Kraftwerks Supercharger Owners Thread

[CSG Mike]

Originally Posted by glamcem

Are you referring to the catch can or check valve?
for the record I have dual catch can on both PCV and breather tube

Thanks in advance

Ah, I'm referring to the catch can, but yes, you should also get a check valve. A nice metal check valve should be had for under $10 online.

[CSG Mike]

the KW thread has turned into a treatise on check valves..

1) you don't need a check valve if you are venting the block(or valve cover) to atmosphere/catch can. the PCV check valve is only there because the pcv line connects into the intake manifold for emissions compliance reasons (no venting to atmosphere). if the vent line connects to somewhere it wont see positive pressure on the outlet side(ie catch can or atmosphere), then you dont need a check valve.
4) the factory PCV might leak a tiny bit of air if the pressure delta on the inlet and outlet side of the line is over 10-15psi...but i won't cause any appreciable drop in system boost or performance what we have seen on the dyno.

Does @KraftWerks recommend venting to atmosphere or leaving everything connected?

[gmsii]

Originally Posted by CSG Mike

Does @KraftWerks recommend venting to atmosphere or leaving everything connected?

KW doesn't have specific recommendations regarding pcv, we are not in the catch can or emissions consulting business.

but it should be noted that if you are running a catch can, then you are by default venting to atmosphere. if one is not concerned with emissions compliance, there is no real good reason to route the pcv line into the manifold and burn oil vapors

[glamcem]

Originally Posted by vgi

Where is the second can? And do you have a check valve?

pictures of the dual catch cans

[gmsii]

Originally Posted by King Tut

You only need one check valve. Place the check valve between the intake manifold and your catch can. Remember that hose actually changes in size as it transitions from the intake manifold (larger) to the hose barb (smaller) on the block.

place a check valve between intake manifold and catch can? the manifold will see vacuum and boost (on FI setups)...install the check valve one way and you will have a vacuum leak, install it the other way and you will have a boost leak. if you insist on connecting the intake manifold to the catch can, what you needs is a zero-way valve. some call it a plug

or am i misunderstanding something?

[King Tut]

Originally Posted by gmsii

place a check valve between intake manifold and catch can? the manifold will see vacuum and boost (on FI setups)...install the check valve one way and you will have a vacuum leak, install it the other way and you will have a boost leak. if you insist on connecting the intake manifold to the catch can, what you needs is a zero-way valve. some call it a plug

or am i misunderstanding something?

The check valve allows vacuum to go through, but not boost just like the one on the brake booster hose from the factory.

[sw20kosh]

Originally Posted by gmsii

place a check valve between intake manifold and catch can? the manifold will see vacuum and boost (on FI setups)...install the check valve one way and you will have a vacuum leak, install it the other way and you will have a boost leak. if you insist on connecting the intake manifold to the catch can, what you needs is a zero-way valve. some call it a plug

or am i misunderstanding something?

Huh? A check valve is a one way valve. In this application it will stop pressure/air from exiting the manifold and entering the catch can. You only want air from the crank case / PCV to flow towards the manifold. You don't want boost flowing to the crank case / PCV

[post_break]

Looks like I started a shit storm lol.

[Freeman]

Originally Posted by post_break

Looks like I started a shit storm lol.

LOOK WHAT YOU DID

[TmP]

Figure it out before Sunday please so I can put my car together correctly :P

[gmsii]

Originally Posted by sw20kosh

Huh? A check valve is a one way valve. In this application it will stop pressure/air from exiting the manifold and entering the catch can. You only want air from the crank case / PCV to flow towards the manifold. You don't want boost flowing to the crank case / PCV

at idle with the throttle plate closed, the manifold is drawing vacuum...see the problem?

[post_break]

Originally Posted by gmsii

at idle with the throttle plate closed, the manifold is drawing vacuum...see the problem?

I have had the check valve installed on my car for some time. No idle issues, no weird stuff going on.

[King Tut]

Originally Posted by gmsii

at idle with the throttle plate closed, the manifold is drawing vacuum...see the problem?

Correct, that is how the PCV system works. It counts on vacuum to pull the crankcase vapors out of the crankcase and into the intake manifold. What it doesn't expect to see is 10 pounds of boost coming at the crankcase and pressurizing it. The check valve just prevents that from occuring.

[TmP]

So, I'm reading stuff about check valve yes / no / maybe. Catch cans yes / no / maybe. Oil cooler yes / no / maybe...

WTF? What do we and don't we need with this kit?