crank case ventilation

[zydeco]

Originally posted by richiep
Since being told this I have noticed that every production car I have seen has the crank breather connected to the induction system in some way - must be a reason for it.

I think this is usually done for emissions purposes on newer cars (since the mid 70's in the US) to prevent hydrocarbons from the crankcase from venting to the atmosphere. Still a good idea though. The only drawback is the added potential for getting the carbs fouled.