proxlamus© Posted March 2, 2006 Share Posted March 2, 2006 I got bored today, and decided to make a PCV evacuation system... similar to the stock setup I didn't want to drill and tap a hole in the intake manifold, so I did it the easy, cheap and effective way.. With the turbo, and N42 intake manifold, the PCV valve hits the turbo outlet, so I had to plug it up with a large bolt.. soo I put a filter on the end of the crank tube... since the oil and gas blow by blows OUT of the crankcase/block the filter would become clogged, and when this happened, strange things would occur.. the clogged blow by, caused sooo much high pressure build up in the crankcase/block, the turbocharger oil drain would not even drain the oil, because the high pressure was keeping the oil in the line. This would result in the oil to leak out of the turbo seals, and drip into the exhuast, which would smoke really really really bad. I then ran it open with no filter or anything, but I feared on a dirty or wet condition, water would enter the crankcase and contaminate the oil. SOO.. I attached clear hose from Home Depot to the crankcase PCV outlet, and put the open end behind the brake master cylinder and brake heat shield so no dirt would enter it Well.. with the PCV and nasty blowby gases pointed at the firewall, and the old rubber grommets I had, when I rolled the window down the high pressure in the engine bay would flow into the cockpit/cabin and create a vacuum.. ****, now I am smelling all this nasty *** blow by... I decided to buy the largest PCV valve I could at Checker Auto Parts, and attached a 3/8" hose to the intake manifold... obviously since it's smoothed and cleaned up, I TEE'd off the blow off valve vacuum source, and voila!! Magic! I noticed the engine seems to run a weeee bit smoother, and the RPMS are steadier... (the vacuum creates a better seal between the pistons rings and crankcase) here are the pics Notice the tube from under the intake manifold to the crankcase hole, and the shiney silver filter?? well that didnt work well NOW here is my ghetto setup Quote Link to comment Share on other sites More sharing options...
DemonZ Posted March 2, 2006 Share Posted March 2, 2006 looks good to me. Did the arrangement for venting the valve cover change? Optimally, what's the best way to plumb this? BTW, lol. nice vid. I love it when it snows!!! Quote Link to comment Share on other sites More sharing options...
Tony D Posted March 2, 2006 Share Posted March 2, 2006 Have you done a cylinder leakdown or compression test? The stock setup like you have, drawing through a .080" to as small as a .063" orifice in the lower block hole should give you MORE than enough evacuation at idle, and going down the road, off-boost. Additionally, when you drop throttle from on-boost, the spike in manifold vacuum will be limited in it's application to the crankcase---thereby greatly reducing oil mist carryover to the intake manifold. Generally restricting the PCV is done if you are track racing and on-off-on the throttle. The stock system works fine, but if anything goes kaput (like ring lands) and you start blowing by, you can flood the intake in short order and detonate to DEATH instead of simply ruining a ring set and a piston or two (it becomes six if that happens!) If you have crankcase pressure, check your rings! It should easily evacuate through the orifices mentioned at idle, or any condition of the engine's operation---even with a lopey high-overlap cam with only 9" of intake manifold vacuum at idle (yeah, been there, done that!) Just a suggestion, excess pressure makes me leery! Quote Link to comment Share on other sites More sharing options...
proxlamus© Posted March 2, 2006 Author Share Posted March 2, 2006 I did... 130 130 125 130 125 125 soo my rings are obviously worn.. evenly which is good... and i'm at 5,600 ft so the compression will differ slightly.. and I used a cheap $10 compression guage.. so it could possibly be 140ish across the board and this was dry.. not a leak down test or by adding oil Quote Link to comment Share on other sites More sharing options...
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