My contribution and permanent cures
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Like all I got pi*ssed off with this problem not long after installing a 5.0 in my Oz 4Runner in 1993 and gave thought on how to cure it permanently or at least so I didn't have to constantly check oil levels etc on long runs.
I assume most know that when you fire up, the sump and valley etc are basically smothered in a fine oil mist from the crank flogging the oil etc, ie you can't see through it. So the valley area is covered in a fine oil mist which gets sucked up the pcv etc.
I figured the only way to eliminate most of this was via an extra baffle system.
This is the system I fitted to my GT40 stock manifold. The pcv entry section at the rear of the manifold is completely blocked off by a piece of this steel plate shaped to fit and its also welded to the larger plate. There are 3 small boss extensions in the manifold that can be drilled and tapped for bolts.
I then welded a piece of 1/2" tube to the flat plate section and also into the now sealed pcv entry. The tube ends about where the bolt is at the front of the engine.
Cured the excess oil problem for good
I now have a 8 trumpet manifold setup that I fabbed up and I had to locate the pcv in the center of the lower manifold section. Upon testing this new setup I later found the upper airbox was literally covered in oil, so again I decided to use my old system but go a step further.
Using the two bolts that hold the lifter clamp down in the valley I mounted a piece of alloy as per this pic.
I then fabbed a full baffle system. The outside edges are cut to follow the head contours and silasticed to the head just under the intake ports. This also stops oil from contaminating the intake gaskets
The air enters at the front via the hole that is just visable and also via the small slot section at the rear. Also the underside of the manifold itself has a sneaky cover over the pcv entrance that has a series of small holes drilled on the sides (not underneath). This cover also has additional wire separators inside. I will take a pic later as I do plan to remove the lower soon for other reasons.
My new upper maifold is now dry as a bone and it sucks hard when idling even with the E303
JD