wat up?

im in the process of going turbo and i was told to get a greddy oil catch can....i did some research but still not clear on the benefits of it and wat it actually does.....can anyone of u techies educate me on wat it actually does and how it will benefit my turbo application....thanks..btw i have a 96 gsr...thanks

Travis

 

I'm no expert in this area, but this is what I've learned from research.

The PCV (positive crankcase ventilation) system purpose is to ventilate the crankcase of fumes. When a motor is running, a tiny bit of pressure can sneak past the piston rings, and builds up in the crankcase. These oily fumes actually can create a noticable resistance to the turning of the crankshaft... By venting these fumes, performance is increased, along with longetivity.

Now the stock system just vents these fumes into the intake manifold, where it is obviously mixed into the air/fuel mixture, and then combusted - the downside of this is that these oily fumes can actually hurt the combustion process, it's kinda like mixing a tiny bit of very low quality gas in your gas tank....

Using a catch can routes those excess fumes from the crankcase into a can (aka catch can). This way the air/fuel mixture that enters the combustion chamber is much cleaner - giving you more power, cleaner emissions, and less chances of running into detonation. It's a win-win option, the only problem is that it is illegal for daily driving use.

Any comments/additions? I'm not %100 sure if I got it right.

 

I'm not possitive but i don't think it's illegal as long as the catch can is sealed and does not vent to the atmosphere.

If it simply removes the oil vapor before allowing the air to be re-circulated into the intake then it's fine.

You can build your own for pretty cheap pretty easy. search on google and you'll come across a site that the guy made his own.

 

kiss - keep it short and simple

it captures oil blowing out of the engine and prevents it from entering back in through the intake manifold....the oil reduces octane rating (can cause detonation).


[Modified by Tweakmeister, 10:33 PM 10/23/2002]

 

sweet...thank you so much guyz..i really appreciate it....clears up a lot of misconceptions that i had.....anyone else?...anyone have a catch can?..how u like it?...thanks


Travis

 

kiss = keep it simple stupid

so, you hook up the the line into the catchcan coming from the PCV valve, then another hose to the intake on a turbo (because this pressure is never greater than atmospheric) as opposed the the manifold/charge line. what about the breather hose from the head that is connected to the intake hose when stock? I just have a little filter dealy on this (illegal, I suppose).

 

Heres an example of DIY:
http://www.y8s.com/celica/air-oil/

 

Well Stated MrTodd.

I belive however, as mentioned earlier, that as long as the system remains closed loop (no external ventilation) it is legal as can-be.

I have the Moroso catch can installed per ENDYN's instructions. Works very effectively. You may want to purchase a block drain plug from them (Or the whole system) so that the oil caught in the breather tank, can drain back into the galleys. This will prevent you from having to upen and wait for the contents to drain from a drain ****.
I used to empty mine every 3 oil changes. The block-plug adapter saves me the hassle.

Side Note: You are correct that excess oil vapor in the intake charge will exhibit a lean effect. Not desirable under boost or in normal operation.

Good Day.