catch can and blow by help

ONLY for ADVANCED technical discussion about the 240sx!
User avatar
s13-t
Posts: 419
Joined: Wed Jun 18, 2008 6:07 pm
Car: s13 pig nose w/blacktop sr20det

Post

before my question here is the backgrounds13 blacktop swap in 1990 240 hatchok i first had this set upnotice that the breather looks oil stained. i started to notice the oil burns on my maifold and head, and my dipstick was sitting about an inch out.so after some research i think i need an oil catch can. so i purchased one from obx racing off ebay. so question one. will a catch can help to keep my dipstick from flying out, oil spurting out, and keep everything cleaner? question 2- what is the BEST way to hook it up? i have done my research and every thread says somthing differant. so here is what i am thinking.i need an oil catch can in this line (bluish hose) then i need a line from where the breather used to be to my intake after the maf but before the turbo, correct? question number 3- do i need to put a breather on the catch can itself? i have heard that if i dont then pressure can still build up.if im right about somthing, tell me. if im wrong, please give me ur opinion dont flame plz


User avatar
s13-t
Posts: 419
Joined: Wed Jun 18, 2008 6:07 pm
Car: s13 pig nose w/blacktop sr20det

Post

bumpplz help

User avatar
s13-t
Posts: 419
Joined: Wed Jun 18, 2008 6:07 pm
Car: s13 pig nose w/blacktop sr20det

Post

this is the answer i got from a reliable source

Thats a very good question that many people do not consider when they are doing their swaps. Do not take many people's opinions on the forums as fact, a very small amount of people KNOW what they are talking about. The perfect setup is the factory setup. This is in most cases hard to duplicate. I will tell you what you need to run if possible, if you need a long drawn out explanation as to why ask me and ill let you know later. Factory is best. factory, the left side of the T goes directly to the intake before the turbo, the right side goes to an oil baffle (the black box to the right of the turbo manifold) and then to the bottom of the block. this is perfect and ideal for EVERYONE. however, the nipple for the t to connect to the intake is on the stock rubber intake, which many people dont recieve, so they cant use it. the fix is to ghetto up a fitting on the intake to run that hose, the better fix is to upgrade to an s14/15 turbo, which there compressor inlets have the fitting built in. THATS THE WAY IT SHOULD BE. many people with there swaps run generic or handmade intakes that do not have this fitting, so people put a filter on the left side of the T (like yours and the car in the dvd). This will allow the engine to run properly, however it has negative long term effects. It will increase sludge buildup and cause premature engine wear due to too much pressure building in the crankcase. To the right of the T is supposed to be a black box. this is an oil baffle. the insides are the same as a exhaust muffler, it catches oil and allows in the drain back to the pan so you dont burn it in your intake. THATS THE WAY IT SHOULD BE. However, many people run tubular manifolds, which take up the room needed for this box, so this box should then simply be replaced which a generic oil catch can. One of the catch can fittings should go down to the block, one to the right side of the T. All others need to be blocked off. This is not opinion or my best guess, this is the way this stuff needs to be run for proper operation. if you run a filter on the catch can, the car will run horrible as it will cause a maf/vacuum leak. catch cans do not benefit you in any way, they are only a remedy to replace the stock oil baffle. if you install a catch can, you will have to empty it regularly and check your engine oil level more frequently. thanks -JAson

User avatar
supreamS14
Posts: 1046
Joined: Thu Jan 04, 2007 11:13 am
Car: 96 240sx S13-blacktop Sr20deT

Post

Yes nissan knows what their dooing. They put a hose from the valve cover T to the intake for a reason.


Return to “240SX Technical Forum”