So I'm looking at Crawford's design and it looks like the inner catch can has to fill up and 'overflow' first before the oil starts draining back into the car. I can't see any little holes in the bottom of the inner can. interesting....imagine the type of crap that stuff would be as it has to sit in that inner can for some time.
The top vent is the vent that goes back to the intake so there shouldn't be much oil in there, plus theres a small drain hole in the bottom of the inner container. The PCV and Heads feed the larger can.
Yup, looking at it, that second can is kind of a second line of defense in case any oil makes it past the initial area.
Think we have found a combination that works. Needs some further testing but initial results seem good even under 25 psi pulls.
We will wait and see how it is working over the next little while. Going out to do some work on the road with it today.
I hope someone finds a system that works. I'm running my Crawford aos venting to the atmoshpere and the smell SUCKS when at idle or driving slowly. If I plumb into the intake, it stops nothing. I want a closed system that actually works like it's supposed to. Hopefully it won't cast an arm and 2 legs.
I'm just not sure plumbing it back into the intake is a good idea for a big power car. The question that I really want answered is how much oil is really making it back into the intake and how much is it lowering the octane rating of the fuel. If its lowering it a significant amount then thats not ok.
I have yet to see an AOS that filers out every little bit of oil mist. I am not sure one exists. I would not plumb it back in personally. But, that being said, the combination we have currently on Ben's car seems to be doing ok so far with no cabin smells But I want to continue monitoring it for a while to see if it continues to go well. We beat on it on several pulls today with no real collected amount in the AOS or in the output line. Intake is of course still absolutely clean as nothing is getting recirculated back into it, lol.
Mine will absolutely soak the inside of the inlet pipe if I plumb it back. Now I have a line running from the top of the Crawford can to a NOS energy drink bottle and there is a few drops in there from about a years worth of use. That tells me that the AOS doesn't work when plumbed like intended. I've always thought that there is a conflict of interest by having the block line on the plumbing being a supply and return line. Seems to me that they would work against each other and not allow for the best oil return. It would have been better to run the return line into the turbo oil return line. At least it makes sense to me. I don't claim to be the smartest guy...:keke:
When I had Drews car on the dyno it knocked twice at a timing level that it shouldn't have been knocking at. I pulled the AOS line off the intake and all of the sudden it stopped having that problem. That was enough proof for me.
My 35r pulled so much oil thru the can at 28psi that oil was dripping from the intake filter. It was rediculous. What a mess in the intake pipe and FMIC. No problems since after I vent to the atmosphere. The smell just SUCKS!
The oil return line is effectively a port in the crankcase just like the one on top of the motor. Me personally, I would not want to interrupt the flow of oil back from the turbo. They can be touchy as it is. Good thought though! If there is any pressure in the system, it will work against the oil flowing back into the crank case, but that should only be happening on prolonged full throttle pulls. If the oil separator is large enough, it should be able to hold the oil until the pressure subsides and then drain back.
LS1 smog pump is installed and plumbed in the car. Wiring in a Hobb switch this week. I'll get Doug to test this thing on the dyno. I just need to find a place to mount my catch can. Any ideas?
Well there's the AOS then it plumbs into a catch can then the pump. So it'll take a bit to get that far.
We'll see.....I don't have much money in it. $10 in the pump and friend has a Hobb switch I can borrow to confirm before buying one. Pump sounds like a jet engine...lol.
Yeah was looking at the BMW ones as from what I have heard, they tend to be more tolerant of oil mist. But if your setup works, hopefully you will catch most of that.
Oh as a FYI, the guys I have talked to running these still see some pressure at full tilt. Might want to install a pop off valve somewhere else or a one way check valve or something.
What you mean? If they are seeing pressure it'll just blow out. The pump isn't routed to anything and blows out to atmosphere. I don't understand why you think I need a check valve.
you just want to vent the crankcase, you don't want to let outside air / moisture back into the system. The check valve will prevent the crankcase from pulling this back inside when the case is under negative pressure. Mike, was it you who was talking about a mini-style BOV w/ a low low spring in it? Can't remember where I heard that, but it sounds good in theory...opens up under any pressure, but closes itself when none is present
I just want to put in a big thanks to everyone that contributed and discussed this matter (goixiz, Mike, nicad, Eddie, Drew, Doug, etc). Maybe this weekend I'll get some better concrete info. FYI I haven't smelled the first hint of stinky CC air so far.
Ya, the guy that was running it was running it in conjunction with an electronic vacuum pump. He said that with 30 psi, he was seeing some crank case pressure building even with the vac pump going full tilt, so he installed a small pop off valve that opened at like .5 psi. I guess it is more like a check valve with a seriously weak spring in it.
Where did he install said valve? If pressure is building up it would go into the IXIZ AOS. The drain side will plug up via the check valve in the IXIZ drain line. Rest of the pressure will simply go out via the inlet hose which is aided by the vac pump and vents out to atmosphere.
So if I am visualizing in my head right (scary eh?), the check valve in the IXIZ is essentially doing the same thing. Well I dunno I can see now how not really. Since Drew and Eddie both are doing the same thing I am doing now I don't think I'll have an issue. Drew and Eddie how much max boost are you seeing now?
Nope the check valve in the IXIZ is not doing what I am describing. But I am sure yours will work just fine.
24-25 psi, but I've spiked 28ish (not on purpose). My boost cut is set at 25, but i onoly hit boost cut when it was about 10 degrees outside and before ball tweaked the temp tables
just with building crank case pressure. That's why we unhooked the intake line and dropped it in a coke bottle.
Still squirting oil out into the coke bottle or has that improved? I guess you could say your check valve is your oil dip stick, lol.
ha - we never really had issues with oil making it that far. When I pulled off all of the IC piping this past weekend there was hardly any oil in the inlet
Just crank case pressure huh? Well we have Ben's Valve cover vents going through a Moroso AOS then venting. The crank case vent we have going through a breather then venting. So far it seems to be working ok...we'll see how it goes over then next couple hundred miles. Since eliminating pressure, there seems to be very little oil. The only thing I want to change at this point is to relocate the AOS to a little higher mounting location. Eventually we want to do some more experimenting with the exhaust evac. But for now this seems to be working ok.
breath·er n. 1. One that breathes, especially in a specified manner: a shallow breather. 2. Informal A short rest period: took a breather after skiing for two hours. 3. Informal An activity, such as strenuous exercise, that causes difficult breathing. 4. A small vent allowing the passage of gas or liquid to or from an enclosed area.
What I was trying to say is you a venting via a breather right? Basically a filter on the top of the crankcase vent? For some reason I was envisioning a line, breather, then another line connected to nothing....LOL. I know I know.....
You ever seen the little push in breathers that V8 valve covers have? That is effectively what we are running on the crank case vent. The two valve cover vents are going to the AOS then that is venting, also with a filter.