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Old 01-21-2009, 05:48 PM   #1
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SR Owners... More HP Easy Mod... Catch Can Setup

How you ask.... Negative Crankcase pressure.... Seals rings better for better compression.... HP from Negative Crank Pressure is known to make 5WHP or More....

Ok this is probably the best way and cheapest and easiest way is to hook up to vac source which true your little intake PCV does have some, but your Turbo has the most. So hook your valve cover back to your intake. Now you have blowby and most people put a catch in the front of the T and into the Intake. But you still you get oil into the intake, why you ask? Because that front T is crap design.

Ok Fine... Most SR slanted valve covers can do this no problem, why? Because their baffling in the valve cover is better than or flat tops and their valve covers ARE that little black air oil separator cans if you look up slant top pics... So what do you do?

Blu808 (Manjiparts.com) and I are working on some things for my track car to work this out on flat top valve covers. 2 Goals, Increase Vacuum and suck those pressures out of the crank to ultimately negative crankcase pressure and reduce to 0 blowby.

On my redtop with a GT2871R fully built motor and seeing constant 18PSI, I was getting blowby because that STUPID "T" on the valve cover is basically useless. So we are coming up with two products that can increase horsepower and help you save your motor.

This SRT Forums thread was THE best thing I have seen technically to read. They have a solution, so Blu808 and I are also in development for a solution

Thes engines need vacuum all of the time... - SRT Forums - SRT4, SRT6, SRT8, SRT10 & Dodge Forum

Long Story Short...

Why Flat Tops Suck. The "T" on the valve cover has baffles in the Valve cover but you get blowby from the pressurization of the crankcase (bad) and also oil is getting sucked out of the valve cover under boost. The valve cover does have baffles, but its in sufficient. In stock form the front of the "T" is hooked to the intake tube which IS the best internal source of vacuum, but that means oil gets into your intake from both the valve cover and the crankcase.

So far, Blue808 and I have managed to reduce blowby to 0 on my car. History is, I did a trackday and I was filling my can 3-4 laps around the track. Sucks! So we have gotten that to 0 for the entire day which is about 30+ Laps. Keep in mind this course has a lot of elevation changes so it will through your crank oil upwards for sure.

Pics of the solution will be up soon as well, but I have searched for like 3 months on zilvia and there has been 0 real solutions.... Nothing really has been developed for you guys, so Blu808 and I are working on it.

Just service annoucement hahaha!
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Old 01-21-2009, 05:55 PM   #2
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Old 01-21-2009, 05:56 PM   #3
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Old 01-21-2009, 05:57 PM   #4
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Sounds awesome! I have been debating a solution to this myself. Catch can here? In between there? I dunno.

Post those pics!
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Old 01-21-2009, 06:01 PM   #5
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just add one of these.


the better S14 baffling on an S13 SR.
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Old 01-21-2009, 06:10 PM   #6
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^^^ Yah that is great for Slant Tops, but a lot of people have flat tops like I said.... In that picture, the only problem is you gain nothing from that except only exiting crank pressure. There are still 2 issues, you are increasing pollution (not that I care) and 2 is have MAYBE 0 out your crank pressure, but your system I will call it isn't "actively" evacuating the crank pressure which leads to more HP and better response....

Yah we are working on the system as we speak and should have more results next week... Hopefully I can do a dyno session with everything.

Also not everyone has that setup S13.4 (MA-Motorsports style) valve cover that costs $400 big ones... which I don't have on a racers budget...

I am hopeful our solution is $200 or less.... Depending on setup...
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Old 01-21-2009, 06:17 PM   #7
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I can't wait to see the "solution".
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Old 01-21-2009, 06:35 PM   #8
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I am currently also gathering parts. If you guys know what krank vents are.... F... that I ain't paying 110 for some PCV check valves.... So this is with budget in mind guys...
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Old 01-21-2009, 06:50 PM   #9
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This is how I am doing it.

(not my car)
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Old 01-21-2009, 06:59 PM   #10
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That sound very nice ..... I cant way to see it finished
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Old 01-21-2009, 07:16 PM   #11
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well the cheapest way to do it is by
getting 2 covers 14 &13 cut and paste it ur self ...
or send both out to get fabbed up ...
buy evry thin used shouldnt be more than mabe 200 beaners.
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Old 01-21-2009, 07:20 PM   #12
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no oil in my pipes... and the turbo inlet pipe only doesnt have vacuum when the turbo compressor surges
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Old 01-21-2009, 07:31 PM   #13
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You guys do realize the PCV is on the other side of the VC right?
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Old 01-21-2009, 08:05 PM   #14
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Yah the PCV is on the passenger side on a USDM. The turbo is another good source of vacuum, you stop pressure on surge you can install a pcv there too. Another good vacuum source is the exhaust too...
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Old 01-21-2009, 08:06 PM   #15
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Quote:
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well the cheapest way to do it is by
getting 2 covers 14 &13 cut and paste it ur self ...
or send both out to get fabbed up ...
buy evry thin used shouldnt be more than mabe 200 beaners.
Ergh you sure when one cover is about 80 bux? How much welding and machine work you think its going to take to do that? Think about it...
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Old 01-21-2009, 08:08 PM   #16
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The solution we hav is very close to that, except in that picture, he is going to get oil in there when you doing drift or grip...

Side note, that is a RB, and their baffling is NOT the same as SR.

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This is how I am doing it.

