is sometimes restricted to the first two or three such harmonics. Pdf design principles for an automotive muffler researchgate.
Design of mufflers and silencers noise and vibration short course dept. Each exhaust system is manufactured to exact industry leading standards of excellence. To extract maximum performance, an engine needs an efficient, welldesigned, and properly tuned exhaust system. You need the right plan, exhaust system design, and component selection. 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. Exhaust and muffler design of a formula sae car free download as powerpoint presentation. Scientific design of exhaust and intake systems engineering. When you look at a supersprint exhaust system you can see the attention to detail, the quality materials, precise welds, rather than crimped seams, and the superb finish. This authoritative book will lead you through the complex theory to an understanding of how to design highperformance exhaust and intake systems for your own particular application. A high intensity pressure wave generated by combustion in the engine cylinder propagates along the exhaust pipe and. Muffler, engine exhaust noise reduction, design design and construction of a muffler for engine exhaust noise reduction.