Quote:
Originally Posted by Dark Sarcasm
even if the water "boils off" isnt it going to condense back into water in the crackcase or valve covers? i guess some could escape thru the exhaust but more moist air is being brought in by the intake at the same time.
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The PCV system is what ventilates the crankcase's air. In the stock setup, the PCV draws fresh air from side hoses on your air intake tubes (past the filters, but before the throttle plates), and exhales "used" crankcase air (full of fuel/oil vapors, and some water vapor too) back into your intake manifold (after the throttle plates) to be burned in combustion. It's mostly to regulate pressure (so that blowby doesn't build up pressure in crankcase and blow out an oil seal), while also controlling emissions (or else you'd just vent the excess crankcase pressure to the outside air directly).