Is this an okay catch can?

[1Gina2G]

Hey everyone, getting close to finishing my rebuild, and was wondering through the parts I had and I remembered this catchcan that came with my car from the previous owner (new, unopend box) and was wondering if it was okay or even worth it to use this kind? I think it's a universal catchcan, since there's no brand name or markings anywhere on the can.

Is there a way to tell if a catchcan's any good or not? Are ebay catcans (like this possibly) any good at all? What are good brands for catchcans?

Does it matter which kind of catcan hooks up on either side of the PCV system? Like one specifically for the intake manifold to the valvcover, and one specifically between the intake pipe and the valve cover?

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[Calan]

Blow-by is basically exhaust gases trapped in the CC. Metered vs. unmetered has nothing to do with anything; you simply want some type of low pressure potential applied to the VC to help excess CC pressure overcome line/fitting restrictions and find it's way out.

Running it back to the intake can affect AFRs slightly depending on how rich or oily the blowby is, but it's because your changing the chemical composition of the air entering the engine...not because it is metered/unmetered air.

 

[jtmcinder]

Yeah, but whatcha think of this idea of having the blow-by fed back in *before* the MAF? That's the really cool thing that we're having some fun with here.

 

[XiKeiyaZI]

Well, in any case I'll just settle with the idea that either way it's negligible as it showed absolutely no performance loss or gain nor did it present a mechanical issue during a year of driving with said air being metered by being recirculated before the MAF.

It's understood why it's routed to a vacuum source; to help draw any gasses out of the crank case. That is unquestionable and why for our vehicles it is mostly required for it to function correctly unless you are generating enough blow-by and have the proper evacuation measures in place that it can find it's own way out.

Thanks for the delicious meal.

 

[DeadlyScone]

Another delicious meal(snack) is some good ol' Popcorn. Cheep Cheep.

 

[TrevorS]

thanks a lot, do you know the best place to find a low cost catchcan that's reliable? is ebay.a bad idea? they have cans as low as 25 but there's some 40-$50 one's that look nice.

Here's what I did (Ebay can !
http://www.dsmtuners.com/forums/bolt-tech/419430-would-appreciate-input-catch-can-install.html

 

[1Gina2G]

^ +1 mine only has 2 outlets on it one for the vc and one for the PCV valve. so i should run 1 hose to vc, 1 hose to PCV, remove filter and run a hose from intake pipe to can?

So am I understanding this correctly? 1 hose from the valve cover as in the left side of the valve cover to the can, 1 hose from the actual PCV valve at the top of the valve cover, and after removing the filter at the top of the can, run a hose from there to the intake pipe?

Doesn't that leave the port on the intake manifold exposed?

 

[Calan]

Yeah, but whatcha think of this idea of having the blow-by fed back in *before* the MAF?

Sounds to me like a sure-fire way to kill a MAF; especially if the line to the crankcase is unfiltered.

Doesn't that leave the port on the intake manifold exposed?

Yep.

You didn't read the whole article Brian linked to did you?

 

[1Gina2G]

Yep.

You didn't read the whole article Brian linked to did you?

I did, and I looked over it again, the diagrams show the nothing going to the manifold, so I guess it's alright to just cap off the port?

It just confused me since the above pic shows the vented can connected to both sides on the valve cover, so it's just wrong because there's no vaccum source correct?

I thought there may have been an important reason why people keep the 2 seperate ports away from eachother in different cans

 

[snowborder714]

Or use it for something that needs a vacuum source.

 

[1Gina2G]

I'm just trying to figure out what is the best way to hook up the can I have since the guy above me has the same kind too, the vented kind.

I thought the best way to use a catchcan if you only have 1 is to hook it up only to the side of the valve cover, and to the intake pipe.

Since this can has 3 ports after taking the breather off, I should connect the lower side hoses to the side of the VC and the PCV valve&check valve? With the top hose running to the vacuum source, the intake pipe?

Or is my can to small?

 

[Calan]

It's not the size of the can... it's the fact that they typically have no filtering in them. That means that if you hook it up as a closed can between the VC and turbo inlet, all the nasty blowby coming out of the crankcase is just going to get sucked right through the can and into the intake track. You may collect a little in it from heavy suspended liquids falling out or from condensation, but it's probably going to do more harm than good in the long run if you plumb it back into the intake.

Personally, I would either just run it as designed...open and vented with two incoming lines from the VC, (as large as possible) and bypassing the PCV valve, or get a proper filtered can if you want to run something back to the intake.

 

[PerfectStorm]

Where would one find such a catch can with two inlets and two outlets as designed. I've looked at six so far and have not come close to finding one without it being "fab'd"

 

[Calan]

Where would one find such a catch can with two inlets and two outlets as designed. I've looked at six so far and have not come close to finding one without it being "fab'd"

Funny you should ask. See my sig?

My design just uses one outlet, but: Filtered Catch Cans - DSM Classifieds

(Please PM me or send an email for any details...not here in the forums).

 

[PerfectStorm]

Funny you should ask. See my sig?

My design just uses one outlet, but: Filtered Catch Cans - DSM Classifieds

(Please PM me or send an email for any details...not here in the forums).

All over it. TY

 

[Calan]

Distribution block for his meth/alcohol/water injection nozzles.

Edit: I thought you would've noticed the 4 nozzles on the upper IC pipe. We all learn something new everyday man.

I did notice, but like most I simply assumed that he was overcompensating by being a jackass as we can tend to be and run 4 consistent sources for vacuum.

Now considering that they are the exact same part used for separate functions one can agree that certain things can be misleading.

I just read through this part of the thread. Regardless of the part names, nozzles, etc., I don't know how lines going into the UICP could ever be confused with vacuum lines... but I'm glad it all worked out.

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So this is wrong?

It's not really "wrong" at all...it's just not ideal. And in some cases, that ^ is the only option.

 

[jcarmichael]

Our cars don't come factory with venting the PCV gases and breather all in one can. It may vent them out under extreme pressure, but i have the impression that you need a vaccum source to suck the PC gasses out of the can.

Like that other guy said, replace the filter with a hose to a vacuum source.

on this setup does it remove the check valve between the intake and valve cover or is it just not drawn into the picture. If it removes it off the intake I am guessing that is where you put the second line going into the catch can?

 

[TSITurbo95]

Yes, you plug the port on the intake mani and get rid of that line. You run 2 lines from the valve cover, and 2 to the intake pipe. The vacuum from the intake pipe will suck out the vapers/blowby.