Mr.1.5

No the water is condensation. Please search and find out why a catch can is good.

account2x

iTrader: (5)

Isn't it supposed to trap oil so it doesn't go through the intake? Therefore the can should be trapped with oil not water? Right

motorheaddown

I'm confused... What prevents the vacuum tap pre-turbo from just drawing air from the engine bay through the filter on the catch can. Seems like it won't serve any purpose at all.

Any experience with the set-up is greatly appreciated.

Thanks,
-scott

ICONYQ

iTrader: (3)

Man this is great as I am building the car right now and looking at best way to set this up.

RX7 RAGE

iTrader: (18)

I got that picture from supraforums. I'd also like an explanation as to why it wouldn't breathe from the engine bay through that top filter as I will also be building a catch can like the one pictured.

stockhatch

iTrader: (12)

It would pull through the filter on the can for sure. Not that this is necessarily an issue. It would really depend on whether unmetered air is getting to the cylinders or not, and I doubt it would be an issue with MAP based cars at any rate.

motorheaddown

Not much vacuum would get pulled through the catch can filter - but some would and it probably doesn't amount to much. My bigger question is whether that's enough to pull vacuum from the valve covers. After all, isn't that the point of pulling vacuum pre-turbo or post-turbo (from the downpipe)? To releave crank case pressure?

Sorry... still confused by that set-up.

-scott

stockhatch

iTrader: (12)

Vacuum at the VCs via the turbo inlet would help evacuate pressure for sure, but simply VENTING the VCs to atmosphere via the can seems to work plenty fine for most people. I think it would be better without that breather, but really the only way to know for sure is test each setup.

account2x

iTrader: (5)

Regardless won't that design ruin any scavenging effect?

http://www.toyotanation.com/forum/showpost.php?p=75474

I did some research but I am not finding a lot of good information.

stockhatch

iTrader: (12)

Yes, that's why I said I think that omitting the breather on the can would probably be better. Even so, many people in the Supra community dont run a hose to the turbo inlet at all. They simply use large diameter AN fittings and hoses from both covers to a vented can and let the crankcase vent to atmosphere. All most people are looking to do is eliminate oil mist in the intake tract and prevent seal blowout.

mr/griffin

thats up to you, and its usually an oil water mix either way do you want that in your engine?

BAD954BOI

iTrader: (5)

I read on SUPRAMANIA that it was bad to T off the 2 pvc valves on the valve cover?
and that it should be ran separate i'm not sure why but it was stated..

and for the na-t guys like myself they only used one side like this.

If the picture wasn't to clear here is the page link: http://www.motormavens.com/2011/06/c...jz-rotary-zr1/

and i also seen a diagram where they ran a line to the intake manifold and post turbo...

Anyone wish to clarify because I'm still kind of lost?

free bump

Ali SC3

iTrader: (10)

yes I would not hook it up like in that picture.
It is not a good idea to T the 2 lines together, you are basically cutting the airflow each line sees in half, unless you double the size of the line where the 2 come together and run to the can, which would be a huge hose so basically not a good idea.
second, if there is a filter on the catch can, the other piece connecting to the intake is not doing anything at all for the catch can system, it will be pulling just as much air in from the engine bay as it will be from the valvecovers, which is not helping evacuation any and probably drawing in hotter air.

proper way is to run both to catch can with independent lines.
Either run a filter on the can OR run a line to the intake pipe. Dont do both

blueboost6

iTrader: (4)

Good info.

BAD954BOI

iTrader: (5)

But what's your taker in the na- t setup cause the intake side it's being pulled into the intake manifold like factory and the exhaust side is ran to the can? would the intake side ever pump out oil like the exhaust side in the case of blow by?