alright guys I've got a few questions on the subject. First question is if this isn't hooked up right as far as what hoses go where with the one way check valve pointed in the right direction will this cause excessive blow by? Basically the way I have it hooked up now is I have a hose going from the tid to the upper nipple on the oil filler neck and then from the bottom center iron nipple to a pcv/check valve and then to a nipple on the lower intake manifold (jspec place for brake booster line). The way the pcv valve is placed is that the air can travel from the center iron nipple to the lower intake manifold but can not go from the lim to the center iron.

Anyways I'm getting no smoking from my exhuast while sitting for a while wich is a common trate of the bnr turbo's without proper crankcase ventilation so I'm guessing the way i have it setup is correct however i get the most retarded amount of blow by! To put it in perspective for you I changed my oil last saturday before I got my car tuned by steve kan then on saturday got it tuned then the fallowing tuesday i checked my oil and it's about 1 1/2 quarts over! on my rebuild I replaced everything except rotors, rotor housings, irons, and side seals. The side seals where all spec'd out and tested with a feeler gauge inbetween the corner and side seal and they all where well within spec so i know it can't be that but I just don't know what it could be. My jspec engine core that i used for the rebuild had absolutely no blow by at all so I know it can't be the irons out of spec either.


note: I premix with a 128:1 ratio.

 

I'm doing this from memory so I hope I get it right for turbos...The FSM has the vac diagram to confirm.

Plug the hole in the TID.

One nipple on the center iron goes to the charcoal canister. This gets plugged if you don't have the canister.

The other nipple goes to the large nipple on the bottom of the purge valve.

The top connection of the purge valve goes to a vacuum source (after the throttle bodies).

The other bottom connection goes to a nipple BEFORE the throttle bodies. It's plumbed in after the intercooler to prevent coating the inside of the cooler with crud.

 

[QUOTE=Aaron Cake]

One nipple on the center iron goes to the charcoal canister. This gets plugged if you don't have the canister.



QUOTE]

are you telling him to plug his pcv up completely?

 

Reread what I said.

There are two nipples in the center iron: one on the iron itself and one on the oil dipstick. Both lead into the oil gallery ("crankcase"). In stock form, the iron's nipple leads to the charcoal canister. If that canister is eliminated (why???) then that nipple gets plugged.

 

thanks aaron, however I only have two nipples in total. One nipple is at the bottom on the iron and the other nipple is at the top of the oil filler neck. So I have the one at the top going to the tid and the one at the bottom on the center iron going to the lim with the pcv valve inbetween.


edit: oh yeah and charcoal canister is gone.

 

put the charcola canister back, problem solved. or get a oil uh whatchamacallit...catch can, thats it, get an oil catch can...

 

Yes, there are two nipples total. One gets plugged, one goes to the purge valve. None should lead to the TID as that will vent oil and crap into the TID. This covers the turbo compressor in gunk, fouls up the insides of the intercooler and piping, etc.

 

hum...................Interesting, thanks again aaron and others. So I just need a catch can then? Also would this be whats causing my retarded amount of blow by?

 

For blow-by, I would be first checkng A/F ratios. Just because Steve Kahn tuned it, doesn't mean that it is tuned correctly (things like cold start and daily driving are a lot different then tuning a few dyno runs). Assuming that the engine is in good shape, then excessive blow-by is often caused by too rich mixture.

 

well thats what I thought it was too however steve didn't tune on a dyno. Basically we took the car out and drove it around town and on the interstate for real world tuning wich he likes to do rather than dyno tuning it because of this very reason. Stange.

 

A while ago I found a post in an old thread in the 1st Gen section that kinda throws what I thought (and what Aaron's posted) out the window...

Now this implies that the nipple on the center housing is seperate from the oil fill passage, so that air can flow in one nipple and down to the sump and then exit though the other passage and out the other nipple. Can anyone confirm if this is correct? I haven't got a spare centre plate lying around to study.

Thanks.

 

wow don't know if thats right but he isn't the only one saying this as I've heard of a few others that run a setup like this with thier bnr turbo mainly because if you don't do this you will get heavy smoking when sitting in traffic.

 

I'm going to have to check this....As far as I know both nipples lead into the oil gallery directly...

 

Good thread!

 

ok just got off the phone with a guy that drag races these cars for a living and he says he doesn't think it's the sides seals but could be something having to do with the fuel system. he said there should always be pressure in the fuel system and if not it can cause blow-by to happen. i've noticed on my pressure regulator that when I turn the key on I get plenty of fuel pressure and then about 2 seconds later it bleeds down to almost zero. could this be my cause for the blow-by? he said to get something like aeromotive and this shouldn't happen.

edit: also can't wait to see what you find aaron!

 

I looked just at mine (S4 TII), it has one at the bottom of the oil filler neck and on at the top I dont see any more. I am having a similar problem. My top nipple Is ran to a bottle and any gas that gets into the oil collects in it along with some oil. The bottom one is caped off.

 

The pipe on the intermediate housing goes to ............that large void area between the front and rear side of the intermediate housing i.e. the area that the eccentric shaft passes through.


newbies

 

haha, you crack me up. so.....................with this piece of info being said how would you hook up the crackcase ventilation system? Also I just found that maybe a stuck injector can cause blow-by as well, is this true?

 

Fuel injectors and blowby? No way Jose.

I don't consider a injector stuck wide open being blowby and it would flood the engine out if stuck wide open. And I don't consider leaking injectors as crankcase blow by even though the fuel will end up in the crankcase eventually.

 

damn well ****! I don't know what the hell is causing my blow by issues then.

 

It's probably because you're not in the zone yo.

Get into the fixing zone!

 

I guess a stuck injector could wash the oil away from the side seals and that might create more blow by. That's the only way I can relate blowby to fuel injectors. Maybe that's what they/he meant.

 

hum..........well I guess I'll spend the 40 bux and get them tested just to see. I just gotta start elimonating ****. Jager your right I'm definatley not in the fixing zone, i've been too pissed off cause I just had to spend 300 bux on a new koyo cause I fucked my other one up

 

And is that area completely seperate from the oil fill path until it reaches the sump?

 

It's seperate from the fill path til it reaches the pan area.

It makes its way to the pan area thru the stationary gear areas at the front and rear housings.

It seems to me that pipe on the intermediate housing is goind to see rotor seal bypass air *first* so to speak??? yes.

Pop off what looks to be something like a freeze plug just in front of that small pipe on the intermediate housing and you'll see the path that is cast in the housing that leads to the eccentric shaft. Kidding.

EDIT: Actually, I just realized that I don't see how the path from that small pipe on the intermediate housing gets to the pan. I don't see how it gets by the journals that the rotors are riding in and on to the pan area thru the front and rear stationary gear areas. Soooooo, I guess I really don't know much except that the small pipe is seperate from the oil fill path. I'll work on how that small pipe path gets to the pan. Later.

EDIT 2: I found the path. It's on the other side of the intermediate housing at the very bottom. The bypassed air from the side seals of the sides of the rotors that rub against the intermediate housings gets dumped thru that hole in the right bottom area of that intermediate housing.