Shop did my twin turbo kit on my LS3 and has what appears to be the crankcase port if I am correct on that one into the can into oil cap, and the manifold port capped, and the valve cover ports just vented to atmosphere....here are pics. I know everyone does this all kinds of different ways I just want to be sure this isnt gping to cause any issues down the line.

 

The catch can itself looks fine. However, in your last picture I see 3 open ports. Why did the shop leave them open? I can't tell by the picture where do the 3 ports go?

 

The two aluminum ports open/exposed are to the passenger and driver side valve cover...and the 2 black ports next to the passenger side valve cover on in that Pic I am unsure of

 

The ones to the valve cover being open won't hurt anything, though I would at least put a filter of some sort on them. The other 2 I would track down to be certain where they go.

 

not really. that defeats the purpose of the catch can. youre going to be drawing unfiltered air direct into the valve covers and have no vacuum to pull the blowby gasses into the intake. cap all the valve cover ports. the two near the engine bay are: purge valve solenoid (from fuel tanks) and NPP vac line.

def should at least put a filter on the fuel tank one so it wont draw dirt or critters into your fuel tank. I would recommend hooking it back to the purge valve though... you dont lose any power havin that hooked up.

that purge valve is supposed to sit between the fuel tank and the intake manifold vacuum so you may have yet another unmetered intake leak post MAF.

 

So those two exposed and uncapped black ports near the passenger side valve cover port are the ones you mentioned? They put a fore fuel system in...is that why the fuel one is like that? Any idea why they leave that exposed like that as well as unhook my npp stuff if thats that port you mentioned?

 

Anything on a valve cover isn't pulling anything into the engine period. A filter is a good idea simply to catch any additional oil. But again a valve cover doesn't pull any air in period.
Drawing fumes from the engine into the intake is 100% an emission thing. It actually hurts performance of an engine.

 

I am curious why those two black ports are left exposed on my passenger side pic other guy said its fuel and npp system related.

 

No legitimate shop should ever just leave open ports like that. That's backyard mechanic stuff.
I don't know where they go, that's why I asked you. If the one is to the npp then you're going to have to run it to a vacuum source to get your exhaust working again (it makes sense that one of them is that. I don't have npp exhaust).

 

I know they have the BOV tied into a fore vaccum block which runs over to the brake booster in that area. No clue why NPP was unhooked

 

Brother, what.

The crankcase is connected to the valve cover. What do you think happens when the Intake manifold under vacuum pulls air through the catch can? What should've been blowby->oil cap for this OP->catch can->intake manifold can easily become outside air and dirt and dust->valve cover->catch can->intake manifold.

The IM usually draws enough air to vent the crankcase enough to pull a little vacuum through it. Even on my cammed (low vac) engine, if i pull any of the connected ports and cover it, I can feel the vacuum build.

You CAN vent everything to atmosphere, but if youre going to do that why bother with a catch can? Also, its worse for the oil to do so since it draws outside air in during high vacuum situation (e.g. coastdown in gear). That mightymose catch can also has a relief valve built in - if the crankcase pressurizes, it will lift a rubber gasket and vent out that direction.


One of those back ports on the firewall is the vacuum line to the NPP vacuum reservoir. If you have a dual mode exhaust, I am certain it no longer works. If you do not have a dual mode, it does not matter. This can be left uncapped with no big deal except that you will prob not want to go back to installing NPP system without cleaning the line since it should go directly back to the IM. You should search your intake manifold for a mysterious port unconnected. I believe it was on the rear of the intake manifold, on a 90 degree nipple.

The other port is the fuel tank breather line that is supposed to go to the purge solenoid. It goes passenger fuel tank->charcoal canister->to the firewall->to the purge solenoid inlet->to the intake manifold.

When the fuel tank pressurizes up, the purge solenoid opens and allows fuel vapor to travel into the intake manifold so it does not vent to atmosphere (emissions stuff). you can delete it, but if you do delete it, you should definitely put a filter on it (dont cap or else your tank will pressurize when it warms up, or collapse if it cools down). You mention you have a different pump setup so I am not sure what they've done to the tank to allow the fuel vapors to vent or draw outside air back in when it cools.

*edit* i was wrong regarding the purge solenoid - it is only a one direction, to the engine during normal operation. it really is going to depend on how the aftermarket fuel system was set up. if they deleted the vent, canister, solenoid it may not be needed at all.

definitely should cap the two lines on the valve covers though.

 

Crankcase needs to be sealed, not vented. Never vented, ever. Venting we can define as a scalar pressure over atmospheric providing the kinetic energy to organize molecules once they found an exit, gaw behavior has them searching every corner of their container at random. This is what causes buildup, deposits, oil fouling, eventual failure of the engine.
The mighty mouse vent is meant to be a last resort, if you've completely ruined the PCV system that vent provides a release of pressure as a result of blowby force against the bottom of the piston rings, reducing flow throughput of the piston's gasses causing a traffic jam which traps heavy hydrocarbon oils accumulating into sticky and hard diamond like carbon deposits which gradually seize the ring and excessive wear the cylinder wall, long before the engine should have worn out if maintained by factory standards of PCV. Preventing that scenario requires PCV to suction out the blow-by and organize blowby using energy other than scalar pressure from the bottom of the piston ring's own blow-by (use an energy source other than blow-by to suction out the blow-by, this in turn prevents mixing of blow-by with engine oil and pulls blow-by out of engine oil, and the PCV system can be tuned especially for oil cleaning). Energy from scalar differential behind the air filter is how OEM engines deal with wide open throttle PCV, a pressure below atmospheric behind every OEM paper element even in turbocharged apps like Supra and Skyline. Energy from scalar intake pressure at idle and cruise handle PCV for idle cruise. The air filter producing the resistance to flow which energizes PCV at wide open throttle to keep piston rings sealed at the ends of power stroke and organizing fluids to exit the crankcase rapidly rather than search for an exit contaminating every corner and dissolving into engine over time.

