toastiepenguin

iTrader: (3)

I have a S4 NA, and found the strangest thing the other day when I pulled my Racing Beat header off. I had removed it and went to pull the gasket off the block when all of the sudden oil came pouring out of one of the holes that is below the the main exhaust port in the rotor housing.

There is a difference between the stock collector and the RB header, meaning that the stock collector has a extra hole (smaller) that matches the housing, of which the RB header blocks this.

I'm kinda stumped on this one, the FSM is not giving me any good diagrams of the plates and housing as far as casted internals go.

Internal oil rings worn out?
Too much oil on the last oil change?

Thanks for you help,

-Jon

toastiepenguin

iTrader: (3)

anyone knows what function the 2 smaller holes below the main exhaust port on the housing serves?

HAILERS

Yeah, the small round hole on the rear is the exhaust feed to the EGR passage on a series four non turbo car.

Look at your original exhaust manifold the car came with when built. It has a hole in it opposite the hole in the rotor housing and that hole in the exhaust manifold just goes inside the exhaust manifold a coupler of inches.

I'm clueless why oil would pour out that hole. I'll think of something maybe later. Odd. With the RB manifold on, then there'd be no exhaust gasses going into that passage that leads up the housing to the EGR valve. IF the EGR valve was in place it would seperated THAT passage from the OTHER passage from the EGR to the primary intake ports.........................ah, got me. Later someday.

toastiepenguin

iTrader: (3)

Thanks for the response. If an inner oil control ring was worn so that it let oil into the intermediate housing could the oil somehow get into the passages the EGR valve using in conjunction with the manifold?

I'm just throwing an idea out there, not really sure if this could happen though.


I'm going to look for more internal diagrams of the motor. I think I still have a intermediate housing somewhere around here too.

HAILERS

Is your EGR valve in place?

At the bottom, aft SIDE, of the 1986 non turbo intermediate housing, is a triangular shaped passage at the bottom. On the rear rotor housing is a similar shaped triangular passage. It mates with the one in the intermediate housing. Look INTO those triangular passages and you'll see a quater inch (approx) hole coming from the mating surface of where the exhaust manifold mates with the rear rotor housing.

So air comes from the exhaust manifold..........into the quarter inch hole in the rear rotor housing..........into the triangular area I mentioned in the intermediate housing......from there into a hole in that triangular hole that leads UP to the area the EGR is bolted down.

EGR opens up at a given time.....exhaust air goes from the passage just mentioned and into a couplle of quarter inch holes .........and those holes lead directly to the primary intake passages in the intermediate housing.

I guess if the EGR never opened, then some oil from the oil control rings might get into that EGR passage in the intermediate housing and .....just accumulate? Got me

I assume this engine has stock housings and NOT some half *** rebuild using turbo/series X housings etcf. If so, the above might not apply because the passages are not the same in the rotor housings non turbo vs turbo.

You really need to actually see the stock housings in your hand to understand what I tried to explain above. I know what I just wrote will sound like giberish even to me a week from now.