turbo seal leaking bad, oile pressure question, and crank vent setup question.

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KEMP
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Car: 1990 240sx CA18DET

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so, my turbo has takin a ****, its smoking badly, but even more so once i T'd in the exhaust side crank vent, into the intake side crank vent that goes to the PCV valve.

I was wondering about how much oil psi should an oil cooled only turbo be running? and if i should be using a restrictor with this turbo(garrett 50trim t04b), and if so, what size restrictor?

also what kind of setups are you guys running for the valve cover venters, the one that goes to the turbo intake stock, was pushing mass amounts of oil which made me stick a breather filter on the line with a homedepot catch can for the mean time. it still pushed oil out of the filter, quite a bit too. so i t'd it into the other line that is on the intake side of the motor, whats some ideas to set this up? i feel like as soon as i t'd it in, it smoked even more.

Thansk, thoughts and ideas will be greatly appriciated.

oh, also, what is weird, is the turbo has a little shaft play, but not too much, i have ran turbos on other cars with more shaft play than this one, with no problems, so im pretty confused.
Modified by KEMP at 8:58 PM 1/14/2009


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ca18detgabby
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sounds like you need to do a compression check. I would guess your engine is needed a rebuild, but those numbers will tell you more.

I would check and make sure the motor is ok, before I worried about slapping another snail on there

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KEMP
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ca18detgabby wrote:sounds like you need to do a compression check. I would guess your engine is needed a rebuild, but those numbers will tell you more.

I would check and make sure the motor is ok, before I worried about slapping another snail on there
i just put a cometic head gasket on with arp studs, comp test was fine, as well was leak down when i pulled the head, it runs great now that i got the spark issue fixed, it runs great, i was wondering if the t could cause more oil going into the pcv valve causing alot of smoke due to excess oil?

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float_6969
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is the PCV valve working? There is a couple of links in the Stickies on different ways to route the PCV lines.

I'm having trouble picturing how you have your routed. Can you post a picture?

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KEMP
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its a new pcv. but i will h
float_6969 wrote:is the PCV valve working? There is a couple of links in the Stickies on different ways to route the PCV lines.

I'm having trouble picturing how you have your routed. Can you post a picture?
its a new pcv, but i will recheck it.

ok try to picture this, the line going to the turbo intake from the exhaust side valve cover, has been routed across the top of the motor, and t'd into the line on the intake valve cover, the one that actually goes to the PCV valve. and the intake on the turbo is capped.

do you get what im saying? i think that might have been a bad idea, any thoughts?

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float_6969
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why did you do it that way? Now there is no negative pressure being applied to the crankcase when the intake manifold is on boost.

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Cams
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This is a picture of how my car used to be, bone stock. Since it is an Euro spec s13, it is supposed to be fine like that as long as the PCV and turbo intake points are left connected in order to relieve the pressure on the intake valve side and thus on the crankcase during boost and vacuum (this is how I understand it works, so pls correct me if something is wrong)

Right now Im using a catch can connected to the exhaust valve side, the intake side connected to the PCV, and turbo intake blocked off. I think catch can isnt doing much, but oh well.

When my turbo got busted there was at least half a quarter of oil in the SMIC, and was blowing lots of white smoke when idling. As stated above, if compression is good, then its definitely the turbo.

Question: if the breather line from the crankcase to the intake valve side gets blocked off by dirt and such, wouldn't the pressure try to get relieved thru some other way??

dash
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check out LEE's pulsar recently posted, for simple PCV route is your turbo drain free, clear, no kinks ?

what about the hose from the rear of the intake cam cover down to the block ?

what solved your 'spark problem' ?

bentvalves
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block your PCV, or weld it shut.

run both intake and exhuast valve cover breathers to a nicely sized catch can that is vented to atmosphere well.


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KEMP
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well, it is pushing alot of oil out of the exhaust side valve cover now that i have routed it back to the turbo intake.

it is alot of oil, its enough to think that if i were running a catch can i would be emptying it every 20 mins.

any ideas why?

or any ideas of how to fix it? should i run both to a catch can and then vent it back to the turbo intake?

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float_6969
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move the catch can to be inline with the exhaust side valve cover and the turbo intake. See how much oil you get.

Excessive blow by is only caused by poorly sealed combustion chambers. That can be caused by bad rings, broken ring lands, cracked pistons, or damaged cylinder walls.

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KEMP
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float_6969 wrote:move the catch can to be inline with the exhaust side valve cover and the turbo intake. See how much oil you get.

Excessive blow by is only caused by poorly sealed combustion chambers. That can be caused by bad rings, broken ring lands, cracked pistons, or damaged cylinder walls.
sweet, more problems, lol

i placed it how you said, with out a catch can, and there was a lot of oil in the turbo inltet.

catch can goin on in the morning.


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