oil catch can [Merge]

[Rice Burner]

I just ordered my intake and K & N filter from Dejon and now I'm looking for a Catch Can. Does anyone know where I can get one of these? I have looked on some web sites with no luck, with the exception of (i think) Machv for $99.

Any help would be appreciated.

Also does anyone know if any one sells the rubber window trim that goes on the door for the window. You know the one at the top of the main part of the door on the outside. The black coating has pealed off and looks pretty bad.

Thanks in advance!

 

[madman]

2. The BOV line is the worst place to tap for your mbc,..... .

I know this is off topic of the catch can but can you explain please?

 

[Ski Bum]

1. The top catch can, the can should be on the none pressure side of the pcv valve. Simply put, replace the pcv with a straight fitting and some how thread the pcv valve into the catch can.

VC -> catch can -> pcv vavle -> intake manifold.

2. The BOV line is the worst place to tap for your mbc, leave the bov line un-interupted from intake manifold to BOV, take your pressure source for the mbc from the compressor housing/j-pipe/licp.

The rest looks good.

Ok, made some adjustments, hows this look?

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Is it all that necesary to have a catch can between the valve cover and the intake manifold? Does that much blowby oil pass through the PCV valve? I would just assume keep the stock setup and replace the PCV when needed.

 

[oldman]

I know this is off topic of the catch can but can you explain please?

No problem, here is one of many recent threads on this specific topic.
http://www.dsmtuners.com/forums/showthread.php?t=222766

Is it all that necesary to have a catch can between the valve cover and the intake manifold? Does that much blowby oil pass through the PCV valve? I would just assume keep the stock setup and replace the PCV when needed.

No, it's not. To me, keeping the IC clean is the only important part of this "keeping your intake tract clean" business.

 

[ZooKs]

Ok, so I've been thinking bout putting the RRE's catch can on my car and I've read like 10000 posts on this topic but I'm still confused and not sure exactly what the best choices to make are.

But what I was thinking is to get the RRE Catch Can, put a hose on the valve cover breather on it(i got just a regular breather on it right now) and put other hose coming from the PCV valve on it and plugging up the intake nipple. But is it just that easy? Do I still use the stock PCV Vavle thats on there? I've Heard ppl saying to use the intake fitting instead so do I just take it off the IM and put it on where the PCV was or go to junk yard and get another IM fitting. Can I just put a hose on that drain valve and have the hose going down to the ground somewhere and keep it open or how else exactly to you empy the can? remove the whole thing or something? or just drain it when you think its getting full?

I've heard some ppl say its best to keep the PCV there and keep it routed to the IM but then that allows the oily residue and build up to get in there which I'm sure only has negative effects, so this part is really my only issue, how to set up the PCV part of it all.

 

[crazyboost]

The only problem with having both ports being open to the atmosphere is that there won't be any circulation or source of fresh air for your crankcase. Sure there will never be any pressure build up, because now you have two vented areas which will be better under boost, but there is no vacuum source (the intake manifold's negative pressure) or a source of fresh air (the tube going from the turbo intake to the valve cover). So the vacuum won't suck all the gas fumes out of your crankcase and replace them with fresh air. Now some of those fumes will just sit in your crankcase and mess up your oil. It will start to smell like fuel so you know something is different. Most people run this with out problems but I would change my oil more often if i did. I'm gonna ditch my pcv valve and hook that source up to a sealed catch can then to a one way check valve then run it into my exhaust, so it will provide a nice vacuum without causing a boost leak (old leaky pcv) or letting all those gases from my valve cover into my intake manifold while under vacuum. Hopefully I'll pick up a few extra ponies doing this, I know it has worked for all those muscle car guys for years, so its a tried and true method. Many people run both to a vented catch can ( like RRE's) just the way you described and have had no problems with it, but I dont want to take any chances.

 

[ZooKs]

I'm gonna ditch my pcv valve and hook that source up to a sealed catch can then to a one way check valve then run it into my exhaust, so it will provide a nice vacuum without causing a boost leak (old leaky pcv) or letting all those gases from my valve cover into my intake manifold while under vacuum. Hopefully I'll pick up a few extra ponies doing this, I know it has worked for all those muscle car guys for years, so its a tried and true method.

