catch tanks

88.4ageGT · Post by **88.4ageGT** » Tue Feb 15, 2011 5:52 pm

whats the best way to put a catch tank into a 4age
cam cover to tank? back to manifold?

thanks

MAC_HATER · Post by **MAC_HATER** » Tue Feb 15, 2011 6:07 pm

yeah thats how i did mine years back - any blowby that pushes oil out the cam cover gets caught in the tank and the air continues to the intake that way

didint get to use it long enough to get a proper gauge on its effectivness though but its the logical way i think anyway

Brawler · Post by **Brawler** » Tue Feb 15, 2011 6:53 pm

Why does oil even go back into the intake, wouldnt it just get burnt? I can only think of negative reasons for doing so

Quirky · Post by **Quirky** » Tue Feb 15, 2011 8:07 pm

Brawler wrote:Why does oil even go back into the intake, wouldnt it just get burnt? I can only think of negative reasons for doing so

In Australia, it has to be plumbed back into the intake.
Otherwise the fumes are deadly or something.
Mines just vented to atmo, smells AWESOME

h8wrxs · Post by **h8wrxs** » Tue Feb 15, 2011 8:23 pm

what is the reason for upgrading to a catch can in the first place, why dont standard cars run them?

iOnic · Post by **iOnic** » Tue Feb 15, 2011 8:50 pm

What's the point: During normal operation some combustion pressure leaks past the piston rings into the crankcase causing it to pressurise. This pressure needs to be vented somewhere otherwise it causes seals to blow out, bad oil drainage internal drag which = less efficiency etc etc. In early systems it was just vented to the atmosphere. Nowadays with emissions standards (actually since about the 80's) it's not really environmentally friendly to vent oily vapours into the atmosphere so there are crankcase venting systems in cars that vent the oily vapour back into the intake of the car to get sucked up by the engine and burnt off - makes the hippies somewhat happy (hippies are never completely happy), hippies buy said cars, car manufacturers are happy.

Trouble with your engine sucking in oily air though is that it reduces the effective octane level of your fuel which can = detonation and therefore lower performance. Not a problem on a factory car - can be a problem on a modified car that is closer to the safe limit. People that like going fast don't like this. That and it makes your intake/turbo etc oily and generally scody.

Catch can (depending on design) catches the oily vapor, separates oil/air, vents the air to atmosphere (or back into intake minus the oil) and stores oil in a can that you can drain later. Some drain the oil straight back into the block/sump so it's a completely closed system.

Bit more to it but in a nutshell that's basically it. Some cars have factory catch tanks eg: 93/94+ Turbo MR2

matt dunn · Post by **matt dunn** » Tue Feb 15, 2011 8:58 pm

h8wrxs wrote:what is the reason for upgrading to a catch can in the first place, why dont standard cars run them?

As cars would never pass emissions regulations required without them.

MAC_HATER · Post by **MAC_HATER** » Tue Feb 15, 2011 9:00 pm

Brawler wrote:Why does oil even go back into the intake, wouldnt it just get burnt? I can only think of negative reasons for doing so

yeah its great - when i go WOT in the celica it just pisses oil into the intake and i get an awesome smokescreen that makes vegans cry

yeah the 3S-GE is about facked

Brawler · Post by **Brawler** » Tue Feb 15, 2011 9:18 pm

could probably hore up one with a garden hose and a coke bottle

MAC_HATER · Post by **MAC_HATER** » Tue Feb 15, 2011 9:33 pm

thats pretty much what most catch cans are - something to disrupt the airflow so the oil stays in the bottle while the air goes back out

some really expensive cans do other things but your average $80 simota can is just a can with 2 holes in it and a oil level gauge thing

ATAl · Post by **ATAl** » Wed Feb 16, 2011 8:18 am

Just run a hose from both air vent lines in the cam cover under the car and into the air stream, cheapest way to do it and it's effective.

allencr · Post by **allencr** » Wed Feb 16, 2011 7:42 pm

Put the cam cover with the vent on the exhaust side. With that swap, the blowby from your tired engine will have a more direct route out and won't take nearly as much oil along for the ride.

88.4ageGT · Post by **88.4ageGT** » Wed Feb 16, 2011 8:06 pm

i kinda understand that but can u draw a diagram or show me a picture of this?

thanks

allencr · Post by **allencr** » Thu Feb 17, 2011 7:10 am

88.4ageGT wrote:i kinda understand that but can u draw a diagram or show me a picture of this?

thanks

No. Sorry.

Crucible · Post by **Crucible** » Fri Feb 18, 2011 8:58 pm

iOnic wrote:What's the point: During normal operation some combustion pressure leaks past the piston rings into the crankcase causing it to pressurise. This pressure needs to be vented somewhere otherwise it causes seals to blow out, bad oil drainage internal drag which = less efficiency etc etc. In early systems it was just vented to the atmosphere. Nowadays with emissions standards (actually since about the 80's) it's not really environmentally friendly to vent oily vapours into the atmosphere so there are crankcase venting systems in cars that vent the oily vapour back into the intake of the car to get sucked up by the engine and burnt off - makes the hippies somewhat happy (hippies are never completely happy), hippies buy said cars, car manufacturers are happy.

Trouble with your engine sucking in oily air though is that it reduces the effective octane level of your fuel which can = detonation and therefore lower performance. Not a problem on a factory car - can be a problem on a modified car that is closer to the safe limit. People that like going fast don't like this. That and it makes your intake/turbo etc oily and generally scody.

Catch can (depending on design) catches the oily vapor, separates oil/air, vents the air to atmosphere (or back into intake minus the oil) and stores oil in a can that you can drain later. Some drain the oil straight back into the block/sump so it's a completely closed system.

Bit more to it but in a nutshell that's basically it. Some cars have factory catch tanks eg: 93/94+ Turbo MR2

Well put.