Catch Can Not Working

[theKnifeArtist]

It's been like 4 weeks since i've installed my catch can, and it looks like it hasnt caught anything. in the little inspection tube, all there is is a oily haze.

I have it hooked up like this. one of the nipples of the catch can's got a T and is going into the valve covers. The other is also T'd, with one side going into the accordian pipe and the other going into the throttle body how the stock PVC works.
I got an ebay catch can with fine steel wool in it. it doesn't look to be leaking.
What's wrong here?

 

[tlo86]

It's been like 4 weeks since i've installed my catch can, and it looks like it hasnt caught anything. in the little inspection tube, all there is is a oily haze.

I have it hooked up like this. one of the nipples of the catch can's got a T and is going into the valve covers. The other is also T'd, with one side going into the accordian pipe and the other going into the throttle body how the stock PVC works.
I got an ebay catch can with fine steel wool in it. it doesn't look to be leaking.
What's wrong here?

hrm what i did was sent the valve covers into a T that runs to the can and the other part of the can hooks up to the accordian pipe and thats it, works great

here is a pic

notice the silver looking hose goes to the valves and the other blue one goes to accordian... this is before i mounted the can ;p

 

[theKnifeArtist]

ah, so then i'm supposed to plug up the hole on the tb then?

 

[tlo86]

ah i forgot to add that, i capped mine off. easiest to just use a a proper cap not jsut a plug.

 

[tlo86]

it shouldnt accumilate a ton but im thinking the vac from the intake manifold you had it connected to sucked it right back in and didnt do much.

 

[shaeff]

yep, i've got my valve covers connected using an N/A y-pipe, going to the inlet on the catch can, and the outlet on the can going to the accordian hose.

i capped the TB port. something to look into is to run an inline filter, too. (which i'll be doing by the time my car is back on the road)

-shaeff

 

[starscream5000]

What about teeing the TB port back into the line going to the accordian hose??

 

[theKnifeArtist]

^ well that kind of what i have goin on.

thanks guys, i shall correct the problem

 

[jetjock]

Cap off the TB port and you won't have PCV during the vast majority of time the engine is running. Better change your oil often...

 

[Sawbladz]

Where is the catch can in the engine bay?

 

[IJ.]

Countdown to "My Main Seals are leaking" thread in 10, 9 8.......

 

[jetjock]

How can so many not understand a simple orifice based PCV system? Heaven help them if they needed to fathom the valve type.

There is no vacuum in the accordion except under boost and even then it's not much. Why would there be? Just look at the induction system. The pressure drop across the air filter and through the AFM is tiny so why would there be a delta P between ambient and the PCV port? Isn't that the reason everyone likes those "free flowing" air filters? Because they want as low a drop as possible? Put a plastic bag over the air filer and sure, you'll get low pressure on the port, but with a clean air filter there's none there. Less than a tenth inch h20. For those who don't buy into this measure it and see.

That means (if the TB port is capped) whenever the engine isn't under boost ventilation isn't positive. The port is for use only during boost and even then it depends on the positive pressure from the TB orifice to help things along. Why do you think NA cars don't have that hose? One reason I know this is because I don't waste money changing air filters until they show a specific drop. That means I have a port just downstream of the AFM for measuring that drop. It happens to be on the PCV port:

 

[tlo86]

How can so many not understand a simple orifice based PCV system? Heaven help them if they needed to fathom the valve type.

There is no vacuum in the accordion except under boost and even then it's not much. Why would there be? Just look at the induction system. The pressure drop across the air filter and through the AFM is tiny so why would there be a delta P between ambient and the PCV port? Isn't that the reason everyone likes those "free flowing" air filters? Because they want as low a drop as possible? Put a plastic bag over the air filer and sure, you'll get low pressure on the port, but with a clean air filter there's none there. Less than a tenth inch h20. For those who don't buy into this measure it and see.

That means (if the TB port is capped) whenever the engine isn't under boost ventilation isn't positive. The port is for use only during boost and even then it depends on the positive pressure from the TB orifice to help things along. Why do you think NA cars don't have that hose? One reason I know this is because I don't waste money changing air filters until they show a specific drop. That means I have a port just downstream of the AFM for measuring that drop. It happens to be on the PCV port:

heh right as i read that i remember a few years ago my friend bought a cold air intake for his civic, it didnt have a filter on and he put his hand on the tube the filter was supposed to be on and it sucked his hand in and he pulled it out bleeding.:biglaugh:

i think i need a picture of what you are talking about im tired and not following

 

[theKnifeArtist]

yes i think it was something i read from jetlock that i learned capping the TB port was a nono. so how am i supposed to have the catch can setup?

 

[theKnifeArtist]

No really..so what's the correct set up?

 

[Doward]

I would just T the vacuum between the accordian hose, and the TB - isn't that how the stock setup is? The covers are just on a T between the two? (venturi effect in action yay)

 

[theKnifeArtist]

hmm, thats how i have it, i just dont see any oil collecting. i did notice today that the bottom of the can was oilly so maybe it did leak out. i'll give it a little more time and see what happens.

 

[marc3]

't'ing the hose that goes from the can to the accordian pipe, to go to the tb would seem logical.

so this would be the real way, if not someone correct me before everyone starts doing it!!:icon_conf

 

[theKnifeArtist]

yeah thats how mine is.

 

[gilberjj]

interesting, i just ordered my catch can.... so thank you all who contributed, and if any of you object to the drawing above, please speak up now, cause that makes sense to me!