 

They put in a fore dual pump system with the new rail and all that stuff, assuming thats why that was deleted?

 

And by sealed I mean pressure tested to ensure its fully sealed up with no leaking. You can pressure test a crankcase up to 1psi, around that will reveal leaking, if needed, to fix the seals. The sealing of a crankcase is essential to long engine life and maintaining lower pressure than atmospheric which helps to keep oil out of the seals. The seals help the PCV system extend the life of the seals and prevent leaking.

When the engine runs it always has flow and is never sealed like a bottle. Filtered air may flow into a crankcase and blow-by can be removed, in and out, but nothing should freely exchange with ambient environment directly(vented) at any load, all of it needs to be pulled into some kind of pump or scavenger, either a vacuum pump or exhaust venturi or the engine itself is fine but something needs to provide the energy of evacuation besides the blow-by itself.

 

Pic below shop told me that Left hand is OEM evap, right sides OEM fuel pipe, leave them open to vent, and something about right side doesnt matter really not plugged into anything. So guess all of that was eliminated with the fore fuel system...no clue.

 

You are wrong here. Please do everyone a favor and read something like HP Books How To HotRod Your Small Block Chevy. While our Gen IV sbc are different than Gen I, at their heart they are still pushrod V8's and most principals are the same.
A PCV system is simply to allow excessive pressure from the engine to vent so it doesn't do internal damage from building up excessive pressure. You can simply put a "breather" in the spot for the oil cap. A "breather" simply has a filter on it to absorb oil vapors to keep the engine clean. This was a common design on C3 Corvettes from the factory. Earlier V8's (from the '50s and such) simply vented positive crankcase pressure through a metal tube at the back of the block down to the ground. After the birth of emission controls auto manufacturers started drawing that oil vapor air into the intake, carburetor, and later throttle body to burn it a second time and reduce air pollution. Back in the '80s and '90s we would just stick part of a rag into the valve cover so oil wouldn't dirty our motors.
Please stop giving bad information to forum members.

 

So, you believe vacuum is created in a valve cover? Why does the brake booster go to the intake manifold? Why are there absolutely ZERO vacuum lines that run to a valve cover?
A valve cover doesn't provide a source of vacuum. Just the opposite, it vents pressure created by the engine period. The only reason to put a filter on anything coming from a valve cover is to capture oil vapor.
OP stated his npp exhaust wasn't working and you advised to cap the port you state goes to his npp.
Then you state to cap the port that you state goes to the fuel purge solenoid. That would cause all kinds of issues.
Please stop giving other Forum members bad advise.

 

Damn, tell me you dont understand the pcv system without telling me you dont understand the pcv system.

The catch can that OP has hooked up creates a vacuum in the crankcase. Follow the catch can lines IM vacuum->can->oil filler cap (crankcase). The catch can will pull a vaccuum in the crankcase during idle. Normally, outside air is pulled into the crankcase through what would generally be a fresh air port that usually pulls behind the air filter. if the ports on the valve cover are open, thats where it will pull from instead. As i mentioned in my previous post, you CAN put breathers on the VC, but at that point theres no point having a catch can as it will do nothing, and it is generally worse for your engine. Some will argue that it's potentially better for performance IF you have so much blowby that your catch can/PCV cant handle the vapors, causing some effective octane drop by oiling up the intake air.

You need to take your own advice and stop giving forum members bad advice.

When I answered to cap his NPP and fuel ports, he was not sure if his tuner removed NPP or if the new fuel system no longer had a purge valve system.

Regarding your "back in the days" comment - it's generally accepted nowdays that the PCV system extends engine life by removing blowby gasses from sitting in oil. Allowing the lower RPM/daily driving idle blowby back into your intake burns it and chucks it out of the exhaust instead of sitting in your engine oil.

If you are building a race car, do the PCV delete with breathers. If you are building a car to daily drive, or drive and park without doing an oil change very frequently, keep the PCV system operational.

 

Please stop trying to prove yourself right. You're embarrassing yourself. You're ignoring what I have stated and changing what you have.
You are wrong here period.

 

This is our RACE can not one of our PCV cans (not one of our wild PCV systems although it looks like it).
Hooking to the valley is not helpful, the tiny orifice is for PCV regulation not crankcase venting, but the big hose to the oil cap is already more than capable by itself.
If it was me I would hook to the passenger front cover instead of the valley to cut confusion.
Cap the valley and the driver cover.
Look for what else was left incomplete.

Then over time decide if you would rather have the fumes control and crankcase filtration of a functional PCV system vs. this RACE system you got.

We suggest our PCV systems for regular street drivers, our RACE systems for race cars, and email if you feel like you are in between; We build custom every day.

And please go straight to the source for any questions or concerns about our products. As you see all of the above did more harm than good.