oil catch can

[smithers584]

why does everyone get an afertmarket catch can? whats wrong with the stock one? it even dumps the oil back into the motor for you, so you dont have to drain it. is there anything wrong with running a hose from the t in your crank case to the intake and just using the stock can?

[mjjstang]

some people like bling, I know the only reason i might get one is becasue I initially threw out all the crap from that side of my motor in to the garbage, and then just stuck a breather on the t fitting, now the breather is turning into shit since its apc so i mite just get a can. ehh. although what is that thing coming from the back of the TEE, is tha tthe catch can, I think i still have mine on, im confused, ill hvae to see what the deal is.

[kensreliableb18b]

stock wont fit with aftermarket mani. jaklerjal;rjeowjl;wworkisboring.

[sideview_180sx]

people run the catch cans so the venting of crankcase pressure is collected in the catch can, running just a breather is fine, but don't you just hate having blowby all over the sides of the motor.

[smithers584]

yeah i understand the catch can theory, and yes mjjstang that canister that is, or i guess was haha, sitting on the drivers side right next to your vavle cover with a hose that runs to the T, is the stock catch can. i just rerouted mine back into my intake. the nice thing is that it dumps the oil back into the motor, you dont even have to do it! so you guys are saying that functionality of it is the same as an aftermarket one? do i have to worry at all about oil getting into my intake?

[chmercer]

people run the catch cans so the venting of crankcase pressure is collected in the catch can, running just a breather is fine, but don't you just hate having blowby all over the sides of the motor.

if you get oil in your engine bay from running a breather, just run a hose that goes to the ground instead

[Flybert]

I run one because I don't like blowby going into my intake. My intercooler pipes are clean on the inside for this reason. I can also check them to make sure they are clean. If they aren't, I know my turbo is done.

[blue109]

my stocker wouldnt work anymore because of my topmount mani, and im running a blow-through setup so the cleaner i keep the intake air, the happier my MAF will be.

[mjjstang]

ok question tho, i guess I do infact have my stock can in place, but one part of the T goes to the intake and another to the catch can, so I have the breather on my intake side of the T, cuz i didnt route it to the intake, so infact it seems like a weird design that they basically decided to cut down on half of the blow by. am i confused or what, does that T fitting somehow route most of the blowby into the catch can side. ??????

[smithers584]

ok well i hooked it up to my intake, and now when i come to a stop or idle, nothing but white oily smoke, but when i drive its fine. what is this?

[sideview_180sx]

that is oil going into your motor and degrading the purity of the gas/air mixture going in. this is why people run catch cans, so the motor is not ingesting oil into the combustion chamber.

[smithers584]

but doesnt the stock catch can work? isnt an aftermarket one the same concept?

[240silvia]

ok, if you have just a breather on your valve cover, how are you getting the pressure out of the crank case? If you are turbo, like I am, you need to get as much pressure out as you can. One side of my can is attached to the nipple on the valve cover, and the other is routed back to the intake on the turbo. The reason why the nipple on the valve cover is connected to the intake on a stock motor is to suck the pressure out of the crankcase. You run a catch can so the blow by oil won't go back into your intake. Have any of you ever took apart a 240 intake manifold after 70K on the motor? The intake is COVERED with oil gunk. God is discusting!!! lol. Anyway, it's better to run one if you are turbo. On a NA application I would at least have a breather. Anything to keep the oil out of the intake.

-Charles

[WILDACEX187]

can u hook up an aftermarket catch can to dump the oil back into the motor like the stock one?

[MikeFD3S]

Nice cans

JDM tyyyte

http://www.more-japan.com/files/d_1612.jpg

http://www.kazamaauto.co.jp/shop/goods/manager/upfile/44_143f5919389a61.jpg

Like said earlier, not completely necessary on an NA, but a good idea if you are turbo. Blow by decreases your bottom line on power because it pollutes your air fuel mix.

