Crank case ventilation test

**Halon** · 07-06-2009

Saw this posted on another board. I remember a few people in here being quite interested in this topic, and figured this video might be of interest to those people.

http://videos.streetfire.net/video/P...for_684587.htm

FattyBoomBatty · 07-06-2009

Nice, but how much oil is in his intercooler? I know I have pressure in my case because it sprays oil out the valve cover gasket, and I need to re-do my vent setup.

MustGoFaster · 07-06-2009

No surprise to me at all, but as stated, that system (which is basically the same as a stock + 2 lines) will put oil into the IC system.

95talonracer · 07-06-2009

Would be nice to see the before and after videos on the exact same setup.

**asshanson** · 07-07-2009

Why not use a massive sealed catch can with three inlet/outlet to eliminate most of the oil issue.

FattyBoomBatty · 07-07-2009

By sealed, you mean no unchecked vents to atmosphere?

4g63tcrazy · 07-07-2009

All you would have to do is get a sealed catch can and place it between the valve cover and intake to solve getting any oil in the intercooler.

**asshanson** · 07-07-2009

Quote:

Originally Posted by FattyBoomBatty

By sealed, you mean no unchecked vents to atmosphere?

Yea.

SnoEclipse · 07-07-2009

The questions that haven't been asked & answered are; what are the factory specs for crankcase pressure, piston blowby, and is it good or bad to be higher or lower than the spec.

Otherwise is just anecdotal speculation.

If an add-on catch can is the answer, the ones to get are the filter bottles for compressed air lines. Loads cheaper and more durable than the tiny things that are sold as PCV catch cans.

**Halon** · 07-07-2009

Quote:

Originally Posted by SnoEclipse

the ones to get are the filter bottles for compressed air lines. Loads cheaper and more durable than the tiny things that are sold as PCV catch cans.

Except that the clear plastic they are usually made out of specifically mentions that it should be used for chemicals like motor oil, and will fail eventually.

SnoEclipse · 07-08-2009

well, of course you would buy a heavy duty shop model with a bottle that can stand up to oils and underhood temps. A lot of them are tempered glass and not taiwan plastic but you have to look for yourself.

Silly Rabbit (Kill Bill is on tv right now....)

Swifty1638 · 07-08-2009

in the beginning I had a sealed catch can..ooops. Blew oil out the exhaust..not good. Fixed that RIGHT away by drilling a hole in the top of it. I sold it eventually, and got my JMF one off the FDSM, and now have -8 an lines/fittings for the vc. No more oiling issues, nothing in my intake.

123abc · 07-08-2009

On my car, I'm using a single catch can with two barbed fittings on it and a filter on top. I run a hose to the v/c breather and another to the pcv valve. It was working good but then I upped it to 20 psi and I think the pressure was actually closing the pcv valve so it was spitting oil out. I'm going to drill out my pcv valve so it's hollow since it's not circulated into the intake tract.

FattyBoomBatty · 07-12-2009

I just put my turbo back on today because I was trying to find the oil leak on the bottom of it. Turned out a metal plug that is in the g54b block near the bottom popped out and sprayed oil about 13-14" up onto the bottom of my turbo, causing all the smoke.

With my catch can hooked up like before, I used a socket to blow into the drain hose for the turbo to check for blockage, and all this air came out at my face. I thought it was coming out the exhaust manifold at first, but it turned out to be this plug was missing.

It's a press-fit deal but the crank case was getting over-pressurized and it popped out with normal driving. So, luckily I had another one and put it in with JB weld and a hammer. Should stay, but I re-did the lines for my crank case. the rear valve cover port goes down a tube to a road-draft style exit near the oil pan, and the pcv, and my -10 port go to the catch can, but now all three of the top ports are just open, and I took out all the steel wool.

The difference it clear, the car is noticably faster, there's no way for oil to enter my intake tract anywhere, and excess pressure is allowed to escape. I really was amazed at the difference in acceleration.

Before there was only one outlet going into the air filter, but it was quite obvious after these findings that it was not enough, and the nasty sludge that built up in that can was disgusting, plus I had it draining back to the oil pan (which I eliminated).

catch cans can be done right and wrong very easily. But trial and error is almost the only way to go to find the right combo for each car.

**Halon** · 07-13-2009

This weekend I noticed Kiggly looks like he is only running a single -10 (size is an eyeball quess) line from his valve cover to a vented can. Interesting I thought as he's running a lot of boost.