Crankcase Pressure

[C'LO]

I know there are a ton of threads on here about this, it plagues the dsm and evo community. First of all i know everyone just runs 2 fittings from the valve cover and either vents it, or reroutes it to a vacuum source (usually pre turbo), but does anyone actually care if the pressure is gone and vacuum is not present? So i've read the bible at evom that everyone with a single question there gets referred to http://goo.gl/LdMDqn im currently in page 56 , but there is no exact answer. Now they are getting into external air pumps, which I'm sure works great but a bit much, which leads me to the set up that jacks transmission did http://goo.gl/ls5ng8 which appears to be 3 huge lines from the cam cover directly to the intake, which leads me to think 2 lines can pull less, and with the lines being longer maybe they'll be pulling less. But i dont know as my engine will be having a different set up completely, and just in case i shall possibly have a valve cover made in case, just seeing if anyone else was curious enough to see if they have gotten rid of all pressure or don't care, or just have a completely different set up and have success.

 

[gst-turbo]

http://www.dsmtuners.com/threads/the-4g63t-pcv-system.366890/

 

[dustyboner]

http://www.stealth316.com/2-krankvents.htm this should work to keep a partial vacuum in the crankcase. Install a catchcan between the intake hose and valvecover to keep your turbo clean.

 

[C'LO]

Read that already, and its also mentioned in the evo thread multiple times

http://www.dsmtuners.com/threads/the-4g63t-pcv-system.366890/

What im looking for is to see if anyone has actually ever measured their crankcase pressure? I'm not looking to reinvent the wheel or say that all the setups here are wrong, Are those the same krank vents that map used to sells? because i am sure they were known for being open when they are not supposed to be , i do not have personal experience with them, but its what i read

 

[OGDSM1989]

99gst_racer has a setup in his build thread where he was monitoring his crankcase pressure w/ a GM 3 bar ( I think it was a 3 bar ) sensor .... not alot of detail but it might help.

 

[C'LO]

For the people with baffled valve covers, fittings on the passenger side, and oil catch cans how much oil does your can get? thanks.

 

[kodylk08]

For the people with baffled valve covers, fittings on the passenger side, and oil catch cans how much oil does your can get? thanks.

Also curious about this. I'm going to be setting up catch cans soon. Oil pressure is way too high after balance shafts were removed.

 

[C'LO]

Well some evo people just drill a huge hole and vent it out along with a filter on the fitting, not sure if there baffles are better than ours, but its possible, refer to post #1242 in the evo thread mentioned above

 

[ThunderChild]

been wondering about my crank-case pressure levels as well. i dont have blow-by or a popping dipstick, currently running a dual-sealed VMS catch can setup, one for pcv (with stock valve in place) and one on pre-turbo inlet.

when i get some disposable income, im going to purchase a manometer and tap into the block and VC for some readings. if theyre not ideal readings, im kicking around the idea of a vacuum pump to compensate.

 

[oneslowwdsm]

For the people with baffled valve covers, fittings on the passenger side, and oil catch cans how much oil does your can get? thanks.

Not very much. I'm currently running 2 -12 AN fittings off the side of the VC to a vented baffled can and the PCV line has a Mishimoto sealed catch can with a check valve. The mishimoto has to get emptied maybe every 2k miles while the big can barely has anything in it at 2k miles but it's not really oil, more so fuel, which I read is completely normal.

I've been on high boost setup with this catch can setup for over 5k miles at least and has seen its fair share of WOT.

Also, since your curious, I have blocked off the big can to see if my AFR's would change and went into 30psi of boost. Dip stick popped, oil seeped past the oil cap, car felt way slower like it was being suffocated. That was proof enough that the big can was doing what it was supposed to do. Also, AFR's stayed the same with it blocked off or vented to atmosphere.

 

[bastarddsm]

Don't run your crankcase vents into your intake if you like to make power.

 

[C'LO]

Don't run your crankcase vents into your intake if you like to make power.

Your solution? vta?

 

[bastarddsm]

plug it solid.

 

[C'LO]

By naming the thread crankcase pressure, I don't mean block vents specifically, and by plugging it solid you mean?

 

[C'LO]

Does any one know if a 12an fitting able to fit i place with out cutting the valve cover? thanks

 

[oneslowwdsm]

Does any one know if a 12an fitting able to fit i place with out cutting the valve cover? thanks

You would need to cut and weld fittings. This guy did it for me:

http://sleekcoating.com/

https://www.facebook.com/SleekCoatingLLC/