What is Exhaust: Definition and 132 Discussions

An exhaust system is used to guide reaction exhaust gases away from a controlled combustion inside an engine or stove. The entire system conveys burnt gases from the engine and includes one or more exhaust pipes. Depending on the overall system design, the exhaust gas may flow through one or more of:

Cylinder head and exhaust manifold
A turbocharger to increase engine power.
A catalytic converter to reduce air pollution.
A muffler (North America) / silencer (UK/India), to reduce noise.Aftermarket exhaust parts can increase peak power by reducing the back pressure of the exhaust system. These parts sometimes can void factory warranties, however the European Union Block Exemption Regulations 1400/2002 prevents manufacturers from rejecting warranty claims if the aftermarket parts are of matching quality and specifications to the original parts.

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  1. A

    Macroscopic shape of rocket exhaust

    Greetings to everyone. I would like to ask how the shape of a rocket exhaust plume changes with distance, when the rocket operates in a vacuum. What I'm mainly looking for, is to see how large the diametre of the plume would be at a distance of ~20km from the nozzle. We're assuming an ordinary...
  2. Lavid2002

    Calculating Exhaust Flow Rates

    Hello everyone, I have been trying to calculate some exhaust flow rates for a while, and I am having some issues here. I was wondering if anyone could provide any insight. I am making a few assumptions for this calculation. I am assuming no fuel or air is lost through blow by gasses into the...
  3. N

    Heat Recovery from Boiler Exhaust Gases

    Homework Statement The exhaust gases from a natural gas-fired central heating boiler leave the boiler at a temperature of 70 deg C. The oxygen content of the exhaust gases is 9% by volume (dry). The rate of energy input (Gross calorific value) to the boiler from natural gas is 16kW. The gross...
  4. I

    Automotive Car exhaust, gas flow system in the car,air pollution filter

    In this time I try to search after information about 2 things: 1. the gas flow system in the car and the car exhaust 2. the materials that use in air pollution filters If you know good website / professor / paper / book / video lecture / other in one of this area so I will glad if you can let me...
  5. I

    Restricting exhaust flow causing temperature increase?

    We have a situation. Someone modified the exhaust pipe from a diesel fired equipment. Exhaust gas flows out through a 30mm internal dia pipe. The modification carried out was to reduce the diameter of the pipe to 20 mm internal dia. The Exhaust outlet temperature from the equipment was 400 deg...
  6. P

    Dew point and exhaust temperature

    Homework Statement I'm trying to find some information on "How does the dew point control the exhaust temperature of a thermodynamic cycle?" Homework Equations "The dew point is the temperature at which the water vapor in a sample of air at constant barometric pressure condenses into liquid...
  7. Swartz55

    Trouble calculating effective exhaust velocity

    So I'm trying to calculate the effective exhaust velocity of an engine which burned aluminum oxide and hydrogen gas at a barebones minimum temperature of 973.15 degrees Kelvin (700 C, the ignition temperature) The formula I have for specific impulse is TcxRgas, where Tc is combustion chamber...
  8. R

    Thrust from model engine exhaust

    I’m interested in your views on whether any significant thrust could be obtained using the cooling air and exhaust gases from a model aircraft engine. International class control line speed models (known as F2A) achieve speeds of around 300 km/hr using 2.5cc engines and tuned pipe exhausts that...
  9. Y

    Exhaust Acoustics for Subaru WRX 2.0L Turbocharged Engine

    Hello, I am working on a custom car project, and will be using a Subaru WRX 2.0 liter turbo charged engine. I did a search under the question I am looking for an answer to, but only found one thread that was closed. I hope you all might be able to educate me, on what my possible options are. I...
  10. S

    Room Pressure from Ventilation & Exhaust Rates

    If I am trying to estimate a room pressure (not having any measurement devices), could I estimate it as follows: Vo = Volumetric Air flow rate supplied into Room Ve = Volumetric Air flow rate exhausted from Room out to atmosphere Pf = Static Pressure Capability of fan Pr= Pressure of...
  11. N

    How Do I Make a Grossly Overexpanded Rocket Nozzle Exhaust Jet Stable?

