docmirror

My understanding of the GTS breather kit is that it vents both cam covers, nothing to do with getting the oil vapor out of the intake stream. I think it's a good idea to vent that side too, but I'm interested in not returning all the oil vapor to the intake. For that, we'll need some kind of draft tube, with an oil recirc setup.

the ProVent seems to be pretty well setup. I'd like to know if anyone has installed one, and if so, have they looked at the intake to see if the problem is reduced, or gone?

I'm not into spending money on an untested fix. I can just dump the crankcase gases overboard, but certainly the oil consumptioin will go up a bit, and some part of the car is going to get a bit dirtier.

David L. Lutz

Thanks for clarifying that makes sense. I have so many items I am refurbing with the engine out and I am trying to make as many improvements as I can.

I will keep an eye on this thread as I too would like to clean up the vapor going into the intake.

Thanks Doc

RyanPerrella

here is a site on the ProVent, maybe a good read

http://www.republicsales.com/MANN/Provent_Brochure.pdf

docmirror

Finding sales literature isn't hard. Finding someone that actually used it, and it worked to decrease oil vapor is different. and for the 928 is even harder. Maybe I'll have to be the guinea pig.

heinrich

Not vapor, oil period.

Tom. M

I've been running the provent for about 3 years now. I have the stock cam vent hose/oil breather lines under intake except I blocked the port where it enters the rubber elbow under the maf and connected those two (at the y) together. I then used Louie Ott oil fill breather cap (borrowed from Adam B for the time being) plumbed into a 1" hose..routed up front over top of rad..and down into the provent which sits in front of the Rad. I don't have any A/C condenser up there so I have lots of room. Basically all my venting exits the oil fill and goes through the provent... I'll see if I can dig up some pics of the setup..or you can find the Sharktoberfest pics of the Rear Turbo car...should be an engine shot there somewhere..

here's the pic...doesn't show the actual vent but the main hose from oil fill...the vent sits right in front of the rad at the end of the hose.

John Veninger

Cool, so no oil vapor just pure oil

Shane

My breather lines go to a Provent. No Oil or oil vapors in my intake...

heinrich

Nothing personal. There is a massive oil ingestion issue with 928's .... normally it doesn't cause problems but this residue can be found not only in intake ports, but throughout the entire intake system all the way from the cam cover to the throttle body (have you seen oil pooled there?) to the intake and the intake ports.

heinrich

Tom, do you find oil in the provent?

89 928 turbo

We are setting up to do some real time testing on my car in the next couple of weeks. The focus has been to minimize crank pressures under boost but also to deal with the oil vapor issue. Some version of this exists for cars under any method of forced induction. I would be interested to hear any SC numbers that have been measured under various levels of boost on crank pressures.

We expect to sort out Chucks TPS issue this week and get it back on the dyno...part of those tuning runs will include doing some measurement of crank pressure under boost (5lbs) and see what that says.

We'll do the same on my car at 10-12lbs and see what that says.....I currently have vented all four openings on the valve covers and routed them into a custom aluminum version of what Tom has on his car....and then ran a separate vent off the oil filler cap assembly as well to a different pot....to see if it makes any difference on where it is coming from, if it is oil or vapor.....after 3+ months, there is nothing showing on the guage for volume, but I expect there will be some from vapor......I don't think Tom found much, if any oil accumulation in the provent...

89 928 turbo

One other comment now that I think about this for another 10 seconds....in one of our first plumbing arrangements, we ran the hoses from the valve covers down both sides to the front and used aftermarket valve cover filter vents (chrome, 2 3/4" high flow) and stuck them right inside the holes where the old air flow plastic sleeves were....it actually worked pretty good, but there was a persistant accumulation of oil dripping under the passenger side of the car, but not so much on the driver's side....at that time we also did not have any crank venting from the oil filler. Anyway, don't know that I can suggest why it was more predominant on the P side of the car, but it was..... (5-8lbs boost).....

JT

Tom. M

I think it has to do with with crank whipping the oil up preferentially on the passenger side and it blowing out those holes. As to the question of oil in the provent...I had a little when I was under the influence of boost (only a small amount collecting in the drain hose..not in the provent). Now normally aspirated there is non that is noticeable.

I did notice that when I was boosted, that the rad would collect dirt where the provent exhaust was located suggesting oil vapor..but now back to stock there is no more collection...

I think Louie doesn't even use a provent on his blue S4..he vents from the oil filler cap and plumbs directly into the bottom of the "former" air pump filter right in the center of the rad.. clean and easy...

PorKen

Shoot, I forgot about that. Clever idea. I was going to try that with my early metal filter box.

cfc928gt

I just pulled the intake on my '89 GT to fix a vacuum leak and I'm a bit stunned at how much oil/carbon build-up there is at the end of the intake runners. Since the oil breather comes in at the throttle body why is it that the runners are all clean until the last 3 or 4 inches before the head? Would Carl's oil control baffle help at all on an '89 or is this all a result of oil vapor? Thanks