S14rebuild

I thought thats how the stock pcv system works though? Is it not a good design?

Im not arguing just tryn to inform myself aswell


Not go from side of vc to catch can to inlet piping of turbo

Thats just what i was told todo

PoorMans180SX

That's only half of the "pcv system". The other half is the pcv valve and the pipe leading to the intake manifold manifold. The system works fine, it just lets too much oil mist into the air intake and intake manifold. This is why catch cans are needed.

Also, generally the hoses need to be upped in size the more power you make because there's more combustion bypass.

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S14rebuild

Yea, i know the "other half" pcv valve and hose to the intake. I was just speaking on the "breather" side.


Gotcha. Thanks for more explanation

PoorMans180SX

Yeah the original point of this thread was that a hose ran from the T on an S13 SR to a catch can, to the intake resulted in a catch can full of oil and blowby at the track. Therefore better baffling is needed so oil can never make it into the intake track.

I'm going to try running a line from the crank breather tube on the block to the catch can and then to the intake. Then from the other side of the valve cover to a small catch can, through a radium pcv valve, to the intake manifold. Just eliminating the valve cover T all together. I'm interested to see what kind of accumulation I get. I may have to add another line off the valve cover depending on the volume of flow at WOT.

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TheRealSy90

Shouldn't the "better baffling" just be a better designed catch can in this situation.

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PoorMans180SX

Nah, the catch can doesn?t determine if it fills up with oil, the valve cover does. Most people don?t want to have to empty their catch can every three laps if they don?t have to.

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S14rebuild

Mysetup ill be running is s13.4 vc. Check valve(pcv) stock valvecover location to intake plenum. Left Rear vc port, to the stock block breather exit(sr20) left middle port to a catch can(no vent) the from catch can to turbo inlet pipe. Was told this is the proper and best setup.


Hope that all made sense

mr.nismo.

Thats how mine is setup as well, I just wanted to get the most optimal crank case evacuation along with ring seal promotion

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S14rebuild

As do i, just never seen or head sumone using a vacuum pump on the sr for this. Just figured the current setup is the best, optimal setup. Would be interested in seeing if adding the complexity with the pump reap any true postibe benefits aka worth the hassel

slider2828

Hey Guys,

Just updated first post with the pictures.... Technically what was designed here with Luke, they head/valve cover acts like a baffled catch can flowing back down to the oil pan. Then anything else that could "escape" is then plumbed into a catch can and then back into the intake.

Actually I have seen my design on a dyno, its pulling a lot of vacuum, how much not sure, but it was enough that a heater pipe wouldn't work and had to go to a steel braided pushlock that was stiffer. Something from like parker hydraulic push locks.

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mr.nismo.

I'm actually really surprised to hear it was enough to collapse the hoses? What setup was on it?

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slider2828

Simple setup...

256 265 HKS Step 1
Built motor
Standard S13 intake
built top and bottom end
Gt2871r .84
380whp on a dynodynamics....

Yeah I was watching it collapse the hose..... I couldn't believe it myself....

On the first post now, I show pictures of where I drilled holes as well to pull vacuum from the head.... still .... surprised it collapsed it...
I think its also the long run from the back of the valve cover to where the intake was....

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PoorMans180SX

Thanks for doing that! I want to emulate your setup, but as lame as it sounds, drilling the baffles out to get inside and clean the valvecover out after drilling, and then drilling and tapping to reinstall them is such a pain in the ass haha. I'll probably end up doing it after the car is up and running haha.

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slider2828

Yea for sure.... need a parts cleaner and then blow it out.... you could probably just slowly drill it and probably get most of the stuff out.....

Like said, I have a lot of elevation tracks like laguna and sears point, its hell on the pcv/air oil sep on a boosted 21+ psi car.

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PoorMans180SX

Well in the true spirit of my motto "moderation is for cowards", I drilled the valve cover baffles today. To me this is quite enlightening. I don't actually think the S13 valvecover has a baffling issue, I think it's a flow issue. I think the biggest advantage of the S14 cover is that it has two outlets.

