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Passenger side Rocker vent hose with TEE fitting, 3/8" chinese "breather/filter"
Is it possible that under BOOST conditions, ( 175kPa) the maniofld pressure pushes BACK through PCV in driver's side rocker cover, overpressure crankcase ?
After a good romp, with 4 or 5 seconds in BOOST, close throttle and I get a YUGE oil smoke cloud out the exhaust: Oil cloud like a worn out 62 Dodge Dart.
Think I need more venting, maybe a TEE fitting, check valve and another breather on the drivers side PCV hose ?
Tee before or AFTER Pcv valve ?
Turbo is near cherry new, install only 3 weeks ago, 100 miles on road, dozen heat cycles, probably have a grand total of 200 seconds in actual BOOST.
1/2 inch Turbo drain hose, angled steeply DOWN all the way to 1/2" npt front of oilpan. Test with tranny fluid funnel shows I can POUR diesel+ATF mixture through the drain hose, will pass 2 gallons in 30 seconds easily.
Looking for recommendations.
Possible that my compressor seals are bad out of box ?
Last edited by Full Power; Jul 3, 2024 at 07:43 PM.
Reason: space
I had the exact same problem, I ran a line from the DS PCV to an oil separator (cheap one) to a check valve, then to manifold, cured problem. Boost is prob. creating pressure in the crankcase, creating problems. I just plugged the PS VC tubes, used a filtered oil cap. I always use an oil sep. if using a PCV valve, you would be surprised how much oil it sucks in the engine.
Thank you Greg.
I need to fabricate a big catch can for drivers (PCV ) side.
Probably try to fit some hose barbs to a quart size STIHL gasoline can, use the metal screw cap at bottm for a drain.
Maybe I can solder some little copper tube stubs to the steel can.
My ( 2003 ) 5.3 liter has a genuine, old style spring loaded PCV valve. I was surprised by that, Had thought they'd all gone fixed orifice long ago.
Seems like the spring loaded unit would ALSO function as a check valve, effectively blocking manifold pressure from flowing INTO the rocker cover.
Could maybe try to fit a grommet into catch can, mount the PCV valve direct push-in to catch can, then second fat (1/2") hose from can to rocker cover, small breather/filter on top of can.
It's been a year: Thought I'd better post up my crankcase venting solution.
Drivers side rocker cover is the older (2003) style with BIG open port at back, factory equipped with an actual-RATTLE type- PCV valve. Remove valve, remove grommet, insert 3/4" ID heater hose, 5 feet long; fits tight in rocker cover port. Route hose UP, over brake master cylinder, back DOWN and secure OPEN end of hose hangs one inch below frame rail.
The old timers called that a Road Draft Tube, and it worked well for 80 years of happy motoring, until California ruined it for everyone.
. Passenger side: 3/8 hose from stock rocker cover hose barb 16 inches long to a cheap chinese K&N push on "filter" hangs out just below Turb0- mounted conical Air Filter.
GROK has calculated free air slipstream induced "road draft" crankcase ventilation volume at 60 miles per hour to be a bit more than twice that of the stock closed PCV system.
Compoared to the later .070" Fixed orifice used from 2004 on, we probably have three times the Crankcase ventilaton at cruise speed than factory, and asuredly PLENTY of flow for BOOST conditions- Near Zero crank case pressure-
So far, zero oil consumption, ZERO exhaust smoke under boost, or at let off. Oil stays clean. A few times in winter, I'd see a tiny drip of condensed moisture hang on bottom of open 3/4" hose. Never seen any hint of oil, and never had a visible drip, nor spot on the ground under the Road Draft Hose,
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.drivers side, 3/4" id
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passenger side 3/8"
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Last edited by Full Power; Today at 01:34 PM.
Reason: pic
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Crankase venting vs PCV "valve" vs BOOST 