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Old 01-21-2009, 08:31 PM   #17
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im really waiting to see how this turns out. you and me have been going back and forth trying to figure this out for some time now. i ended up having to put the oil separation tank back on, which totally sucks balls, and id love to have a better fix for this problem
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Old 01-21-2009, 08:43 PM   #18
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im very interested in what your coming up with
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Old 01-21-2009, 08:48 PM   #19
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Quote:
Originally Posted by slider2828 View Post
The solution we hav is very close to that, except in that picture, he is going to get oil in there when you doing drift or grip...

Side note, that is a RB, and their baffling is NOT the same as SR.

...........thats deff not a rb.......
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Old 01-21-2009, 10:25 PM   #20
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Yea that is a Toyota engine Ken.

Anyways. It is actually a really simple solution.
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Old 01-21-2009, 10:32 PM   #21
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The real solution to this is to run an external vacuum pump like NASCAR. .
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Old 01-21-2009, 10:34 PM   #22
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Yah the PCV is on the passenger side on a USDM. The turbo is another good source of vacuum, you stop pressure on surge you can install a pcv there too. Another good vacuum source is the exhaust too...
Manifold vacuum is much higher then turbo intake. The line from the intake to the T is mainly for the intake of clean metered air to the crankcase. All the shit comes out the PCV into the Intake Manifold.

Best solution is to put a Catch Can between the PCV valve and the Intake Manifold. If your are really anal, another one between the VC and the intake tube.
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Old 01-21-2009, 10:59 PM   #23
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I ahve a read a couple of different sites like 3000GT, 300zx, and SRT's and they all suggest the turbo is a good source of vacuum too.... and this increases overall vacuum from the valve cover and ultimately crankcase.... But remember the exhaust system is vacuum as welll....
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Old 01-21-2009, 10:59 PM   #24
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Manifold vacuum is much higher then turbo intake. The line from the intake to the T is mainly for the intake of clean metered air to the crankcase. All the shit comes out the PCV into the Intake Manifold.

Best solution is to put a Catch Can between the PCV valve and the Intake Manifold. If your are really anal, another one between the VC and the intake tube.
But when you really need vacuum pulled on the crankcase is when the intake manifold is under boost. Exactly why the stock PCV valve is basically a check valve which prevents boost in the intake manifold from going to the valve cover.

The turbo inlet is the best source of vacuum at WOT.
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Old 01-21-2009, 11:02 PM   #25
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...........thats deff not a rb.......
Woops that is a 2JZ.... lol...
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Old 01-21-2009, 11:07 PM   #26
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Quote:
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But when you really need vacuum pulled on the crankcase is when the intake manifold is under boost. Exactly why the stock PCV valve is basically a check valve which prevents boost in the intake manifold from going to the valve cover.

The turbo inlet is the best source of vacuum at WOT.
Exactly.

This is SR20 101 - not some miraculous discovery.

All of you should be good little turbo car owners and should still have your crank cases hooked up to vacuum already...

I don't know why anyone would have ever removed the stock setup- Nissan did that, if not anything else on the (T) series motors for a reason.

At higher boost and HP threshold/levels you can see gains of 25-70 whp...cough
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Old 01-21-2009, 11:10 PM   #27
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Thanks Steve... But that T is shit if you get some blowby... so monday ima get one more thing welded and the setup complete.... WIll take pics of course...
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Old 01-21-2009, 11:28 PM   #28
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Quote:
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But when you really need vacuum pulled on the crankcase is when the intake manifold is under boost. Exactly why the stock PCV valve is basically a check valve which prevents boost in the intake manifold from going to the valve cover.

The turbo inlet is the best source of vacuum at WOT.
How long are you staying at WOT? You are going to build up some gases at WOT from blow by. But you are going to suck them right up once you let off.



I do not understand why you guys are trying to re-invent the wheel. Quality Rings and modern piston clearance. I don't see how you are going to have major blow by.

Only gain I can see is an extended oil change intervals. Yes you can increase power by installing a PCV system. But, the motor already has one.

Splitting hairs IMHO.
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Old 01-22-2009, 12:18 AM   #29
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3 mile long road course.

s14db. You have a valid point. but his shit was really filling up every 3-4 laps. If he was sucking oil into his intake manifold through his pvc, then we would do a catch can and more work there.

We are simply helping out the stock system without having to use a vac pump.

Luke
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Old 01-22-2009, 02:38 PM   #30
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How long are you staying at WOT? You are going to build up some gases at WOT from blow by. But you are going to suck them right up once you let off.



I do not understand why you guys are trying to re-invent the wheel. Quality Rings and modern piston clearance. I don't see how you are going to have major blow by.

Only gain I can see is an extended oil change intervals. Yes you can increase power by installing a PCV system. But, the motor already has one.

Splitting hairs IMHO.
You're missing the point of my post. The PCV valve is designed to generate a small vacuum on the crankcase under low load conditions. You build boost and the turbo inlet pressure drops and the PCV valve doesn't flow either way, and the hose coming off the valve cover starts really flowing to pull a vacuum on the crankcase, which is where the majority of your blow by will happen due to simple physics.


I personally don't have my stock PCV valve hooked up to anything due to the crap that gets in the intake manifold even with a small catch can and haven't noticed any negative effects. I do have a catch can between the valve cover and intake tube with -8 AN lines which is enough flow given the diameter of a 3/8" NPT fitting that threads into the valve cover is the same ID.
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