im looking for insight on a catch can set up for high hp miata's(400hp +)
specificly i want to know if i can remove the pcv valve and run a 10an line to my catch can. and two 10an line off the exhaust side of the valve cover.
does any one on here run something like this??

 

this has always been my plan...





betcha less than 10% of the members here even have one or thought of one.....

 

if you have a catch can / filter / something to remove the oil mist, what's wrong with having it go back to the intake?

ps drft in username.

 

mine is for pressure alone, making sure the oil doesn't cover the engine bay is French benefit...

 

yes the less pressure in the crank case the easyer the pistons move= more power,my boss's big block runs a vaccume pump,he picked up like 20 crank hp on our superflow engine dyno. and with high hp cars you dont want to run back into intake, turns every thing black and nasty, turbo cars blow out alot of oil mist.my car is gonna be pushing 400hp, it is a purpose built race car, built to formula d specs. the drft in my name is cause i drift, i live in ct and my car is a na. my big question is will i have any negitive effects of removing the pcv valve and just venting that to the catch can.

 

my setup would be indentical to what you posted exept i would have another line coming out of the driver side of the valve cover.

 

Haven't seen that on any Miatas- but no reason why it can't be done. Most higher boost applications I've seen eliminate the pvc just because it becomes more difficult to prevent the valve from leaking. And most of those cars are daily driven so the pcv valve serves less benefit. IMO a turbo'd daily drive benefits from both a good vent system under boost and a good pcv under normal driving.

I've never heard of drifting, but it sounds like fun.

 

but under power you wont have anything "sucking" from the crank case.

and it's "fringe". unless the french like to smear things with oil.

 

Y8S, true, but the gasses will take the path of least resistance, so if he drills out the openings he will be ok, not?

 

^^^ That's how I did mine, I'll post pics if I can find them.

EDIT:

 

there's like what....1 ~hg. in the intake? I'm sure two large *** 1/2"npt bungs to atmosphere would be better venting....

 

all that check valve is doing is keeping presure from the intake manifold from blowing into the valve cover right, so if you remove the hose from the manifold and run it to the catch can there is no pressure and still a vent

 

i dunno, haven't measured it. but after the filter there's an assload of air going in to the engine. enough to suck all sorts of crap in.

 

Technically with boost on the intake manifold the PCV valve should be shut iirc, so how you gonna suck out anything unless you reroute the PCV to the inlet of the turbocharger?

The turbo 2.3 Ford cars back in the 80s had a breather on the valve cover that would suck into the turbochargers inlet.. My guess was for this very reason, but they could've been thinking more along emissions than anything else.

 

that's exactly like i'm talking about. like most factory turbo pcv applications... pre turbo suckage.