armen505

iTrader: (3)

Alright guys,

So I just ordered a catch can and was wondering what the proper way to install it in an S5 N/A is. I know that one hose goes to the oil filler neck but don't know about the other. Also what do I do with the stock PCV valve and hose? Any help and or pictures would be much appreciated. Thanks fellas!!

RockLobster

iTrader: (7)

Why did you buy one? I have never had any need to install one on any N/A car i have owned. The stock PCV valve and charcoal canister work great (with a baffled oil pan for track driving).

armen505

iTrader: (3)

I know that these are mainly used for turbo cars but for $18.90 it can't hurt to have one. Plus I'm doing it becuase I've heard it keeps the engine bay clean.

I've searched alot and every post keeps talking about a second nipple on the engine block to attatch the second hose to, but my motor doesn't have that second one, or at least its not visible.
Would really appreciate some help on hose routing and location.

arghx

iTrader: (3)

I don't even know off the top of my head whether the s5 n/a irons have a nipple on the block. but if they don't, you can run a hose and a T to the oil filler.

One side goes to the oil filler.
One side goes to the intake manifold with a PCV valve (autozone or whatever) in-line
One side would join up with the charcoal canister and route like stock (should be a check valve).

I've never run a charcoal canister on an s5 n/a before so I can't give real specific details without having the car in front of me.

armen505

iTrader: (3)

Using a "T" to tap into the hose with the stock PCV valve on the filler neck sounds like a good idea. I was actually podering that idea as I was trying to fall asleep yesterday.....As far as the other side that joins with the intake manifold goes I think I would have to get a little creative and a find a suitable hose to tap into as well unless someone else chimes in with an exact source.....

I know that if I don't do this right it will act as a vacuum leak, so I really wan't to make sure I get it right, otherwise I won't do it at all.


Thanks for the input Arghx!!

arghx

iTrader: (3)

Here is how the 93-94 FD does it from the factory. There is only one main breather port, which is on the oil filler. Then the hose goes to a T where it splits off to the intake manifold/PCV and back to the intake. Instead of running to the intake you would run the hose to the catch can. The catch can could be vented to atmosphere. Whatever PCV valve you use should be oriented such that air can only flow into the manifold.

Note that the crankcase ventilation and evaporative emissions systems are completely separate on the FD. The FD has a duty-controlled solenoid valve which controls flow from the charcoal canister.

armen505

iTrader: (3)

Ok, so from what I understand, I "T" off the hose that goes from the stock PCV valve to the oil filler neck and connect one hose from the catch can there.........Then I use the other opening on the catch can as a breather vented to the atmosphere........Does this sound about right Arghx?

BTW I found the other line you were talking about, the one that comes from the carcoal canister, and it does connect to the top of the center iron from what I can see. But given this new info, I'm not sure that I need to fool with that at all. What do you think?

jjcobm

iTrader: (18)

I retained my stock PCV system and emissions and just added the catch-can IN LINE with the PCV system. I would have to double check but if I remember right it is in between the PCV valve and the oil filler nipple. My catch can only has 1 inlet and 1 outlet. Pretty self explanatory.

I have also ran with full emissions removed and just a catch-can. I wouldn't recommend it since the stock system does a great job of circulating air through the "crankcase (oil pan)" which you wouldn't have (unless done properly) on an emissions removed engine.

armen505

iTrader: (3)

Here's a pic of an engine bay that I found online. It has a few lines missing but it should give a general idea of what I am working with.

armen505

iTrader: (3)

JJcobm, so you had one hose from PCV and one from the filler neck, directly into the catch can?
That makes sense!! Was it functional?

jjcobm

iTrader: (18)

Yes.

Funny story, I had a good time trying to figure out a way to hook the catch-can. When I re-installed all the emissions equipment retaining the PCV was something I wanted since it draws fresh air into the crankcase and the bad stuff out and back into the intake to be burned. With the catch can hooked in line (between PCV and oil filler nipple) the heavy stuff (oil in this case) will tend to go to the bottom of the can while the rest just goes back into the intake. Also, the nasty gas vapors coming from the evap canister also get recirculated into the engine so you don't smell gas fumes whenever you park your car (noticeable when you do an emissions delete).