I thought the PCV was a 1way check valve that lets air out but not back in, or does it allow the fresh air back in fromt he im?

My Intake pipe i got now doesnt have any nipples or anything just the bov connection, so that part is deff goin to the catch can.

So how would u route that back into the exahust like you were sayin? get a fitting and drill a hole in the dp or something and weld it together or something?

 

[spoolup]

it only allows air on way, but your cars intake mani develops vacuum whenever your thorttle plate is closed IE idle. There for it will SUCK the air out of the alve cover. When you enter boost. It should seal up and not allow air to flow. But most PCV valves usually leak.

 

[RedTurboEclipse]

I have my valve cover nipple vented to the atmosphere. I don't have any nipple on my intake pipe. I havn't had a problem for hte past 2 years ive ran it this way. I don't really have any blowby so it's not messy or anything

However if it will benefit me to have a catchcan installed and raise my vaccuum, I am all for it, but the big question is where am I going to recirculate after the main valve cover to catch can line?

VC nipple ------> catch can --------> ???????

 

[snox135]

You can route it back to the intake, but most people just run a overflow down and leave it open.

 

[crazyboost]

I thought the PCV was a 1way check valve that lets air out but not back in, or does it allow the fresh air back in fromt he im?

My Intake pipe i got now doesnt have any nipples or anything just the bov connection, so that part is deff goin to the catch can.

So how would u route that back into the exahust like you were sayin? get a fitting and drill a hole in the dp or something and weld it together or something?

Yes the PCV is a one way valve, but since mine is very old and is already leaking I'm just gonna get a new check valve that will last longer and is made for exhaust crankcase ventilation.
Then I'm gonna use a slash cut and weld that into my exhaust. This is a tube that has a cut at a 45 degree angle. It is place at a 45 degree in the exhaust so the opening is facing the rear. The exhaust gases then flow by this opening (no gases enter the opening because it is facing the other way) and create a vacuum because of the bernouli effect. SO this will suck fumes out of the crankcase for me, without having to dump them back into the engine. This will also help the rings seal better, less blow-by and less crankcase pressure for a slight increase in hp.

 

[mattp_65]

I was wondering if this is the right setup for the RRE catch can. With brass fitting.
Current setup

The old setup created some oil in my greddy electronic boost control box which was not good i think.With OEM PCV valve.

So which one should I use. Also should I use an OEM pcv valve or a brass fitting.
Right now I can't boost past 16 psi on the current setup and the old setup i can turn up the boost higher.
Can anyone help me out thanks
Matt

 

[spendone]

From eveything that I have read, the correct way is the diagram with the t-fitting. I myself have it set the other way around for teh fact I havent tapped out my take pipe for a fitting yet.

 

[kenamond]

The new setup looks better than the old, but I would drop the T-connector altogether, run the EBC off of the compressor outlet rather than the IM, and run the PCV line straight to the IM in stock configuration. You really should read your boost controller signal off of the compressor, or you could be overworking your turbo at partial throttle.

Also, use an OEM PCV and not just a brass fitting, as you need to block the boosted IM pressure from getting into your crankcase. If you don't, you might pop your dipstick tube out of the block or blow a seal somewhere. The PCV is supposed to close completely under boost.

 

[mattp_65]

From eveything that I have read, the correct way is the diagram with the t-fitting. I myself have it set the other way around for teh fact I havent tapped out my take pipe for a fitting yet.

But is it good to have oil seeping into the boost control box? Thanks for the help.
matt

 

[hippy]

I just got a cheap one of ebay but im not to sure if its hooked up right?? Its a tall stainless steel canister with the 2 fittings goin into it . SO what i did is run the hose of the pass side of my valve cover into the catch can and on the other nipple of the catch can i just put one of thoes crankcase breathers on it is that the right way to do it???

 

[staticbrainwash]

Technically i think you're supposed to re-route it back to the intake.