Btw, the above is a Kazama oil catch can, horizontal mount

[mjjstang]

ok i stil ldont undrestand, just like this picuture above shows, the can is attached to the front facing nipple on valve cover, so is stock catch can still working on the back facing nipple, there are 2 catch cans? I dont completely understand this concept, I understand that i couldnt just cap the front facing nipple because then there is nowhere for that pressure to go besides to the back facing nipple which goes back into the engine, whereas this front facing one goes to the intake. anyone know what im sayin?

[Steeles]

but doesnt the stock catch can work? isnt an aftermarket one the same concept?

YES IT'S THE EXACT SAME ONLY THE LOCATION IS DIFFERENT

[jdm538]

im going to now put a breather into my car.

[oridostyle]

does anybody have pics of oil can hooked up on their SR? i would like to put mine on, but not sure how correctly to put it.

[cotbu]

A catch can is nothing but an Oil/Air separator get that. Oil lowers octane levels, which is bad. Keeping oil out of the intake is good for pipes and combustion. The stock design is simple but flawed, it vents pressure and catches oil, BUT the flaw is that some oil may make it back into the intake.

The can on the SR works two ways, at least.... The way you may not be thinking about is oil coming up from the sump that's why it's not a straight hose running from the valve cover T down. The black can on an SR is not a CATCH CAN in the aftermarket sense of the words.

I use a clear fuel filter to separate the oil from air.

Not ready for all the bling

[veovius]

Question, I'm reading this thread, and wondering...does a S14 KA have a stock catch can?

[mjjstang]

so do you plug the rear facing nipple from the T, and get rid of the stock can or what, wasnt the stock setup where the catch can is hooked to the rear port and the pressure release to intake is at the front facing part of the nipple?

[anotherblusi]

OIL DOES NOT GET DRAINED BACK INTO THE MOTOR THROUGH THE STOCK CATCH CAN.

Pressure flows OUT of the sump into the stock catch can, into the t, and into the intake. Pressure also flows out from the rocker cover (which is internally baffeled) and into the T and into the intake.

During Vaccuum, pressure is sucked out through the PCV valve into the intake manifold. During boost, pressure is sucked out the T into the intake pipe.

NOW... here are a few ways you can do things

1 - run a breather on the T so it is no longer connected to the intake.
2 - run a hose from the T into 1 nipple of the catch tank and a breather on the other catch tank nipple.
3 - Same as 2 but instead of a breather, run a hose back to the intake.

another variation would be to remove the stock box and connect a straight hose from the sump to the T. This will give a cleaner look and allow clearance for a tubular manifold.

If you want to go a step further plug the pcv and nipple on the manifold, and run a catch tank with breather. Now your motor will be ventilated and not be sucking in any oil vapors

[fliprayzin240sx]

First off, I wouldnt suggest plugging T end that connects to the intake. All your gonna do is create enough pressure in your crankcase that it will just just push oil and air out of your dipstick. I would disconnect that T completely from your intake. You would still get some oil into your intake tract if you leave a the line connected, even with a catch can. Beside, most JDM catch cans are hollow cans. They are not entirely effective in catching oil vapor. I have a Greddy one and i had to stuff it with steel wool to make it do its job better. Its hard routing the catch can on the back side of the T since we dont have a lot of room back there between the nipple and the crankcase vent. Some people run 2 long hoses and mount their catchcans on the passenger side.

[mjjstang]

ahh its all coming int ofocus now thanks.

[WideS13]

Wow... I'm honestly shocked that people don't know how to install a catch can. Anywho, It is important to not block that. As mentioned above, pressure will build up and shoot your dipstick out. I have seen it done on a DSM that had a hood vent. After the dip stick came out the pressure diffrance from the vent and dipstick tube made a nice little venturi effect that ended up covering the guys windsheild in oil.

There are alot of ways to go about venting the crankcase. Personally, I just run a line down to the bottom of the engine bay and hace a tiny breather on it. I dont think there is a real need for a catch can, because what are you going to do with the oil your "catching" drink it? There is so little oil actually lost through the vent so it's not like your dumping oil all over the place. It's mostly vapors, but what does come out will end up on the bottom of the car or the road. The only thing you loose is the positive ventilation that is provided by the vacume pressure of the intake. Most catch cans have 2 lines so you could still hook them to the intake, but you would still be drawing in the vapors.