Works good so far, I haven't had the can fill up on me completely but you see the regular nasty oily/water mix in there. Make sure to mount the can completely vertically or this won't work well.

Reason for doing this: to keep the upper intake manifolds from getting drenched in oil residue.

If you plan on doing the catch-can with emissions removed, you will tend to leave one opening on the catch can vented to atmosphere and one connected to either the oil filler or iron (the lazy way of doing things). Whichever one you don't use gets plugged off. When the can fills up or you take hard right turns, you will find oil spilling everywhere : )

armen505

iTrader: (3)

I have the ACV removed and blocked off, air pump removed and the 6 port actuators removed and ports stuck open. I think I'm going to try installing it "In Line" between the PCV and Filler neck and see what happens. If I notice that it's not working right then I'll have to change the hose routing and leave one openinig vented. Does that sound like the right way of going about it?

armen505

iTrader: (3)

JJcobm.......BTW Thank you for all of this helpfull information. It really helped me in deciding how to go about installing the can and what differences I might see feel or smell!! Thanks again!! I'll post up results as soon as I'm finished with the install.

jjcobm

iTrader: (18)

If you are keeping the ACV and the rest of emissions removed, keep the charcoal canister at the minimum, you will thank me. Leave the nipple on the iron connected to the charcoal canister (goes to the hard line that runs along the firewall).

Make sure you route the top hose of the stock PCV valve (you are using that right?) to the appropriate port on the side of the UIM (it needs to get vacuum as the throttle plate OPENS, not full time) and the big nipple on the bottom of the PCV to the catch can and then from the catch can to the oil filler neck. Then the smaller hose on the bottom of the PCV to the approprate port on the side of the UIM (full time vacuum).

That is the proper way of doing things.

If you want to leave the catch can vented to atmosphere, plug either the iron nipple or the oil filler (i recommend iron nipple) and run one hose to the catch can from the unplugged nipple. Then run the hose of the other end to atmosphere. Cap the hard line on the evap canister on the firewall.

I do not recommend this setup, in my experience there is no way to relieve pressure or fumes building up in the crankcase (compare this to the first setup I mentioned). I have had the so called "capped off nipple" fail and start to spew oil all over my exhaust on a road trip making me think my car was on fire. Just do it properly : )

armen505

iTrader: (3)

Got it!! Catch can goes "In Line" between PCV and Filler nipple. Keeping everything else intact as it was from factory specs with the exception of what I have already removed, air pump, ACV, 6 port actuators.

Boosted11

iTrader: (11)

Just to verify ... (as this whole catch can deal has been biting me in the ***)


Intake manifold for vacuum
!
! <--- Vacuum hose
!
!
One way check valve flowing outwards from the manifold
!
!
!
!
T ------------- Filler nipple
!
!
!
!
Catch can

Hopefully not confusing hah. I can't seem to get any thing into my can, and can't getting strange gases from werd areas. Blowing gaskets, blowing grommets for injectors the list goes on.

Right now I have a line going from the manifold, to one way check valve, to the upper nipple on oil filler tube. Bottom nipple near housing going to catch can. I've been told by lots this will work, well its not.

Aaron Cake

iTrader: (1)

There is no point to installing a catch can on a street driven NA. They don't have blowby problems.

Seems to be that adding something to the engine bay much larger then the simple stock purge valve would make it messier, not cleaner. Huh.

You have an S5? Just so you are aware, you have made your car much slower by doing this. Fixing the aux ports and VDI so they work as intended is the best solution.

armen505

iTrader: (3)

Thanks Aaron Cake, you're probably right about the catch can and the aux ports, but i think I'm going to experiment a little and see what kind of results I get with the can. As far as the aux ports go I have been thinking about getting them to function properly as well, that will be next on my list of things to do.

Here's the list.
1)Replace all intake gaskets.
2)Replace all vacuum lines.
3)Replace injector o-rings and grommets.
4)Clean aux ports and get them functioning.
5)Replace pulsation damper.
6)Replace all OMP lines.