6G Celicas Forums

how do you install an oil catch tank/can? whats its main function?

It goes inbetween the crank case vent and your intake so that oil will collect in the catch can instead of going back through your intake tract. If you have a intercooler it is nice because it will keep sludgy oil from forming along the insides of the IC as well as the turbo, piping and intake manifold.

Some people just put a small breather filter on the crank case vent, but then all of this sludgy oil forms in the engine bay instead of anywhere else.

I'm going to buy a catch can next paycheck, its nice to keep everything cleaner inside and out.

This post has been edited by jcbass7: Dec 19, 2006 - 7:31 AM

Does the size of the catch tank matter?

the size will only effect how often you need to drain it

the size of the tank doesnt matter, however the size of the hose will matter. It has to match the size of the crank case vent because the catch tank nipples will be a different sizes. I forgot what the right size is but you could just measure it.

I have a picture in my profile you could see where i mounted mine.

the point of a crank case filter is to filter out oil vapor from entering back into the intake piping. why it goes into the intake piping is so that it pulls vapors out of the crank case, positive crank case pressure is bad and causes resistance on the internals like the crank, rods, and pistons, the less pressure the better. so pulling air from the crank case quicker will sometime add as much as 30 hp, from what ive seen on larger Turbo v8's.

you can do this by using an electric air pump to suck the air out, or do what i plan to do.
route the crank case ventilation right to the exhaust. the exhaust will actually pull the air out alot quicker and u wont have to worry about the oil vapors or any filters. but im not sure if the added oil vapor in the exhuast might make it hard to pass emissions. i don't plan on passing any test so it doesn't bother me.