datsunpilot

Hey guys here is my back story. I built the car last year drove it all summer with zero issues. Spring time installed larger turbo and got it tuned. Lots of fun having a datsun with 327hp/288tq (I can post vids on that later I drove it for a week before the tune and a week after with no issues. This past weekend I gave a friend a ride and had a oil burning smell when I got back. I previously had the oil catch can hooked up wrong from the pcv but I guess at stock boost it made no difference. Well the T on the side of the valve cover had a breather on it and it was dripping oil so I took it off and put a cap on it. This caused the dip stick to pop out and blow oil all over the engine exhaust and hood. So I ordered a new OCC to reinstal it the correct way from the valve cover to the can and down to the engine block. Well now explain this! Last night I went to drive the car from the garage where I installed the catch can at my to my dads house at the top of the road (less then a mile)... I got there just fine it made tons of power. When we arived there was smoke under the hood again, and we found another oil mess and the brand new catch can is FULL in the distance it took to drive up the hill, blew oil out the breather and all over the place again. Now mind you I didnt take a leisurely jaunt up the hill there was lots of boost but what the heck.

The mess it left out of the breather after a minute long drive


used a pen as a dip stick after looking into the can and seeing some reflection in the noticeable amount of oil it had in it


Ok so this is how it is routed. The front of the T on the drivers valve cover goes to the occ, the back of the T is Blocked off and the outlet of the can goes to the oil pan on the back drivers side of the block. The passenger side PCV now goes to the intake manifold


What gives!?
I am wondering if either A the oil catch can has to be higher then the valve cover and it is somehow just sucking the oil from the valve cover. I have heard the S13 valve covers do not have good baffling but that is 450cc of oil in less then a mile I would never be able to drive anywhere without a case of oil and rags around.
My other concern is maybe my turbo has a blown seal and it filling the valve cover somehow. Also maybe I have a bad piston ring that is building pressure in the valve cover. I just dont know. What tests should I run?

datsunpilot

bump! anyone??

illestdaniel

Your engine is either messed up or you have boost going into your valve cover check PCV valve.

datsunpilot

blah - yea I pulled the pcv valve and blowing in and out the internal valve opens and shuts but it could be faulty I could try a new one.
It seems like there is boost in the valve cover. Last night with it ideling I removed the oil cap and there was a steady strong flow of air coming out...
I am thinking about send out the turbo to get rebuilt but I also feel like there is an issue with the piston rings or something. The thing is there is no loss of power it pulls so damn hard still

RalliartRsX

I have a feeling your vacuum lines are incorrectly routed hence pressurizes crankcase, valvecover or both I would not sent the turbo out to be rebuilt just yet.

Also, if you have boost blowing by the piston/rings or oil blow by, you would notice a power decrease.

1) Check the routing of your vacuum lines (PCV, Valve Cover, etc)
2) Check your compression

driftapimp

ok u have that all wrong
the line from block goes to back of t
front of t goes to occ
and other line can be atmosphere release
or back into the intake track...
try putting a temp block on pcv side
on intake hose and let pcv free
this happens w bigger turbos on sr20dets...
try that if not u ***** have to make a racer style occ setup
google it theres a few posts on it

datsunpilot

Aww man thanks bud that makes sense I will try that tonight. You are thinking the front of the T goes into the vented OCC then the other one can just be a vent also? Do I need the PCV or should I block it off? Is it causing any issues? Yes once I added the larger turbo this all started after a few days, it was not imediately. I dont want to run anything to the intake track if I dont want to with all this excess oil right now.
fingers crossed thanks.

driftapimp

no
back of t to block
front of t to occ
block of hose that comes from pcv not pcv
so it doesnt leak air..if it stops filling with oil put back pcv and see if that helps

se200

post a pic of inder the hood. I have seen this over 20 times. Make sure your running all vac line correct. If your running high boost no factory PCV valve will last long or hold. Check and make sure you have not connected a pressure line to the PCV or any other crank case openning.

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datsunpilot

I ran the front of the T to the catch can with two vents coming out of it then the back of the T I ran to the stock seperator and then to the crank. The pcv runs to a vaccuum on the intake after the tbody. It is much better now but the two vents on the occ from the front of the T still will bubble a little milky oil through the filters under high boost but no more oil mess when I keep it under 20 psi

se200

On my SR20 I had to remove any pressure line from the PCV. Any psi of 18 or great causes the same issues for me so now I just catch cans and vent filters. All my crank case pressure issues have gone away. By the way I'm from NH also Wolfeboro.

ShadowMan

You really should run a line from the OCC to the intake tact before the turbo. It will provide the vacuum needed to depressurize the crank case. I had your problem and it ended up being broken rings and lands on piston #4. Had to rebuild it. Hope yours is a simple vacuum routing mix up.

se200

Yes this will work just watch the catch can fill level, the last thing you want is oil going into the compressor.

maximum.boost

Just wanted to post a big thank you to se200, your post in this thread fixed my issue.

Your suggestion fixed my problem of oil blowing out of my catch can under wide open throttle. Turns out the crankcase was being pressurised via the intake manifold to PCV valve track. That would also explain why my dipstick kept on blowing out and spitting oil out under full noise as well.

To fix the issue by blanking off the vacuum line from the intake manifold that went to the PCV valve and attached the PCV valve to one of the inlets on my oil catch can, the other inlet on my catch can goes to the front side of the T on the valve / cam cover. I know you're supposed to have some vacuum from the intake sucking out the mix of oil and fuel vapours, but for the time being, I'm just happy to have no oil spitting out of the catch can!