    I have a question regarding the design of rocket nozzles. I am not an engineer nor a physicist but I am involved in amateur experimental rocketry and I was curious regarding grossly overexpanded nozzles. According to Wikipedia a grossly overexpanded rocket nozzle (very bottom of the...
  12. marellasunny

    Number of moles equation in exhaust gas

    I've been given information that the exhaust gas contains only water and no HydroCarbons. So,the only hydrogen composition found in the exhaust gas is in the water. Similarly,the hydrogen in the air coming-in is only found in the water molecules as the incoming air is pure and without any fuel...
  13. P

    Vibration Control in Exhaust System

    I am doing a project in controlling the vibration in 4 wheeler exhaust system by using dampers. But i am not sure of what kind of dampers to use. Also is it possible to add multiple dampers and one just near the exhaust manifold.
  14. S

    Temperature & Pressure at Exhaust of IC Engines

    what will be the temperature and pressure at the exhaust of IC engine?
  15. S

    How is the average exhaust gas velocity determined in complex nozzle designs?

    Hi Can someone tell me how exactly (physically and mathematically) is the nozzle exhaust plane defined? I “understand” the principle with simple circular openings, but not the more complex shapes (such as in the links below)...
  16. marellasunny

    Stoichiometry-calculation of mass fraction of water in exhaust

    Homework Statement An engine is operated with a special fuel mixture solely composed of carbon, hydrogen and oxygen. A fuel breakdown showed the following values: mass fraction carbon mass fraction hydrogen ,fuel density c = 0.81 h = 0.15 ρ=0.75 kg/dm³ fuel mass flow rate m_b=2 g/s relative...
  17. B

    Problems with lagged turbo and exhaust systems

    hello, does anyone know if lagging a turbo and exhaust system would cause failure of the turbo. my thought is that on the lagged turbos the heat can not disperse causing early failure due to expansion of the casing, bearings and shafts. could it also effect the oil viscosity ? any thoughts...
  18. Crazymechanic

    What is the design of the Bussard Polywell reactor's helium exhaust system?

    Hi could someone please tell me the Bussards polywell reactor helium exhaust system design. Like what is the model how did he planned to achieve it and if possible some explanation? Thanks.
  19. M

    Copper or Brass exhaust manifold.

    Hello All, I am drawing up a design for a water-cooled exhaust manifold for a small engine. It would be a simple design of an exhaust exit pipe mounted to a flange, with a tubular copper heat exchanger liquid filled coil wrapped around the exit pipe right near the cylinder. The copper would...
  20. I

    Calculating Exhaust Flow for Diesel Engines

    Is there a way you can calculate exhaust flow using intake flow and exhaust temp? Maybe I would need fuel quantity as well. I just need a rough idea.. It's for on a diesel.
  21. R

    F-35 Jet Exhaust: Supersonic Takeoff/Landing?

    When the F-35 is taking off or landing vertically, are any of the jet exhausts supersonic? I have seen the amount of thrust they produce but nothing about the Mach number. I am not looking for anything specific just whether or not the exhausts are supersonic.
  22. S

    Boiling Ethanol & Using a kitchen exhaust hood instead of a fume hood

    Hi, I'm doing a lab at home on photosynthesis for biology, in which I have to boil leaves in ethanol, and I have a few questions about safety for this. First of all, is it at all safe to actually boil denatured alcohol/ethanol, especially where people might inhale it? And depending on how safe...
  23. I

    How does a turbo use heat from the exhaust?

    So I realize that the engine produces pressure but most of the time this pressure is 1:1 with the boost pressure when the turbo is actually doing its job (higher engine speeds/loaded). This raises the question about how you can gain efficiency if the boost you make is used for drive pressure...
  24. S

    Deleting exhaust crap off my bike

    Long story short I am deleting the exhaust crap off my bike to do so I need to trick my ECU into thinking its still there. I need you guys to help me figure out what I need to do so... Please refer to paint shop drawing If you could talk me though it or draw me up something It would be much...
  25. F

    Exhaust and engine accoustics for asthetics and performance

    This is all in relation to a 90 degree v8 I am looking for the highest frequency/note/tone/pitch I can get. I very much enjoy the higher, crisper, cleaner sound the european v8 makes. I hate with a passion the rumble of the harley/dumptruck American v8. I have heard flowmasters on these cars. I...
  26. F

    How to find the Force of a Car's exhaust?

