ptuomov

If the hoses are not sized right, that setup theoretically runs the risk of the exhaust slash cut tube creating enough vacuum and the crankcase generating enough pressure to lift oil from the pan. Theoretically only, sounds like it's not happening with your setup. If it works with your setup, then it works.

Every hot rodded engine has slightly different problems and require slightly different solutions. That's why it's in my opinion very important to understand exactly what is happening with each particular engine configuration when trying to patch the 928 crankcase ventilation.

robot808

Fred, it's not really a bit of everything. It's simply an 82 with a 928MS supercharger kit. I just want to see if I can improve on one facet of it.

FredR

Bob,

I think you can and it will not take too much to achieve if you are mechanically sound. Go for a good primary separation baffle along the lines I indicated, plumb that to a pro vent separator assuming there is space to get the plumbing geometry & ensure you have a vent 1 inch diameter to the pro vent. You can consider routing the gas outlet back to the inlet wiht a similar diameter pipe and I suspect you should find that the resulting emissions will not foul anything but check carefully. On the S4 I was concerned it might foul the MAF hotwire so I route the vent pipe to the under side of the car in the hope that the air below the car might induce some kind of venturi effect to help evacuation a tad but that is probably wishful thinking. Even so I have yet to see any traces of oil coming from that vent. The oil drain connection from the pro vent I run back to a little catch bottle and so far it has caught only a few drops of oil so I reckon John Kuhn's internal baffle design works quite well and he designed that with his twin turbo system in mind. I believe Doc Brown also has an offering in this field.

If I feel I need to take this further I may try something along the lines of what Colin does with the vac pump- I suspect that is an elegant solution but a bit more pricey and more bits to wear out so you need a really good pump kit if you go that route.

robot808

Alan,
I love when you comment on my threads. Period.

Fred,
Thank you. I already have a MS baffle installed, as well as a seperator in the filler, so I'm really concentrating on the supplementing what I already have. Means finding the right catch can and a place to put the fumes. I think the Provent idea is a great one.

Hold on,
Did you have the Provent when you had your vent going back to the intake? Or had you moved away from the intake by the time you got your Provent?

Tuomo,
I really like your idea. It sounds like a factory type solution to me. May try that, but I would like to hear if Hold on had tried anything similar.
Also, good advice about understanding the system. Makes a lot of sense.
Although I know very little about this, I believe I'm capable of understanding any system. It may take me a little while, but ultimately I'll get it.
So, I'm just looking for the best idea. Even if it is a bit complex, I'll figure it out.

Carl Fausett

Bob, some how your picture looks a little different to me.

Have you tried hosing it like this:

Lizard928

And where does the brake booster connect to now then?

FredR

Bob,

I made the mistake of thinking that when I "upgraded" the breather system of my S4 motor to the GTS system it was a positive thing to do- I think we have established that was not a good thing and explains to some extent why my oil consumption incrreased. Having looked a various solutions I wanted to try something to see if I could get things under control and listened to various pieces of advice and tips etc. With hindsight I should have installed the Pro Vent and nothing else to test for impact and then gone to stage two to rty the upgraded baffle- either way I went for broke and installed the lot in one hit. for sure there has been oil consumption improvement although just how much is stlll debatable.

I did not try the Pro Vent looped into the stock system and was a bit wary about increasing the breathing capacity and then recycling back vapours that may contain oil upstream of the air filter.

Ultimately I would like a system that recycles the vapours rather than vents them directly but my programme is to improve oil consumption and then work out how make it "greener" if possible.

I still have a few more tests to do when the cooler weather returns but then I do not have to worry about the smog ***** taking me to the cleaners.

I am interested to learn how my Cayenne Turbo motor deals with this aspect. I have a feeling it may compress/recycle the vapours to permit recycle under full boost but the jury is still out on that one.

Regards

Fred

Hold On

Here is a picture of setup. Drain in bottom of ProVent goes into stock oil drain hose going back into oil pan. Vent runs down driver side of engine ,down to fitting welded to Y pipe then gets sent out the back door. No oil smell in cockpit and no oil film in intake system.

FredR

Nice clean engine bay but is that a pressure gauge I see on the fuel rail?

Suggest you ask Randy if he thinks that is a good thing!

Regards

Fred

Hold On

Yes that is a pressure guage. Most of us try to avoid Randy like the plague.

polecat702

I've run cross country and back with Hold On, more than once. His car doesn't lay a smoke screen, or really use much more fuel than my 87 or 89 did. His car is quicker though. Trust his advice, his set up works!

It's so well engineered that it still performed with a broken internal SC belt.

robot808

Carl,
Thanks for jumping in on this. No, my OC12 had no PCV valve, and had the vent line running to SC intake tube.
Looking at that spot on the spider, I've got a line to the brake booster, and one that goes to the U under the throttle body (at least I think that's where it goes).
So, I have the same question as Colin.

Hold on, that is beautiful man.

Carl Fausett

One of the prettiest installs of our kit that I've seen. Very well done. Good job.

Carl Fausett

That's what I was worried about. That line that goes under the U to the "throttle body" may be a direct path from the pressurized plenum to crankcase. If you are describing the one I am thinking about, our instructions show how to remove it and we provide a plug to cap it off.

Carl Fausett

The Wye in the line has been turned in this picture up-and-down, and the large side connected to the oil separator line to re-breath crankcase gases, and the lower part of the Wye (with the venturi in it) is connected to the brake booster per OEM. This is an L-Jet car.