As you can see, the opening to the baffles is blocked by a folded screen. The oil/gas then has to go all the way down the length of the valvecover, make a 180* turn, and then halfway down the length again and out the side. What I think is the biggest weakness here is that this is the only path for blowby to take under boost, and the valvecover outlet is very small. With only this to breathe out of, I'm betting pressure buildup causes oil to be pushed out.











I'm unsure if just drilling out the hole in the side of the valve cover will do the trick, but I'm betting it'll help. Or I could plug the hole in the side and do the welded -10 bung... Or both... Gotta do some more thinking on how I want these lines routed...

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mr.nismo.

Drill that thing out. Not sure if you want to run AN lines, but you can tap a 1/2" npt into that hole no problem. That's what I did for my mod on my 13 cover before I got a 13.4 cover.

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slider2828

Yeah it just needs inlets and outlets. Since in the original design, we just wanted a bit more flow in general, we drilled it out..

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S14rebuild

Drilled all mine, and tapped to 1/2npt-10an fittings

5t341tH

Can you guys see if mine is right?

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lexus baby

S14rebuild

I only see the left side of the enginebay in the pic...dont know if theres more or cut off.....but what i see looks correct. How do u have the other side ran(pcv valve)?

slider2828

It looks right to me..... You don't have to worry too much about PCV. If you pull enough vac and have a good pcv, the pcv will stay closed....

As long as you drilled the cover a little under the back top line.... I posted on teh 1st post.

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5t341tH

I drilled my holes further back than yours in your picture.

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slider2828

Yeah we didn't want it to be right under it just in case the head had a lot of oil in it.... But same thing it won't be a problem

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PoorMans180SX

There is room for a -10 fitting on the valvecover. I'm doing my setup a little differently, mostly as an experiment, but here's my progress.







Tapped both of the other ports with a 3/8th NPT tap...





And plugged them.

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S14rebuild

thats super interesting, so...ull be using the turbo inlet only as a vacuum source? I thought everyone(use to) make a big stink on vacuum at an idle..hence the pcv hooked to intake manifold

PoorMans180SX

I'm going to run the crankcase breather off the block to a catch can with a PCV valve in it, which will then go to the intake manifold. The -10 fitting will also go to a catch can and then back to the intake.

I don't like the idea of the PCV dumping straight to the intake manifold without a catch can.

This way while the car is at cruise and the PCV is open, it's pulling air through the air filter, down through the valvecover, into the crankcase, to the catch can, and then to the intake manifold. I'm also going to drain both cans to the sump. Hopefully this will mean zero oil mist in the intake system. The car will be run mostly on E85, so condensation/fuel is a concern in the catch cans.

Definitely an experiment, but I think it should be very high-flowing and very clean. Worse comes to worse I pull the plugs and run it differently. I'll be reinstalling the baffles with M4 screws and lots of loctite.

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S14rebuild

Ahhhj, i see and understand....

Ever since i ran an sr in my s14, 5yrs...60k plus..i never ran any pcv..just lines to a catch can to valve cover. Never had any issuse.

But now on the new motor, no reason todo it properly

PoorMans180SX

An interesting setup on this guys SR E30 that he explains at the beginning of this video. :

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slider2828

Dude that is awesome! I love that setup. Thats is pretty cool..... Thanks for sharing!

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Kingtal0n

Its about half complete, and half wrong.
1. condensation collects in one of the reservoirs because hot oil vapor contains water, and that water is pushed into the cold aux reservoir where it condenses into liquid water. This is why you never want an aux catch can positioned away from the engine's heat. And why you find the little black 'flow can' (the can on redtop engines that isn't really a catch-device) near the exhaust system.

2. They are not measuring part throttle and idle PCV signal in the crankcase or they would see that there is no suction provided by the turbocharger at those operating conditions. This is because the air filter can provide a full Atmosphere worth of pressure to that location (the tube behind the filter) at those times.

To fix this setup:
A. remove the aux, cold, aluminum box.
B. Include a factory PCV valve and intake manifold suction
C. Measure the pcv signal in the crankcase and adjust the restrictior diameter and air filter signal (at WOT) to provide 2-3" Hg at all times.