Venturi pipe in engine exhaust flow

In summary, the conversation is about creating a vacuum in an exhaust gas stream for crankcase exhaust ventilation. The person is considering two setups, one with a pipe cut and the other without, and they are seeking opinions on which would work better. There is a discussion about the effectiveness of these setups and the potential for back pressure in the crankcase. The person believes that the setup without the pipe cut would create a better vacuum signal. There is also a mention of using a flame trap to prevent a crankcase explosion. Another person suggests that a smaller hole in the exhaust pipe would provide a partial vacuum without penetrating the exhaust flow too much. There is also a question about the normal pressure in a vented crankcase and the exhaust pipe, as
  • #1
Dteeter
1
0
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I would appreciate opinions on this...on which setup would create the best vacuum in an exhaust gas stream? The #1 drawing is a pipe that has a birds eye cut in it. These are sold for engine crankcase exhaust ventilation. There are some that say they work, then others that say they don't work and actually created back pressure in the crankcase. I personally think that #2 would work much better...a better vacuum signal. Thank you.
20190815_135233.jpg
 
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  • #2
Do you intend to use the vacuum for crankcase exhaust ventilation? If so you will need a flame trap to prevent a crankcase explosion.

I do not think you need to penetrate the exhaust flow to such a significant extent. A hole, flush with the internal surface of the exhaust pipe should provide a partial vacuum.

What is the normal positive pressure in a vented crankcase? What is the normal pressure in the exhaust pipe?

Why do you not vent the crankcase to the inlet manifold and burn the blow-by products to reduce emissions?
 

FAQ: Venturi pipe in engine exhaust flow

1. What is a Venturi pipe in an engine exhaust flow?

A Venturi pipe is a type of tube that is used to increase the velocity of air or fluid passing through it. In an engine exhaust flow, a Venturi pipe is used to create a vacuum effect, which helps to improve the efficiency of the engine by increasing the flow rate of exhaust gases.

2. How does a Venturi pipe work in an engine exhaust flow?

A Venturi pipe works by creating a constriction in the flow of the exhaust gases. This constriction causes the gases to speed up as they pass through the pipe, creating a vacuum effect behind the constriction. This vacuum effect helps to pull more exhaust gases out of the engine, resulting in improved engine performance.

3. What are the benefits of using a Venturi pipe in an engine exhaust flow?

The main benefit of using a Venturi pipe in an engine exhaust flow is improved engine efficiency. By increasing the flow rate of exhaust gases, a Venturi pipe helps to reduce back pressure in the engine, which can result in increased power output and better fuel economy. Additionally, a Venturi pipe can also help to reduce emissions from the engine.

4. Are there any downsides to using a Venturi pipe in an engine exhaust flow?

One potential downside of using a Venturi pipe in an engine exhaust flow is that it may increase the noise level of the engine. The increased flow rate of exhaust gases can result in a louder exhaust note. Additionally, if the Venturi pipe is not properly designed or installed, it can cause turbulence in the exhaust flow, which can negatively impact engine performance.

5. Can a Venturi pipe be added to any engine?

In theory, a Venturi pipe can be added to any engine with an exhaust system. However, the design and placement of the Venturi pipe are crucial for it to be effective. It is recommended to consult with a professional mechanic or engineer before adding a Venturi pipe to your engine's exhaust flow.

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