Catch Cans

[CrazyHippie]

I think what confuses people is there should never be a vacuum inside the intake tube between the air filter and the throttle body. If there is a vacuum it means the air filter is plugged or simply not big enough to handle the air flow.

Thanks! Its more of a venturi effect, apparently rather than a negative pressure? Fascinating, and thanks for your patience with me. I'm sure this has been discussed before, but I'm a little new to the forum. There is so much knowledge here!

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[PoCoBob]

Thanks! Its more of a venturi effect, apparently rather than a negative pressure? Fascinating, and thanks for your patience with me. I'm sure this has been discussed before, but I'm a little new to the forum. There is so much knowledge here!

Yes there would be a venturi effect because the air moving through the tube would cause a low pressure zone. But as long as the tube is properly sized there shouldn't be that much suction created. Keep in mind the other side of the engine with the PCV valve is attached directly to the intake manifold so there is full vacuum on that side of the system as opposed to a few lower PSI in the intake tube.

 

[CrazyHippie]

Yes there would be a venturi effect because the air moving through the tube would cause a low pressure zone. But as long as the tube is properly sized there shouldn't be that much suction created. Keep in mind the other side of the engine with the PCV valve is attached directly to the intake manifold so there is full vacuum on that side of the system as opposed to a few lower PSI in the intake tube.

Got it! Makes sense!

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