SR Owners... More HP Easy Mod... Catch Can Setup

[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.

Sent from my Galaxy Note 10+ using Tapatalk

[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..

[S14rebuild]

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

[5t341tH]

Can you guys see if mine is right?

[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.

[5t341tH]

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

[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

[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.

[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]

Originally Posted by 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

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.

[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. :

[Kingtal0n]

Originally Posted by PoorMans180SX

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

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.

[slider2828]

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

[TheRealSy90]

I know the factory S13 hoses off the vc T fitting have a restrictor "Pill" inside of them.
Do the S15 hoses have any restrictor? The rear vc to crank hose and the front vc to turbo intake hose.

[Kingtal0n]

Originally Posted by TheRealSy90

I know the factory S13 hoses off the vc T fitting have a restrictor "Pill" inside of them.
Do the S15 hoses have any restrictor? The rear vc to crank hose and the front vc to turbo intake hose.

All engines requires some restriction to fresh air inlet or the pcv will never reduce the pressure inside a crankcase.

In chemistry there is a condition known as dynamic equilibrium, which is where the pressure differential inside a container is made up for by the evaporation of liquid molecules to a gas phase. For example if a cylinder is de-compressed by a piston (larger volume from small volume) there will be a pressure drop, but if the cylinder contains liquid phase solution, some of that liquid can evaporate to restore the pressure. This is called dynamic equilibrium. There is a great picture of this example in a typical chemistry book.

The goal of PCV is to take advantage of the partial pressures of liquid phase molecules, as in the dynamic equilibrium condition, within a set pressure drop (difference) as a steady state, thereby pulling the lighter liquid phase molecules (oil is heavy and stays as a liquid, while partially burnt gasoline and unburnt gasoline is light compared to oil so it can become a gas or stay as a gas) into the crankcase gas/air, so it can be removed easily by the PCV system, constantly. thus maintaining the oil quality. To put this another way, the flow rate of the pcv system by itself is not enough to pull contaminants from engine oil and remove them; there MUST be some pressure drop in the crankcase to pull light molecules from engine oil, taking them from liquid to gas state. Simply hooking a pcv valve to the intake manifold and connecting the other end of the crankcase to the air filter tract is NOT enough unless the orifice has been adjusted to accommodate the flow rate and volume of the crankcase pcv system to give the necessary drop in pressure.

The pressure drop also assists the piston ring seal, thereby reducing blow-by, and improving compression (tightness) of the sealing rings. That is why PCV is ultimately the most important system on an engine to be functioning properly; and why I go through great lengths to stress the importance of measuring it when you modify the intake filter or duct work. Without a pressure drop, the piston rings performance will suffer, the oil quality will suffer, the engine will deteriorate more or less rapidly depending how poorly the pcv is setup. All the engine's oil seals will suffer when PCV is poorly setup, but oil leaks can be pressure washed and oil seals can be replaced, so that is a secondary concern to the engine internals cleanliness and engine longevity.

Note that in many engines, the "restrictor" is simply an orifice diameter. For example in Chevrolet LS engines the "restriction" is provided by the size of the hose on the valve cover (approx 10mm~) from what I can see visually. Since the hose on the sr20 is huge (20mm~ or more diameter) it needs that restrictor to reduce the orifice diameter to create the pressure drop.

[TheRealSy90]

Originally Posted by Kingtal0n

All engines requires some restriction to fresh air inlet or the pcv will never reduce the pressure inside a crankcase.

My dog, I didn't need a term paper on fluid dynamics.
I'm asking if there is any factory restrictor in the two oem hoses on the exhaust side of the S14/15 valve cover. I don't have the oem hoses. I know S13 has them.

Care to show me how you personally have measured pressure drop in the sr20 crank case? You say this all the time but i've never seen you actually show how YOU do it.

[S14rebuild]

Originally Posted by TheRealSy90

My dog, I didn't need a term paper on fluid dynamics.
I'm asking if there is any factory restrictor in the two oem hoses on the exhaust side of the S14/15 valve cover. I don't have the oem hoses. I know S13 has them.