    Hey guys! I'm brand new to the forum and looking for some advice. For full disclosure, I am actually an Economics major, but I absolutely love learning about mechanical engineering; more specifically automotive mechanical engineering. Haha. I have been looking all over the web for about a month...
  27. R

    Non-condensing steam recovery from exhaust gas?

    Cyclonic separators can be used to collect water in after-treatment when hydrocarbons are burnt, but (for one thing) this expends energy in cooling the walls of the cyclone. Is there a means to, say, use a similar effect of centrifugal force to concentrate the water molecules near the outer...
  28. Y

    Custom exhaust for a WRX powered kit car

    Hello all, I am nearly finished with my AA, and next year I will start school at VRI at WWU. I can't wait! Until then I am working on a private project. A 1970's Kit car called a Sterling. Due to expense I cannot make this car a mid engine, so I am staying with a rear engine configuration...
  29. P

    How Quickly Do the Exhaust Gases Coming off a Fire Cool Down?

    While trying to deduce the answer to a physics-related (and safety-related) question, I ran across an apparent paradox. I am trying to figure out how quickly the hot gases rising off of a fire cool down. From what I had heard from atmospheric science: 1. Air is a lousy conductor of heat. 2...
  30. L

    Fuel velocity vs exhaust velocity difference?

    hi all, i've been confused about what the difference is between fuel velocity and exhaust velocity. apparently, fuel velocity is equal to rocket velocity minus exhaust velocity. attached are screenshots of the textbook reading that confused me. if anyone can explain this section to me, i...
  31. Y

    What is the chemical formula for car exhaust emission

    What is the chemical formula for car exhaust emission
  32. Y

    Are Car Exhaust & Oxygen Identical Except Temp?

    Is oxygen that comes out from a car and regular oxygen the same (exactly identical) except that one is warmer than the other?
  33. F

    Otto cycle exhaust heat rejection

    Hello All! I am new to the forum and need help. I have looked at multiple sites an looked at 328 threads titles and about 20 actual threads today to find the info I was looking for...no luck. Here is my question: I have a 12.5KW natural gas generator and want to know much heat and I can...
  34. A

    Turbine suitable for exhaust waste heat recovery

    hey guys, i m new here, i m working at recovering waste heat from exhaust from an automobile using a heat exchanger and then turning a turbine using a working fluid such as steamor refrigerant but still mnot sure which turbine will be suitable for me to use considering the dimensions of the...
  35. J

    Can Microturbine Exhaust Be Safely Cooled for Pedestrian Areas?

    Hi guys, not sure if this is in the correct section but I'll go ahead anyway. I'm working on an automotive design project. The car that I'm designing has twin micro jet turbines, like the Jaguar CX-75, to charge and power the electric motors propelling the car. The problem that I'm trying...
  36. F

    Automotive Small block Chev (classic) exhaust notes/tuning physics etc

    Somewhere in a dark corner of the "internet" lies a video of somebody that somehow crossed the leads from the header pipes so instead of all the primaries going into one collector some go into the other side collector...that produced a very exotic sound. Can someone tell me a little more...
  37. H

    Automotive HELP: High Performance Free Flow Exhaust For Single Cylinder (153cc) Engine

    Before I Start here is a disclaimer - I am not a professional CAD or Mechanical Engineer to know much about this. Also, All information I have is from the internet and have NO practical knowledge. Here we go then. I am currently working on building a High Performance Free Flow Exhaust...
  38. B

    Steam generator on the exhaust pipe of the car ( cogeneration )

    I'm trying to do the concept of a turbosteamer that the bmw is workking on but I'm facing few problems : the flow rate of water will be 9 ml/s and of pressure 6 bars . based on htri xchanger program , the best design of my shell and tube heat xchanger will be of 22 cm diameter and 6.4 mm tube...
  39. R

    I'm trying to figure out how to sequester CO2 from furnace exhaust

    My plan is to burn bio-matter like weeds and wood (or bio-fuel) in a zero-pollution scheme that collects the particulate material, oil, water and CO2 generated from burning the hydrocarbons and uses it for other purposes. It would filter out any toxins or NOx and vent N2. I know that I can...
  40. C

    Exhaust air flow parameters for car engines (otto & diesel cycles)?

