Since I'm now boosted, and that can play hell with the stock PCV system, I'm considering scrapping the stock stuff entirely and putting a pitot tube into the exhaust stream, and hooking the valvecover vent to it. Anyone played with this?
Summit has a few kits for this. http://store.summitracing.com/partdetail.asp?autofilter=1&part=SUM-120108&N=700+4294851516+115&autoview=sku
From reading online, some people love them, some hate them.
You need an exhaust with NO backpressure for them to work effectively.
Shawn
Yeah, if you have a restrictive exhaust it won't work. I too am interested in a solution to this dilemma. I was thinking that an electric vacuum pump may be the solution, but it's low on my priority list of things to design up right now so I haven't done much beyond concepts.
my plan is to make a oil air seperator then hook it to intake pipe in front of turbo
used that system in the stock car(late model circle track) worked well, had to change the valve frequently, 3 times a season. it would really start to smoke!
Many drag racers use this system so it must work well enough, but they only need it for a few seconds at a time and they sure don't have any back pressure. A vacuum pump is a great idea and you'd probably see more benefit from that over running a tube into the exhaust.
Exhaust isn't restrictive - 3" straight pipe into a turn down. That's it.
I could do the vacuum pump, or separator, or other stuff, but it's more weight and more complexity. If it will work, I REALLY like the simplicity of this.
Warped - when you say you had to change the valve - I assume you're talking about the check valve? I was wondering if it's even necessary to run it.
I was always happy with running a vented catch can. Summit sells some plastic NHRA-legal ones for cheap (~$20?). I ran a hose from the OEM breather port on the valve cover to it and from the OEM PCV port on the cranckcase to it plus capped off the oil-sucking port on the intake. Worked like a dream in a turbo car, cheap, and you can keep track of blow-by.
The pitot idea sounds brutally simple and effective though...
P71 wrote: I was always happy with running a vented catch can. Summit sells some plastic NHRA-legal ones for cheap (~$20?). I ran a hose from the OEM breather port on the valve cover to it and from the OEM PCV port on the cranckcase to it plus capped off the oil-sucking port on the intake. Worked like a dream in a turbo car, cheap, and you can keep track of blow-by.
Same here, I stuffed it with steel wool to encourage the oil vapor to condense in the catch can. Had a drain hole with a stopcock tapped on the bottom of the catch can, would bleed off the oil periodically.
It was kinda stinky when it was venting, but it was a "race only" vehicle.
I'll be interested to see what you come up with.
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