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Circuit usage, on an RB25DET, same happened when I ran an RB26DETT. The emissions *rap is removed, so the intake isn't breathing crankcase fumes. The 2 cam cover stubs vent to a catch can. The valved breather that normally goes to intake plenum is blanked off. I run the oil about 1/8 inch over the full mark to help prevent surge. The oil loss is quite high, over a 20 minute on circuit session, on race rubber I lose about 1 litre or so of oil to the catch tank. The engine is perfect, no blow by, and has a Tomei oil gallery restrictor fitted in the gallery up to the head. I believe this is a common issue on race RB engines. I was thinking of making a shallow catch can to go OVER the plug cover area, between the cams, and either allow excess oil to drain back down into the breather stubs, or down a flexible tube into the dip stick tube (without the dipstick in it... :ban:)

What have others done to address this excess oil in the top end of the engine? Thanks.

thats a pretty good idea you got there. you need to rember to still have that catch can venting as it releases excess crank case pressure from what i have been told.

my sky is non turbo but i have disconected those oil lines and it does run heaps better. im also not running a catch can at the moment. just a couple of little filters to catch the oil. but i will get a catch can when the new motor is in.

tried looking into running an external oil drain at the back of the head, seems that rb's suffer from poor oil drainage and i believe it.

when i looked at my rb20's head its amazing how any oil gets back into the sump as the oil return passages are blocked by the head studs.

when i used to race holden v8s at speedway we used to tap into the side of the heads near the rear and run a drain back to the sump otherwise the rocker covers used to fill up with oil and pee out everywhere this used to fix that prob

chhers mid life crisis

tried looking into running an external oil drain at the back of the head, seems that rb's suffer from poor oil drainage and i believe it.

when i looked at my rb20's head its amazing how any oil gets back into the sump as the oil return passages are blocked by the head studs.

Who has done this mod before?, and are there any pics of it?, curious to see what it looks like..

as for the breathing problem, im about to construct a breather setup for my 26 that will have both the cam cover lines venting into a box that will have a baffle plate setup to allow the oil and air to seperate, venting the air to atmosphere through a filter, but also running a return line from the bottom of the catch can back to the sump..

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