M50 manifold swap questions

[sk8freakrt]

Alright...so ive searched and searched and read and read...most of the time ill find a promising thread with a link to some tutorial and then the link is a dead link from 2002.

Anyway, i havean m50 mani from a 92' 325 and an m52 from a 98' 323i vert. Ive seen kits and all that but i know it can be done diy and im a diy kind of guy so kits are just not really in the question. Ive seen some people say you dont need to keep the CCV and some say you do. I do believe i'd like to keep it, so unless somebody has some convincing evidence that i shouldnt, does anyone have some help here?

Also i have the obd1 throttle body as well so now i need to get the intake boot but can i use the obd2 MAF or do i need an obd1 MAF as well?

TL:DR 1. How do i hook up the CCV from m52 intake to the m50 intake?
2. Do i need obd1 MAF or can i use OBD2?

[DesertBMW]

sense you got the 2.5L M52, you will have better torq and power keeping the M52 intake manifold on there. And keeping it all obd2.

If you don't want that, then just get all the parts from 93-95 M50 engine and swap it to your M52b25 long block, all the parts fit.

[sk8freakrt]

I'm way past that man. I literally have everything swapped obd1, have a full swap harness and all that jazz. I just need help figuring out the ccv with the obd1 intake.

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[meanEG]

check parts look up on rockauto for maf,

I
had the same situation regarding the ccv, i had a complete m50 to use parts, so i ran the obd1 breather system. Worldpac does sell all the parts new you need.

I know you want to keep the ccv bottle, i have seen them go bad and cause a no running situation. i like simplicity of the obd1 setup. I also didnt want to tap into the dipstick.

here are the part numbers than you need to to connect the valve cover to the rest of the engine

11 61 1 738 629, Breather Connector to intake tube for idle hose
11 15 1 730 407, Breather Connector, This connects the breather hose from the pcv to the boot.
11 15 1 703 710, Breather Connector, or PCV that goes into the valve cover
11 15 1 726 828, Breather Hose, vacuum line to nipple on idle motor
11 15 1 730 507, Breather Hose, runs from pcv to intake boot.
13 54 1 738 758, Air Mass Meter Boot, intake boot it you need one. this one has 2 holes in the bottom for breather, and idle
13 41 1 738 186, Idle Control Valve Hose, valve to boot
13 41 1 738 185, Idle Control Valve Hose, valve to manifold

Worldpac has all these parts in stock. if you dont have a supplier close to you try BMW or Blunttech

[meanEG]

This is my obd1 setup.

Coming off the valve cover, i was wrong about the vacuum line. It goes into the idle solenoid


The fat line connects the idle hose to the intake boot here via a 30 degree connector, the other skinnier hose is the one from the pcv. this is the other connecter reducer that i thought you may not need. you do need it after all.

[sk8freakrt]

Hell yeah, thanks man. So you went no ccv right? Kept it simple obd1 style? I'd day that sounds like a good idea actually. Simpler is really starting to sound better.

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[sk8freakrt]

This is my obd1 setup.

Coming off the valve cover, i was wrong about the vacuum line. It goes into the idle solenoid


The fat line connects the idle hose to the intake boot here via a 30 degree connector, the other skinnier hose is the one from the pcv. this is the other connecter reducer that i thought you may not need. you do need it after all.

Where did you put your IAT? most things ive seen say get that 2 opening intake boot so the IAT can go in one of the holes. you used both for for other things.

edit: i thought i had my head wrapped around this but now im confused again. Youre calling what i referred to as "CCV", "PCV" which i totally get, but i thought you were telling me how to run without that. My brains fried from working on this thing all night and trying to wrap my head around the vacuum system.

[meanEG]

the iat is under the plenum around running 5 or 6. yes i am still running a ventilation system. it jut a regular obd1 setup, nothing different. you need to run some kind of a vent.

If you buy all the part numbers i listed you will have a complete obd1 system. you should have the IAT under the manifold as well. the piece that snaps into the valve cover is a positive crankcase ventilation (pcv) valve. it functions just like any other kind of car, negative pressure on one side, via a controlled vacuum leak.

[sk8freakrt]

the iat is under the plenum around running 5 or 6. yes i am still running a ventilation system. it jut a regular obd1 setup, nothing different. you need to run some kind of a vent.

If you buy all the part numbers i listed you will have a complete obd1 system. you should have the IAT under the manifold as well. the piece that snaps into the valve cover is a positive crankcase ventilation (pcv) valve. it functions just like any other kind of car, negative pressure on one side, via a controlled vacuum leak.

So what you're calling a pcv is that little nipple that snaps in next to the obd1 iat on the underside of the intake?

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[meanEG]

the thing that the hose is connected to that goes into the valve cover is the pcv.

[sk8freakrt]

[IMG]http://i43.photobucket.com/albums/e384/junkgrrl/IMG_20140317_110958_845_zps72b25c33.jpg

the thing that the hose is connected to that goes into the valve cover is the pcv.

Ok, after looking at this over again, i finally get it. But how does this vent the oil from the crankcase? seems to me its just dumping it in either the intake or ICV?

edit: when you say the small hose coming from the bottom of the PCV goes to the "idle motor" or "idle solenoid" you are referring to the ICV correct? because if thats the case, the top hose leads to the intake boot, and the bottom vacuum line leads to the ICV and that means all the crank case is venting to is those two things. If it was the real OBD1 setup, wouldnt it vent to a charcoal canister or something? IDK if my ICV has a small nipple like that, when i was looking at it earlier im pretty sure it just had the two large connections (one going to the intake boot and the other to the manifold) I have finally grasped every bit of this except where that small hose on the bottom of the PCV goes. To me it would have to either vent to atmosphere or at least a breather filter like old muscle cars. im pretty sure OBD1 cars went to a charcoal canister, which i think i actually have. If the bottom hose went to the ICV it would be dumping oil blow by into it would it not?

By the way, thanks so much for sticking with me on this and being really helpful, its much appreciated.