When I upgraded my pre-turbo intake piping
I removed my crank case breather connection to the pre-turbo pipe.
The original system is designed for emission reasons to vent the crank
case oil fumes to the intake so they can be burnt. But the oil vapor will
collect on the intake piping and on the intercooler this will reduce the
heat transfer rate. The oil vapor can also have the effect of lowering the
octane rating of the fuel if enough is sucked into the engine. So venting
the crankcase is not great for performance, but it is still necessary that
it is vented somewhere.
My first fix was to simply add a small breather filter to the end of the
crank case vent. It fit very well and worked fine. But after a few months
the filter began collecting oil and then dripping and spraying it around
my engine bay. It eventually ruined my cabin air filter and made a mess.
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