NORMALLY ASPIRATED engines benefit even though boost is not present!
The crank case vacuum produced greatly increases engine efficiency, piston ring seal, performance, & lowers emissions.

straight from the krankvent website

 

Yeah - if I were them I wouldn't mention anything about gaskets or seals either.:wink:

 

now you got me all paranoid haha

 

so I just did the "modified" supra pcv valve. My stock valve was all gummed up and now I found where my vacuum leak was. I could blow both ways thru the stock valve..not good. My car runs back to normal now, and part throttle acceleration seems at its best, and my clutch pedal is back to normal. It could all be the placebo effect but my clutch pedal engage point not bouncing around is def. not.

 

I honestly cannot believe so many of you guys are running the PCV valve to your intake manifold. Let me just me just say that is the stupidest idea ever. I don't care what PCV valve you use, they can always leak or malfunction and then you will end up pressurizing your crankcase. Don't wast your $$ on crank vents, PCV, or check valves. Remove all valves and run direct lines to a catch can with a drain back system and stop risking you rings and seals.

 

That has to be the stupidest thing i have heard......... In saying that any future posts by you will be a waste of time.

 

Yeah, it's soooo stupid. Check valves work, and rarely fail. My supra pcv holds compressed air @ 25psi with 0 leakage. Catch cans are nice, but don't crap on this idea because you don't trust it. Toyota trusted them to hold back boost. It's cheap and easy.

 

 

You guys crack me up

 

There is neither vacuum nor positive pressure in the valve cover due to the wide open breather line running to my intake. The oil drains being in the head vent the crank case as well. The supra valve stops a boost leak and prevents the boost pressure from blowing all the atomized oil out of the head and right into the intake. The side effect is that the crank case doesn't see boost, but even if the valve fails there is a 3/8" hole in the valve cover that prevents bad things. I guarantee you would hear that if the valve failed. There is no held pressure in this system. Even with a check on the breather line it still allows positive pressure to run out of the block.