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The Terminator
Engine/Tuning
Quick Oil Catch Can Question
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<blockquote data-quote="SnakeBit" data-source="post: 11353498" data-attributes="member: 2522"><p>Another thing which makes it difficult to do a catch can on passenger side is that air flow can reverse direction depending on boost or no boost. That will make it difficult for a catch can to work properly (although it can be done).</p><p></p><p>On the driver's side, the PVC "tries" to act like a check valve to only allow flow from valve cover to intake. It's that one-way air flow which makes the catch can effective.</p><p></p><p>Most catch cans I've seen have a screen at the inlet to the body of the can (looks like very coarse steel wool). Oil condenses on this screen then falls down into the bottom of the can where it collects. If the can is large enough, and has no screen, it can work by utilizing pressure differential between the inlet tube and the body of the can. When the flow exits the inlet tube into the body of the can, it encounters a pressure drop which causes the oil droplets to group together then fall to the bottom of the can. As oil fills the can, and it's empty volume gets smaller, the pressure drop also gets smaller causing it to be less effective. Eventually, if not emptied out, it will stop working altogether.</p></blockquote><p></p>
[QUOTE="SnakeBit, post: 11353498, member: 2522"] Another thing which makes it difficult to do a catch can on passenger side is that air flow can reverse direction depending on boost or no boost. That will make it difficult for a catch can to work properly (although it can be done). On the driver's side, the PVC "tries" to act like a check valve to only allow flow from valve cover to intake. It's that one-way air flow which makes the catch can effective. Most catch cans I've seen have a screen at the inlet to the body of the can (looks like very coarse steel wool). Oil condenses on this screen then falls down into the bottom of the can where it collects. If the can is large enough, and has no screen, it can work by utilizing pressure differential between the inlet tube and the body of the can. When the flow exits the inlet tube into the body of the can, it encounters a pressure drop which causes the oil droplets to group together then fall to the bottom of the can. As oil fills the can, and it's empty volume gets smaller, the pressure drop also gets smaller causing it to be less effective. Eventually, if not emptied out, it will stop working altogether. [/QUOTE]
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