VC fitting---->Catch can ---->Intake fitting (originally from VC)

 

[No_Skillz]

Technically i think you're supposed to re-route it back to the intake.

VC fitting---->Catch can ---->Intake fitting (originally from VC)

No thinking needed. Correct way is back to the intake. Right now you are messing up your A/F. This topic is a bit so do some searches.

http://www.dsmtuners.com/forums/showthread.php?t=232883
http://www.dsmtuners.com/forums/showthread.php?t=221091

 

[staticbrainwash]

Since i do not have a fitting for the VC line on my dejon intake pipe, is there an easier way to get this to work again safely without having to drill and tap the intake pipe. Because the pipe doesn't look thick enough to tap into.

 

[Defiant]

No thinking needed. Correct way is back to the intake. Right now you are messing up your A/F. This topic is a bit so do some searches.

http://www.dsmtuners.com/forums/showthread.php?t=232883
http://www.dsmtuners.com/forums/showthread.php?t=221091

I don't know where this myth of the crankcase vent affecting the AF comes from, but it's gibberish. The computer won't care so long as the intake port from the vent is blocked and not sucking in unmetered air.

 

[staticbrainwash]

See, thats what i was thinking too. But i've now read 4 or so whole threads about this. I just don't understand how there could be an effect. Unless your PVC was absolute bunk and letting in air from the IM.

 

[Stanford]

The only way unmetered air could get in is if you went VC > Catch can > Intake AND had a breather on the catch can. The intake would be sucking air through the breather into the turbo, which would be unmetered.

You have it hooked up fine as is.

If you want to go one step further and keep the Intake Manifold clean too, pull out the PCV and replace it with a straight fitting then run that into the catch can too. Don't forget to block off the port on the intake manifold, or use it for something else so you can get rid of some of the T's which probably currently feed the MBC, BOV, FPR, Boost Gauge Etc.

 

[skinnykenny84]

I don't know where this myth of the crankcase vent affecting the AF comes from, but it's gibberish. The computer won't care so long as the intake port from the vent is blocked and not sucking in unmetered air.

I always thought the same thing. But why is there so much debate on this???

 

[staticbrainwash]

I always thought the only downside to running a "vent breather" was oil getting on all the stuff on that side of the VC.

You know though, of all the speculative posts about "effecting A/F" no one had anything to back it up. No logs or anything. I just don't understand how crankcase pressure could possibly effect A/F, unless like defiant said, you didn't cap the port on the stock intake and you're bringing in un-metered air.

 

[skinnykenny84]

I always thought the only downside to running a "vent breather" was oil getting on all the stuff on that side of the VC.

You know though, of all the speculative posts about "effecting A/F" no one had anything to back it up. No logs or anything. I just don't understand how crankcase pressure could possibly effect A/F, unless like defiant said, you didn't cap the port on the stock intake and you're bringing in un-metered air.

so far I have been using the vfaq (http://www.tgilmore.com/talon/catchcan.html) catch can for 2$ and it doesnt make a bit of mess. AND you can see when its time to clean it or just get another one. I personaly dont like the size of the pretty pollished catch cans. ie: greddy, ebay etc.....or the price!

 

[oldman]

It will affect A/F because the breather serves two purposes.

1. Under boost, PCV closed, breather allows pressure and blow by to escape with the help of vacuum created in the intake by a spooling turbo.

2. Under vacuum, PCV opens, breather provides fresh and metered air to replace the dirty blow by being sucked out by the pcv. Since a PCV system is already accounted for in the sotck a/f feedback system, a vented breather is basically a vacuum leak and will affect your A/F ratio, the question is how much.

I have never test logged between a vented and recirculated breather but I did test log with and without a pcv. With a pcv disabled, my old setup, my low trim was at 82 which was the lowest my logger would show so I was probably running even richer. After recirculating the pcv and nothing else changed, my low trim went up to 94. Now does this mean everyone will notice it on the buttdyno, probably not since most are probably running with boost leaks anyway but the answer to "whether it will affect A/F" is "yes".