PCV elimination with RRE catch can

[MyBeatGSX]

I believe it was Taboo or RRE that did this. They ran both the breather and the PCV (without an PCV valve) into that RRE style catch can. But RRE says that mod is for racing use only. So is that "for racing use only " or do they actually mean it.

I originally thought PCV was important for help with ring seal, blowby, etc. But I've been reading about it and it seems to be purely for emissions. Like everyone else I could careless about emissions.

So what are the pro's and con's with this mod? If it effects nothing other than emissions, offers more venting under boost, and keeps all oil out of the intake tract.... I see no reason not to do it...

 

[Dream On]

It wouldn't hurt, as long as you cap off where it plugs into the intake manifold. I've heard some people argue that it is getting rid of metered air though. I say do it if you want to though.

 

[MyBeatGSX]

If both are hooked to the catch can, then none of the air should be metered, it should be completely separated from the intake air.

Is it possible to smash out the insides of an old PCV and use that as the fitting? And is there any truth to the ring sealing issue?

 

[underradar92]

Is it possible to smash out the insides of an old PCV and use that as the fitting? And is there any truth to the ring sealing issue?

I've heard of people gutting their pcv valve in the fasion you describe, though I don't know what technique they used. Pressure behind (under) the rings does lower ring seal by decreasing the pressure differential that helps push the rings outward during the power cycle. If you want to know if it works, just look at any Pro Stock car, They actually use a belt-driven vacuum pump to create a vacuum in the crankcase. I've read that in some applications, (big inch nitrous cars) it's worth over 50 hp! Angelle Savoi's P/S bike ran 3 electric ones, till NHRA limited them. So yes, it does matter, absolutely. BTW. the pcv is closed under boost, if its working right.

 

[MyBeatGSX]

That's exactly what I thought. But since its not open under boost you aren't really getting the vacuum benefit when you need it.

If anyone is wondering, I called RRE and asked them... "Yes its just for emissions. If anything, getting rid of it is good for the car."

 

[t0ny007]

The PCV effectively and simplistically takes out unwanted, harmful blow-by in your crank case and removes it via vacuum in the intake manifold. This feature is not in function under WOT. In fact once the intake manifold reaches 1psi, it is theoretically closed and not in use. Taking out the PCV system seems pretty dumb to me.
http://dsmtuners.com/forums/showthread.php?t=224901

 

[underradar92]

That's exactly what I thought. But since its not open under boost you aren't really getting the vacuum benefit when you need it.

If anyone is wondering, I called RRE and asked them... "Yes its just for emissions. If anything, getting rid of it is good for the car."

Here is a thread detailing a seemingly effective option to leaking boost into the crankcase. http://dsmtuners.com/forums/showthread.php?t=229338 IMHO, it can't hurt to pull out the blowby gasses out as much as possible, to keep the oil cleaner longer.