TOPIC: 1985 Subaru Solving the Crap-suck Syndrome!

OK I thought I'd show everyone the Air Oil Separator setup on my '85 Subaru, E87 feedback carb base model engine.(OR- how I solved my Crap-Suck Syndrome)

I'm still a compewtur idiot I don't know how to add graphics to pics. So I'll have to give verbal descriptions and rely on your eyes to help understand (sorry...!)

This won't LOOK like anything else out there, Subie's are weird!

Mine's carbureted w/ an air cleaner. PCV valve is on back lower center of intake manifold, capped off (cause PCV valve IS the vacuum source on this engine) not visible here.

4 cyl pancake flat-4 type motor 2 cyl. each side, so 2 valve covers. Originally had driver side nipple on valve cover connected to PCV valve on intake man.

Pass. side valve cover nipple had hose to pipe on air cleaner that led to port inboard of air filt.

So passenger side was passive fresh air inlet from air clean., driver side was crankcase outlet going to PCV valve on intake man.

There is an extra pipe on air cleaner housing on driver side, leads to opening inboard of air filt. SO...

I capped PCV valve. Left pass side alone. Re-routed driver side PCV hose onto pipe leading to inboard of air filt.

This was same thing as other PCV re-route setups, done to suit this engine.

Problem was LOTS of oil/water glop was literally collecting in these air cleaner housing pipes and puking up right by carb air inlet. It even caused my car to suddenly act like I had lost a cylinder one rainy night as I was searching for an address on a dark street, musta fouled a spark plug BADLY I had it towed to a Subaru specialist shop and left it for a week. Problem mysteriously went away they found nothing???!

HUH?

Did research found out about factory installed air oil separators used on Euro vehicles. Found simple ones adaptable for universal use. Then made a home built version as second option.

I've already posted about the Euro factory ones and my homebuilt version, look here:


and here:

I got 2 different AOS's, a small gray one for a Jaguar and a black tapered cylinder one for a 90's BMW from ebay. Spliced both into the hoses from the valve covers. Legnthened the return hose from the driver side AOS(originally the PCV hose) around the spare tire in back to give proper gentle radius bends to connect to pipe on air cleaner.

and each AOS has a small PVC plastic catch bottle connected to it's drain outlet nipple, using 3/8"ID fuel hose. I just unscrew the bottom cap on drain bottle and dump out, it's 99% water condensate.

Result: No more glop/crap/milkshake S%$$# going into my carb! no more mystery engine stalls!

I realize my car might be an extreme example of this issue. But I have seen similar on every engine I've Grooved and done the PCV re-route on. Last summer an '06 Avalanche I did was sucking a fair amount of oil through the breather hose back thru the TB. That freaked out some mechanic and the owner who had me replace Grooved TB and remove PCV re-route hoses back to stock. 2 other vehicles are still Grooved and Re-routed, but exihibited the Crap-suck Syndrome.

Ever seen inside a used engine? Ever pulled an intake manifold or cylinder head? What's that crud on the backside of the intake valves? The carbon on the pistons? The crap fouling the spark plugs?

I humbly submit that the PCV Crap-Suck Syndrome causes a LOT of it. It fouls the nest inside most all engines. It shortens engine life. It adds to emissions. It costs power and robs MPG.

It SUCKS!

and the Gubmint mandated PCV Valves starting 50 yrs. ago to replace road draft tubes.

Automakers complied.

PCV valves were the first Emissions control System, and they DID reduce emissions.

They also cause everything I'm saying. All other emission control devices/systems grew up around the PCV Valve.

And our Re-Route of the PCV hose can make the Syndrome visible where it was subtly invisible before...

And, it's largely invisible to consumers, and not completely understood by mechanics and Tech's

Well, Bunkie here's my answer...

for internet searches: PCV Valve Condensator Oil catch can air oil separator air compressor oil separator

Tracy G