Bluemule, I think that moroso kit is the exact kit that i have installed on a race car, mind you this was back in highschool when i didnt really understand what it was for. I still do not fully understand why i couldnt install that about a foot after my turbo or so? why wouldnt there be enough negative pressure, and here i was concerned there might be too much. And no im on the other coast, Vancouver Island.
So lets get this straight, the oil into the intake doesnt hurt anything as long as i have no EGR which i do not, however the oil also is not neccessary and it wouldnt hurt anything to not have it there, but it would be best to recycle it into the crankcase for oil consumption purposes.
Thanks for the response guys this is getting alot more interest than i expected.
TD, the question revolves around high pressure waves/pulses. Every high pressure pulse has a low pressure area behind it, even high pressure waves from nuclear bombs. So what happens is a high pressure wave, namely the exhaust pulse, passes by the pipe that is welded to the collector, and of course it is welded on an angle, the check valve ensures that the high pressure does not go back up into the engine.
Now as soon as the high pressure pulse passes you have the low pressure area behind it. What happens now is that the atmospheric pressure in the crank case is greater than the low pressure behind the pulse, this pushes the check valve open and some of vapors go into the collector and then the check valve closes till the next cycle.
Obviously the closer the wave to the angled pipe the more effect there will be, so the header pipes that are closer to the angled pipe will “flow” more than those father away.
So how does this affect us, well because of the nature of a turbo manifold and the turbo itself we have some difficult physics to overcome. So let’s start at the back and work forward. Putting the “angled tube” in the down pipe will not work because there really are no “strong” pressure waves. The turbine homogenizes all of the individual pulses that would normally be found in a header collector, that’s why a turbo engine without a muffler sounds so much different than a non turbo engine with an open header. Also putting the “angled tube” in the area that one could call the “collector” right before the turbine inlet won’t work because the turbine has a certain restrictive effect on the exhaust, which again, kind of homogenizes the pulses, so you do not get a clean pulse in this area either.
The only solution for this is to install four “angled tubes” one at each exhaust port, either in the head or into the exhaust manifold, the reason I stated the there really was no viable option for this in the VW TD, is that drilling the exhaust manifold, properly placing the tubes, etc. is, IMHO a lot of work and $$$$$ for the gains you would see. In the ‘80s both Mercedes and GM used this type of solution to add air from an air pump to the exhaust stream to get the catalyst to Fire Off when the vehicle was cold. It can be done but since you don’t want to break the budget…….
If you wish to filter out some of the oil mist, you can make or buy an oil recovery tank with some baffles, hook one side to the baffle thing on the top of the valve cover and the other end to the inlet side of the turbo, this should filter out the majority of oil. Or you could go the cheapest route and leave it stock.
Wow this looks like a Phd dissertation, so I am done.
