EJ25 DOHC swap PCV routing/oil consumption issue

[fabiodaddy]

1999 EJ25 DOHC swap using the RMW kit.

I completed the engine swap about 4 years ago, probably 40k to 50k miles since then. I'm really happy with the upgrade, but I have had some oil consumption since the install. It seems to have more consumption when running above 3k RPM on the highway. I replaced the PCV valve and that seemed to help some, but I'm wondering if I might have a routing issue with the lines. Instructions were very vague so I could have something wrong.

I see that the hose going to the PCV valve has a T in it with one side capped. I think that needs to feed into the Air intake. The other side of T goes directly into port on crankcase and up to the PCV valve.
There is another hose coming out of the crankcase right next to the IAC and PCV. I have that routed to the air intake that also feeds the valve covers.
Engine runs good with decent power. No smoking out the exhaust, but when running on the highway I have to add a quart about every 500 miles. When running on slower roads consumption is much less.

Anyone have any diagrams on how they have routed their PCV hoses?

[MarkWard]

How do the sparkplugs look?

[skills@eurocarsplus]

I assume used engine? how many miles total on the engine?
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[16CVs]

I've been dealing with oil usage as well, 1Gt in 1000 miles. Seems to be an acceptable level by most standards.

Engine is 2.2 built by a well known Subaru builder in Wa state, engine has 30K miles on all by me.

It's pushing a non stressed 4Wd Westy with a RJES bell housing. Lots of new components and generally over maintained.

I was talking to my engine builder about oil consumption and he asked what Windage tray I have as he built this 8 years ago. He feels that having a stock windage tray Is whipping up the oil and that I should switch to a "Killer Bee" windage tray and see if it changes my oil consumption any.

I've installed it and have 2 trips planned in the next couple of weeks .with one of them totaling almost 3 thousand in a week. It was not expensive and if it helps I'm ahead if not it probably won't be worse.

Comment away, I'm not afraid to spend some money and chart a new road.

Stacy
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[wesitarz]

https://www.thesamba.com/vw/forum/viewtopic.php?t=740887&highlight=subaru+pcv

[space]

The capped port should terminate it the air intake
Thats how it is on my Daughters 99 legacy

fwiw JDM SOHC (05 impreza swap) uses the red plastic PCV valve like the DOHC
USDM SOHC (at least in the my 05 impreza) has the metal pcv valve mounted on the Block
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82 westy
w:
2.5 JDM Subie
Rear discs

[fabiodaddy]

I wondered about the plugs myself so I took a look. They actually looked pretty good except for the bit of carbon build up on them. Not a surprise for an engine that has been force feed oil for a bit. So I cleaned them up and will run them for a bit longer. At least while I am trying to figure my issue out. This was after I just completed a 2700 mile trip with unfortunately a lot of freeway miles. That's where the consumption seems to be the highest (above 3k rpm).

The engine is out of a broke ass 1999 Legacy wagon. It had unknown mileage (above 250k where the odometer quit!) but ran OK and no coolant in the oil. I pulled it and the wire harness and scraped the rest. I rebuilt it prior to installing. Well, the machine shop did most of the work as it was worn out. I had head, block and cylinders done at machine shop. I assembled it with new crank, pistons and rings. Like I mentioned, it runs great just has this oil issue.

So after finding a forum entry on another site with a guy having this exact issue it appears that he solved it by connecting the second port on the pcv fitting into the air intake. That makes sense actually as it was sucking directly from the crankcase with no fresh air to mix it with. The second port had a cap on it. I'm sure it was that way when I picked up the car as I never capped it off.

I've connected that port into the air intake and I will report back after some additional miles.

[skills@eurocarsplus]

so you expect a mystery 250k engine (with unknown mileage) that you put another 50k on (so...300k?) NOT to use oil?

dude, you got your moneys worth out of it
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[Howesight]

Hey Skills: The OP said the engine was rebuilt:


"I rebuilt it prior to installing. Well, the machine shop did most of the work as it was worn out. I had head, block and cylinders done at machine shop. I assembled it with new crank, pistons and rings. Like I mentioned, it runs great just has this oil issue."

The Subi oil consumption issue is a bit of a mystery to me. My SVX engine, which is, in many respects, just a 2.2 with two cylinders added, uses NO oil between changes. Mind you, as a 1994 engine with a design going back to the early 1990's, it may well be that the factory SVX engine did not use the currently-fashionable low-tension rings. When replacing the head gasket as preventive maintenance before doing the engine swap in 2011, I noticed that this engine was not abused and was clearly run on synthetic oil for most if not all its life before I got it at 75,000 miles. I did replace all the valve stem seals when doing the head gasket replacement.

Sodo seemed to have great success in his recent ring-replacement thread trying to solve oil-drinking in his 2.5 powered rig. See this link and go to page 9 where he reports on oil consumption after replacing his oil rings:

https://www.thesamba.com/vw/forum/viewtopic.php?t=...;start=160
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'86 Syncro Westy SVX

[skills@eurocarsplus]