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[Adrian]

Malc,



yes you do seal them off, as I mentioned in my first post! Like I said, people have various preferences, the version I showed is simple, but the advantage of the method Pete F advises is that it allows more of the oil mist to condense and run back down into the oil tank under gravity. The main thing is that all the crankcase fumes have an easy passage on their way out, and there is no part of the system where blockages of oil and water emulsion (the mayonnaise) can form.



A.

[Frank]

I pay good money for non fling chain grease so rather than dilute it with acidic moisture laden oil I have kept the catch can, removed all pipes from it bar the main crankcase breather, and in their place put drain hoses to route the muck to the ground in more of a controlled manner. The can is high enough to discourage much loss and has a duckbill valve already in it. The important thing is to break the cycle of recirculating the moisture back through the system and vent it to air instead. Block up the hole on the airbox which is on the unfiltered side. Never had a blocked pipe since, and in reality only lose a spot or two of oil after a good run.