    Does anyone know any sources (i.e. car manufacturers) that provide the exhaust air flow parameters for the some specific car engines? I need stats on various otto & diesel cycle engines (small compact car engines, large semi truck engines, etc.). When I say exhaust air flow parameters, I need to...
  41. J

    How Can I Calculate Rocket Exhaust Temperature?

    Does anybody know how or where I can find a way to figure the Exhaust Temperature of a Rocket. I am considering a problem where I assigned 1.4 atmospheres to the Inlet gas pressure at 300 degrees C. That it exited into 1 Atmosphere at exit velocity of 325 M per second.
  42. D

    More efficient house: heat with the clothes dryer exhaust

    Hi all, I am looking for ways to make the house more efficient in winter. Are there any disadvantages to piping the clothes dryer exhaust into the house instead of outside? I do understand that there exists a small quantity of lint in the exhaust, could that be dangerous (breathing, flammable)...
  43. M

    Designing Exhaust w/ VR6: Finding Velocity

    So, I'm still working on designing an exhaust. The engine I'm using is the VR6, non-turbo, etc. I want to design the exhaust only under full throttle. This way I can over-design the exhaust rather than under-designing it. I'm really not sure how to find the velocity of the exhaust as it...
  44. B

    Exhaust Temperature Range & Efficiency for 48cc 4-Stroke Gas Engines

    I wanted to know what exhaust temperature range would i get with a 48cc 4 stroke single cylinder gasoline engine operating at standard parameters. Also, what variation in engine efficiency would i get by varying exhaust temperatures using water as a coolant?
  45. M

    Analysis of thermal and pressure stresses in y exhaust

    Hey, i just have a couple questions that need answers. Below I have a list of notes I have taken whilst researching how to analyze thermal and pressure stresses in a y bar exhaust. Things I need to design include the valve and the exhaust pipe itself. Am I missing anything to analyze? About...
  46. smokingwheels

    Is this a good rule of thumb for engine exhaust temperature

    I have done a basic test on my car at idle and have found that the exhaust pipe temperature just hits 100 deg C eg boiling point of water 1050mm away from the exhaust port. Is this a good guide to exhaust gas temperature? Can you compare other engines using this method? I also can hang...
  47. F

    Automotive Acoustics engineering: Automotive exhaust harmonics

    I thought I would try to discuss this here since there seems to be a large misunderstanding in automotive forums and I want to learn the reality, not someone's theory. basically, I have a car here in which we removed one of the many mufflers. Piping is constructed as 2-1-2. It converges to...
  48. J

    Optimizing Heat Exhaust Capture for Natural Gas Fired Industrial Heaters

    Given a natural gas fired industrial heater dryer which gives off 70,000 CFM of 190F air at 1.1 atm air pressure, is it practicably possible to capture 24 hours worth of this heated air exhaust into a compressed storage tank? How would I calculate the theoretical maximum compression ratios...
  49. C

    Exhaust Pipe Sizing for 1997 Pontiac Trans Am WS-6

    I am trying to get some help in sizing my exhaust pipe for my 1997 Pontiac Trans Am WS-6 Can anybody point me in the right direction for equations? I pulled out my Marks handbook hoping it would help, but I couldn't find anything I have been thinking of doing this as a gas dynamics...
  50. D

    Exhaust pressure on over-run (bernoulli's principle?)

    Hi all, I have a car with a straight through exhaust, consisting of a 4 into 1 manifold, a single pipe, then a single silencer. Between the manifold and silencer is a join. When i am driving on over run (closed throttle, decellerating) i know this joint sucks air in, as the exhaust makes a...
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