The effect of a catch can on oil leaks

[Trav_1980]

PCV shouldn't be vented to atmosphere, that defeats the whole purpose.

The whole concept of PCV is that the gas blow by from the cylinders into the crankcase is 'positive' vented back thru the induction to be burnt and not dumped direct to atmosphere.

There should be a PCV valve in the vent line from the rocker back to the induction point and the Catch Can has the job of capturing the oil condensate so it doesn't reach the induction and foul the engine intake.
When you fit the Catch Can you still need the downstream flow after the Can to go to induction not atmosphere

Yep I'm aware of all that, my D40 has a Provent fitted and it works great, that's why I'm fitting one to this vehicle I have purchased which doesn't have one and needs one. The previous owner had just vented the PCV pipe to the atmosphere and hadn't fitted the can due to lack of space but now I'm onto it and itll be plumbed as it should be back into the intake.

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