Head Oil Drain For 25det

[theDETlife]

Whats the deal with the 25DET motor?
are they prone to the legend of sending excess amounts of oil to the head starving the bottom end like the gtr's? (from what i gather from reading online)
Is the head oil drain mod worth it for a street driven car that gets thrashed regularly?
Just like any Rb owner i love to be on the limiter (or close to it) for as long as i can before running a bearing or blowing something else up.
In my application I have a 25det neo completely factory in my laurel which I drive some-what weekly and also dish out considerable amounts of rape
on the engine a least once a month a drift events.
Is the mod worth it? do you think it will help prolong the life of the bottom end?

[Ben C34]

Read the last 10 page s of oil control thread.

[scotty nm35]

It's not just RB's, most engine designs will flow excess oil to the head at 8k revs, and on most it won't drain back well enough to the sump. My evo is in a similar boat.

[GTRPSI]

Concentrate on equalizing between crankcase and under rocker cover pressures, point being is you want less (ideally) or the same pressure in the crank case than in the cover.

A large enough fitting running from the crank case to the rocker cover does most of the problem solving, once you stop allowing blowby to run up the engine via the oil return passages, oil can naturally find its way back down.

Most times this is solved by either running a pipe or 2 between the crank case and rocker cover or by venting the crank case straight out to a catch can.

If you want to assist the catch can in pulling out crank case pressure out of the bottom end, run its outlet or breather into the intake pipe between the air filter and turbo, its a natural vacuum producing point thats free to use.