Care to show me how you personally have measured pressure drop in the sr20 crank case? You say this all the time but i've never seen you actually show how YOU do it.

Nonono.... dont get him all riled up.... here come 8 paragraph post with no info ull actually need/use

[e30gangsta]

Originally Posted by S14rebuild

Nonono.... dont get him all riled up.... here come 8 paragraph post with no info ull actually need/use

Lmao this man knows.

[Kingtal0n]

Originally Posted by TheRealSy90

My dog, I didn't need a term paper on fluid dynamics.
I'm asking if there is any factory restrictor in the two oem hoses on the exhaust side of the S14/15 valve cover. I don't have the oem hoses. I know S13 has them.

Care to show me how you personally have measured pressure drop in the sr20 crank case? You say this all the time but i've never seen you actually show how YOU do it.

1. its not fluid dynamics, its high school chemistry from the entry level CHM1101 book. I Would never post fluid dynamics on an internet forum because nobody can use those PDE easily.
Dynamic equilibrium:

CHM1101 book:



2. It doesn't matter what kind of engine you have, they are all the same requirements designed by the OEM Engineers around the world.
You can measure using any 0-5v 2-Bar Map sensor, exactly the same way you measure intake manifold boost pressure.

So to recap, if you can measure boost pressure, you can measure crankcase pressure. If your ECU lacks the ability (OEM ecu or PFC) You can use Arduino ($22~) with any 2-bar map sensor (0-5v sensor). Since arduino can directly measure voltage, there is no need for resistor/voltage divider as with other resistance based sensors. If you'd like to see how I do it on my Chevrolet engine send a PM and I will give you instructions, videos, pictures, part numbers for all the components I Use to do this, In fact I even have extra Arduinos I can send you one for free.

[cured13]

Originally Posted by Kingtal0n

So to recap, if you can measure boost pressure, you can measure crankcase pressure. If your ECU lacks the ability (OEM ecu or PFC) You can use Arduino ($22~) with any 2-bar map sensor (0-5v sensor). Since arduino can directly measure voltage, there is no need for resistor/voltage divider as with other resistance based sensors. If you'd like to see how I do it on my Chevrolet engine send a PM and I will give you instructions, videos, pictures, part numbers for all the components I Use to do this, In fact I even have extra Arduinos I can send you one for free.

I think I'm not the only one that appreciate your kindness and sharing.
Thank you and please post more pics and instruction here.

Ignore all haters.

[slider2828]

S14 and S15 don't have that restrictor from crank case to valve cover.

The VC design is slightly different and the air oil separation is built in vs S13 needing that copper plug in the hose and the black box can.

[TheRealSy90]

No I want to see your sr20 with perfect crank case pressure.

[PoorMans180SX]

This is pretty sweet... Radium has been developing cool parts for our rustbuckets for a while now! Their fuel line clamps and filter kit are dope as well as their fuel hanger!

http://www.radiumauto.com/Catch-Can-...S13-P2031.aspx

[e30gangsta]

Pretty steep price, and cumbersome to have to run two catch cans. Neat non the less.

[PoorMans180SX]

Originally Posted by e30gangsta

Pretty steep price, and cumbersome to have to run two catch cans. Neat non the less.

Necessary unless you delete the PCV valve or have lines running all over the engine bay. Yes, radium stuff is definitely pricey, but oh so nice, hah.

[mr.nismo.]

I'm going to use the universal P/N for my PCV side (my bay is pretty packed). But I hadn't realized how compact their cans are.

Sent from my Note 20 Ultra using Tapatalk

[slider2828]

Wow that is really cool... I wish they had the option to run all the plumbing back to intake housing.... engine always like some extra vacuum under boost

[MPIracing]

actually I don't know how to upload a photo on here...lol


been following this thread for years, love it, Here is what I did way back when, I had major issues on the track days with over flowing oil, streets was fine, yet changed the catch can to what you guys developed I only drilled 8 or so holes under the fitting welded in. and now on the track days, I don't have more than a tea spoon of oil in there after the whole day. just going for a new turbo set up now, gxt2867r on the sr, thanks again from the land of Oz!