Quote:
Originally Posted by Kingtal0n
naw man, you got to check the physics. Suction is not suction lol. think of an engine running without a turbocharger. Before the throttle body, there is suction right? Because the engine is breathing. But there is no VACUUM. The engine is pulling air molecules into its intake manifold- past the throttle body, yet before any actual vacuum can be built the air molecules are replaced by the atmosphere.
The same thing happens to the inlet of a turbocharger. The air filter defeats any actual attempt at building a vacuum. You get a SLIGHT pressure drop- but Its got to be less than 2" of vacuum. No ones actually measured it right? So we are guessing until I do an experiment.
The factory uses it because its the ONLY place to get ANY vacuum at all anywhere on a turbocharged engine in boost. Notice the inlet tube is small, the hose is small, the whole thing is lengthy. This would help acquire a slight vacuum during boost, when compared to the atmosphere.
whats funny is, you could always install a more restrictive air filter to get more of a vacuum in the tube during boost. It would hurt power output but improve PCV during boost.
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The point is not to build vacuum, as what you're stating is correct. The point is to generate flow. You can then use the intake like a venturi in a carb, and draw air through the system using the intake flow. The closer to the turbo the better essentially, as long as your catch can is able to keep the oil and vapors separated.
This is why exhaust evac works as well, no vacuum, but lots of flow. Again, as long as you can keep oil from disappearing out the exhaust.
You should always use a nozzle with a slit in it for either. Like this:
This guy has tested it. No vacuum, but less crank case pressure with his compound setup.
http://www.dsmtuners.com/forums/cust...on-system.html