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# Back pressure & length calculation in automotive exhaust

Back pressure calculation process in exhaust systems with example

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### Back pressure & length calculation in automotive exhaust

1. 1. Back Pressure & Length Calculation in Automotive Exhaust Piping Ahmadreza Aminian 1
2. 2. First Things First….  The exhaust piping layout begins with silencer location which should be in relation with tailpipe length. In order to obtain the best noise reduction, there should only be a short tailpipe after the silencer as shown in the graph:  For all-speed engines, read the specified maximum speed for the engine  For single-speed engines, read the operating speed of the engine 2
3. 3. Determining the longest length of tailpipe (source: ) 3
4. 4. Examples of long exhaust systems (i.e. longer than 5 meters) 4
5. 5. Exhaust back pressure  The back pressure in the exhaust system must not exceed the maximum recommended exhaust back pressure, including silencers. A higher exhaust back pressure leads to increased fuel consumption and a loss of power.  The maximum recommended exhaust back pressure is 100 mbar for all engines. exhaust back pressure in mmH2O. 1,000 mmH2O is equal to 100 mbar. 5
6. 6. Calculation example6
7. 7. Graph for calculating additional length in exhaust system 7
8. 8. Calculation process (source: )  Backpressure is calculated by: 8
9. 9. Calculation process9
10. 10. Calculation Process (Equivalent Length of Straight Pipe)  To obtain equivalent length of straight pipe for various elbows: 10

Jul. 9, 2019
• #### TrungHiu63

Mar. 24, 2019

Nov. 8, 2017
• #### suren_pet

Jun. 10, 2017
• #### DeveshoanMichael1

Feb. 22, 2017

Back pressure calculation process in exhaust systems with example

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