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[5thgenlx]

originally posted by fook, may 21, 05

From boredom and experimentation, along with some ideas from d-series.org on bi-directional pcv systems like what you see on factory turbo cars, I decided to make my own.

I did everything from HomeDepot Parts.  Probably spent $30 including a catch can I incorporated into it.

The parts list:

Husky Air Compressor Filter w/ 3/8" NPT threads (air/water separator)
10' spool of 3/8" ID 5/8" OD Vinyl Hose
10 hose clamps to fit 3/8" hose
3/8" barbed T fitting
Two 3/8" NPT to 3/8" Barb fittings
Two 1/2" to 3/8" adapters (I used a gutted pcv valve for one of these, and a plastic piece I found at homedepot for the other, it was a last minute grab I almost forgot about)
2" piece of 1/2" Hose
2 stock honda PCV Valves (holy shit theres one right there on your intake manifold!)
3/8" Barb to connect to your intake tube (your choice how to do this, I didn't do it cause I dont have a filter or anything)

Here's How to do it:

Step 1: put the 3/8" NPT to barb fittings into the husky filter.

Step 2: remove the stock PCV Valve and hose that runs to the Intake Manifold.

Step 3: Mount the Husky Filter (catchcan) in desired location.  I chose right behind the intake on the firewall.

Step 4: using a 1/2" to 3/8" adapter and hose clamps, connect the 'IN' side of the catchcan to the stock PCV valve location using some of your 3/8" hose.  This connects your catchcan to your breather box, without having to get under the car.

Revision:  Tho pictured here is a filter on the valve cover breather, its not a bad idea to T it into the line between the crankcase and the catchcan so taht the head is being ventilated as well, this however can be skipped without problems if you wish.

Step 5: Using a short piece of 3/8" hose and of course more clamps, connect the 'OUT' side of the catchcan to the 3/8" T Fitting.

Step 6: Continuing to the other side of the T fitting, using another short piece of 3/8" hose, connect the other 1/2" to 3/8"  adapter to the T fitting.

Step 7: Use the short piece of 1/2" hose you have to connect the stock Honda PCV Valve to the 1/2"-3/8" adapter that you just attached to the T fitting.

Note: This is a good time to replace the PCV Valve, they're cheap, and its piece of mind, so do it.

Also, if you can find a pcv valve or check valve that has 3/8" barbs on both ends, you can skip the adapter and connect the pcv directly to the T fitting with 3/8" Hose.  I personally could not find one in stock anywhere in town, but if you can get hold of a 1991 Saab 9000 Turbo PCV Valve, I believe it has what you need.

Step 8:  Connect the 1/2" side of the PCV Valve to the normal port on the intake manifold where it normally connected before we started.

At this point you're almost done.  There is one open fitting left now, and that is the third barb on the T fitting.

Step 9: Connect a 3/8" barb fitting to the tube between your turbo and the filter on the inlet side.  Run a hose from that barb up to the open barb on the T-fitting.


Revision: although not pictured here, somewhere on the line running from the T to the turbo inlet, you should have another PCV valve installed that is reversed in direction.  That way when out of boost that line will be sucked closed by the intake vacuum and you will only be pulling air from the crankcase.

Note: On my car I do not run a filter or tube off the inlet, so I dont have a place to connect this hose.  However, having it just open vented should still at least let the crankcase breathe without restriction under boost.  I ran mine in front of the radiator and pointed it back toward the rear of the car.  Maybe the fan will provide some suction, lol

Step 10: You are done, make sure the port on the bottom of your catchcan is closed, and go rip some panties.  Just make sure to do it at 100% throttle, not 66% like hotrex does ( pussy :p )

What you have just created is a pcv system with two paths.  One one path the normal pcv valve will provide vacuum until you boost, at which time it will close.  On the other path, when the PCV closes in boost, the suction from the turbo inlet pipe will provide vacuum to pull vapors from the crankcase.  The end result is constant crankcase ventilation.  There is concern that sucking on the crankcase vapors from the turbo inlet would suck shitty oil gunk into the  turbo and then you'd be burning oil, but thats what the catchcan is for.  The catchcan location was chosen so that it was filtering the vapors before ventilating to either path 1 or path 2.

Here are pictures of the system installed.  Note I did this in about 1 hour, stopped to eat, and have not yet mounted anything properly.  This was just to get it in the car and on its way.