Catch Can/PCV valve???

[tyger1]

okay so after reading several threads on how to and how not to install a catch can I have a a simple questions..

as of right now i have a RRE oil catch can with the filter on the top. i have one side from the valve cover and the othe side connected to the PCV valve. I read several threads on why this is not an ideal set up and defeats the purpose so i got another catch can this time it is sealed.. the problem or question i have is what connects to the PCV valve?

I have a Magnus Manifold and removed the emission stuff. so according to the other threads this is how it should hook up

valve cover to catch can
intake (pre turbo) to catch can

what hose connects to the PCV valve?

thanks

 

[DarthBulk]

I have a setup like yours, and I needed TWO catch cans. You have to remove the innards from the PCV valve on your valve cover, run a hose from that to the second catch can, and then run a second hose from that catch can to your intake manifold. Be sure to put an inline PCV valve in this line though, to prevent turbo boost pressure from pressurizing your catch can!

 

[tyger1]

is there any way i can do this with out a second catch can?

I really do not want to tap the magnus manifold if that is what you are suggesting. I have all the lines used up on the magnus..boost guage,brake booster,BOV, fpr etc..

can i tap the intercooler piping before the TB and run a hose to the PCV valve. I already have one (pcv) gutted and another stock one. I would like the best possible way to hook up only one catch can.

thanks

 

[DarthBulk]

That line from the PCV valve should be connected to a vacuum source. Under boost, the PCV valve closes and prevents boost pressure from entering your valve cover, but under vacuum it sucks the vapors out. If you don't use a second catch can, and connect the hose from your PCV valve to the piping before your throttle body, your throttle body is going to see a lot of oil vapor. I wouldn't do that. Using a second catch can, or routing the line from the PCV valve direct to the intake manifold (like the stock setup), is really the best way to do it.

 

[romeen]

I understand that you don't want to tap your new IM for a fitting but a properly functioning PCV system is extremely important. Running it to a fitting pre-throttle body will not work since there is no significant vacuum at that spot during idle not to mention fouling up the TB as DarthBulk pointed out.

A catch can between PCV valve and IM is not a necessity but it is preferable. If you decide to use one just use the RRE one. Simply remove the filter and cap it off making it sealed. If you do this you need to keep from pressurizing it under boost. You can do the PCV mod as DarthBulk mentioned but a better idea would be to leave the PCV untouched and use one of these inexpensive check valves between the catch can and IM.

http://www.usplastic.com/catalog/va...oduct_id=15641&variant_id=64175&cookie_test=1


Two reasons not to do the PCV mod:

1) Hollowing it a PCV valve is more frustrating than you might think.

2) More importantly, the vast majority of them leak under boost defeating the whole purpose.

That check valve is small and easily fits right into the PCV vacuum hose. It is being used by several members with good results.

 

[tyger1]

okay instead of tapping my magnus SMIM and using another catch can. can i use one of the NOS ports on the SMIM? I am not running NOS but the manifold came with nos ports.
do i still need a catch can? which intake port (1,2,3 or 4) is the best to use? here is a pic of the manifold.

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[romeen]

I'm not familiar with the Magnus IM but I don't see any reason why you couldn't use one of the nitrous ports. As long as it is basically just a direct port into the IM it should work. The downside of tapping into a single runner as opposed to the main chamber of the IM is that the particular runner will become disproportionately fouled with oily buildup. I don't know if this will affect performance but it seems like all the more reason to go ahead and use the sealed catch can and check valve like I mentioned.

You might consider contacting Magnus to see what they recommend. Maybe some other guys who are running it can provide input as to how they dealt with the PCV. Have you tried searching for this specific question?

 

[tyger1]

so i think i figured a good way to install the catch can..instead of using the NOS ports I decided to just use one of the fittings on back of the manifold and then use a tee fitting to use run the fuel pressure and boost gauge vacuum line.

thik this will be a better way?

 

[DarthBulk]

That sounds good to me. That way you will not be using just one runner for the PCV valve line, and will get a more constant vacuum at idle.