Background information on engine blow-by

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SUMMARY

This discussion centers on the measurement and management of engine blow-by, specifically in the context of the Lancer Evo 8. Blow-by gases typically exit the crankcase and are routed into the intake system after the Mass Air Flow (MAF) sensor, passing through the turbocharger and intercooler before being combusted in the engine. This process can lead to oil coating the intercooler, reducing its efficiency, which can be mitigated by installing a catch can. The routing of blow-by gases varies by engine design, with some systems venting directly to the atmosphere or utilizing filtration and oil separation systems.

PREREQUISITES
  • Understanding of internal combustion engine design
  • Familiarity with engine components such as turbochargers and intercoolers
  • Knowledge of blow-by gas management techniques
  • Experience with automotive performance modifications, including catch can installation
NEXT STEPS
  • Research the installation and benefits of catch cans in automotive applications
  • Learn about different engine designs and their blow-by gas routing methods
  • Explore the impact of blow-by on intercooler efficiency and performance
  • Investigate filtration and oil separation systems for managing blow-by gases
USEFUL FOR

Automotive engineers, performance tuners, and mechanics interested in optimizing engine efficiency and managing blow-by emissions effectively.

uk_samo
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Hi
I am currently doing a project looking at the measurment of engine blow-by. Any information about this tha anyone can give me would be most appreciated. In particuar where does the blow-by go when it comes out the crankcase attached to the engine? thanks for your time
matt
 
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uk_samo said:
Hi
I am currently doing a project looking at the measurment of engine blow-by. Any information about this tha anyone can give me would be most appreciated. In particuar where does the blow-by go when it comes out the crankcase attached to the engine? thanks for your time
matt

in my car (lancer evo 8) the blow-by goes into the intake after the MAF. through the turbo, intercooler, throttle body, and the blow by is burnt in the engine. admittedly this coats the intercooler in oil - decreasing its efficiency, which can be solved with a catch can.
 
Where the blowby gases go depends on the engine design. Some (as mshinavar stated) feed the gas back into the inlet tract of the engine. Some vent the gases to the atmosphere directly, or through a filtration and oil separation system.

Depends on the engine.
 

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