Crawford AOS with FBM kit
 

So i decided to go with crawford AOS and i was doing the installation when i notice that my throttle body pipe has no port to connect to the top port of the AOS.


Is anyone running this with a fbm kit?

What can i do here?

Attachment 42488Attachment 42489

I can also hear air coming out

top port can be vented to atmosphere. just run a longer house down to bottom of engine bay.

Do i need a filter?

you should

Yes you should. Under vacuum this port is pulling air into the crankcase.

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This is what crawford told me

Safe is not the correct term Wilbert, its not like the motor will blow up from the crankcase vent being open but its just not proper. If you leave it open then you will not get a negative pressure on the crankcase which will make the piston rings not seal as well, plus you will smell the nasty burning oil smell constantly coming out of this hose.

i ment to put should for the filter sorry. falling asleep at work

I would just plug that port on the can, or if you want a hose to run to it, then just T the hose off the back of the intake manifold and run it to both ports on the can. I will stick with my vented catch can.

Just bung ur intake pipe drill it and get one of those plastic taps with rubber seals and connect the hose

I put a small autozone filter lol

There is a lot of air coming out
Wouldnt plug it be bad?

@Gen has the FBM with a Crawford AOS. He should be able to chime in.

Awesome

I had a bung welded on to the intake before the turbo. The kit really should have come this way. You don't want to plug it.

Can u show me a pic?

why not just vent it to atmosphere

I did added a filter

Car is being worked on at the moment, so I can't snap a pic until tomorrow, but in regard to venting to atmosphere, when I spoke to Crawford about this they indicated you'd lose power and it's generally not something desirable to do.

Yep they told me the same thing but i then why do D3 performance and many other has them to blow to the atmosphere

Quite honestly I don't know enough about it to answer intelligibly and defer to others that have a better understanding. From what Crawford explained, you want the crankcase to be under vacuum and you don't want oil leaking onto the road. As far as D3 goes, no idea.

They don't have any diagrams of the inside of the can so it's difficult to tell for sure how you need to connect it with a boosted application.. but i am guessing, since any oil caught is supposed to drain out the bottom port, the can has no internal separation and as a result it's not doing anything good in the current configuration.

Fairly sure the way that is plumbed right now you are sucking unmetered air into the intake manifold when off boost and blowing metered air our the when under boost. That may be part of the reason your fuel trims are all over the place.

For the time being, you should take the can out of the equation and put the system back like it was before you installed the can.

For that can to work properly it needs to be a closed system. You will need a bung pre turbo (as others have said) to connect to the port that is open. you also want a good check valve between the can and the intake manifold port so it will not pressurize the can under boost pressure. The stock pcv valve is on the block side so as soon as you go in boost the charge is filling the can and running out the open port and back into the block on the connected intake side port.

I honestly think you would be better off with 2 separate 2 port cans and a couple of crankvents (http://www.et-performance.com/automotive.html)... the idea draining the caught nasty back into the oil system is.. well... nasty.

Will take it off tonight and will go with d3 performance one

They have also blown motors and had their car performing poorly in two videos now, so I don't know that I would take my advice from them. Venting to atmosphere definitely won't hurt your car. If you plug that extra port then the vacuum from the back of the intake manifold should still pull on both the PCV and the front port.

Until someone shows me gains when pulling vacuum on the crankcase, then I will stick with vented. I don't want that oily air going through my engine.

So having a filter is ok?

Fair enough--last I heard, they were up to 4.

4 engines??? Holy shit

Because you have the vacuum line connected off the back of the manifold a filter is NOT ok. You either run it as a closed system or you run it as a vented system. The best solution to run the can as intended is to T off the vacuum line on the back of the intake manifold and run it to both of the ports on the can. Just remember that once you accelerate and hit boost there is no longer any vaccum being created to pull out the oily gasses so essentially the can becomes pressureized at that point. With a vented can it never sees vacuum or boost so it performs the same all the time.

I know you and I are on opposite side of the fence about open vs closed systems.. but I think we both agree that the way he currently has this plumbed is creating both a vacum leak and a boost leak since he has the port on the intake manifold connected right?

Just what the local shops are reporting, but who knows, really. A lot of stuff goes on that never makes it on this forum, but don't take it as gospel.

We are in agreement.

we always vent to atmosphere without a problem

This is wrong I tested mine by pressuring it. the top and bottom are separate.

Gregg

Top and bottom what? Ports on the can?


EDIT: Maybe the can is actually completely divided inside making 2 independent paths with no cross over (I think that is what your saying right?), in which case oil would drain back via the pcv valve and the port under the AC compressor.

Personally, i would rather pay more for 2 independent cans that do not put the captured oil back into the system, but that topic has been beat to death already.

Yes it is separate. This allows for both bottom ports to drain back into the block. These things work and they work well.

Hey King Tut, did you ever see those gains or still running V2A?

There are no gains. I sold the car with the V2A, and I have a V2A on my turbo S2000 now.

I have been running vent to atmosphere on a custom separator for over a year. Yes it smells and requires the maintenance of draining the can but that's a compromise I'll make. I want to keep my pistons clean and that crud out of the motor. There are way to many big power builds with VTA cans for it be a detriment to power.

Boom, resurrection!

I guess I am missing something. I dont understand why the top port of the intake manifold would be used here if you are boosted. Wont you be boosting the catch can here? I dont see a check valve. Would plugging that port on the intake manifold and running the AOS line to a port pre turbo be a better solution?