Who knows much about them..??
Does anybody have one or used one or even knows much about them..??
Tell me where you got yours from and what you payed for it and how hard it was to install..??

Ive been told i need to run one.. Just dont know much about them at all..

If anyone has got pics id like to see..:)


All The Breast
Jason :)

i doubt u need one, but who knows. at least they look cool.

around $100 from shawn at philcom (for memory). can always give dave a call im sure he would have them on the shelf as well

in my late night confusion i shall give you a bad description

i think they are there to catch oil when the oil pressure gets to much.

in my late night confusion i shall give you a bad description

i think they are there to catch oil when the oil pressure gets to much.
you have oil return lines from your tappet cover back to the manifold. recirculates fumes back into the intake manifold. idea of a catch can is to remove the oily fumes from the intake and puts them into a can which you can empty the oil deposits.

i think . . . . .

yeah mate oil catch cans are very very important for any high performance engine. you know the 2 hoses that come outta ur rocker covers and go into the intake pipe?? well they are part of the crankcase ventilation system. when pressure is built up in the engine and may slip past rings etc, it pressurises the crank case. these 2 pipes allow the pressure to be vented to stop engine damage. they cant be vented to the atmosphere due to emission laws, so they go to ur intake. unfortunately what is vented is vapourised oil... hence why ur t/b and intake manifold build up with greasy sludge. not good for ur engine but better than the alternative... blown engine or gaskets or seals etc...

the catch can is just that a can to catch the oil vapours. you situate it somewhere in the engine bay and run 2 pipes from the rocker covers to the can and have a little breather filter like an air filter on top. the filter on the can needs to be at least the diameter of the sum of the diameters of the 2 pipes. ie. 2x 7mm pipes go in so filter is 14mm inlet diameter.

i am unsure on the size of pipes needed but from memory i think it is 7mm pipes for standard engine and additional 3mm in diameter for every 100hp extra or something... remember having it too small is just as bad as not having one at all the pressure cant escape ur engine...
IMPORTANT: make the outlets in the rocker cover big enough also!

i have one and u can see it on my pic under my name. it is near the battery where the air box would normally be. i made it from pvc pipe with 2 end caps and some brass screw in fittings.

i agree with teh above post all EXCEPT the vent the catch can to the atmosphere, i don't know about anywhere else but in qld ANY aiir that enters the engine via the air filter MUST exit via the exhaust, thus making a atmo vented catch can a major defect in qld and not only can the transport department book you but so can the EPA,


you can buy catch cans off the shelf at any autObarn for around $120,

well that is how they work if people are worried about that aspect then run a pipe somewhere hidden with a filter on the end of it. :D anyway you could beat them on a technicality... the air enters the engine now thru the catch can and circulates and leaves again via the catch can never actually entering thru the air intake pipe or filter.

at ego's level of mods he doesnt really have a choice he could damage his engine if not running one.

Yeah - they are a good idea. Thanks for reminding me, another thing to add to the list of stuff to do to the car.

You can pick up cheapo ones for about $100, they come with crappy looking plastic hoses and crap. When I get around to it - I'll be getting a custom made one. The guy that did my install makes very very very nice catch cans.

a little off topic although i was curious about oil coolers??

Do 3rd gens have a stock oil cooler, im tipping they do, has anyone got an aftermarket oil cooler??

well that is how they work if people are worried about that aspect then run a pipe somewhere hidden with a filter on the end of it. :D anyway you could beat them on a technicality... the air enters the engine now thru the catch can and circulates and leaves again via the catch can never actually entering thru the air intake pipe or filter.

at ego's level of mods he doesnt really have a choice he could damage his engine if not running one.


lol i guess you have never delt with queensland transport,

i never actually said don't get one, i just said do vent it to the atmo, run the hose that exits the can back to the throttle body

lol i guess you have never delt with queensland transport,

i never actually said don't get one, i just said do vent it to the atmo, run the hose that exits the can back to the throttle body

this would actually defeats the purpose of having the catch can as it vents the oil vapours back into the engine. the porblem of crankcase pressurisation becomes more prevalent in older engines and forced induction / nitrous applications... but im pretty sure he'll be running very high compression in that baby by the sounds of it

i doubt u need one, but who knows. at least they look cool.

I do an dim not fused what it looks like.. Ill use a coke can if i can..:P it will be hiden so its not for the looks..:P Id rather not have one but i need it..


yeah mate oil catch cans are very very important for any high performance engine. you know the 2 hoses that come outta ur rocker covers and go into the intake pipe?? well they are part of the crankcase ventilation system. when pressure is built up in the engine and may slip past rings etc, it pressurises the crank case. these 2 pipes allow the pressure to be vented to stop engine damage. they cant be vented to the atmosphere due to emission laws, so they go to ur intake. unfortunately what is vented is vapourised oil... hence why ur t/b and intake manifold build up with greasy sludge. not good for ur engine but better than the alternative... blown engine or gaskets or seals etc...

the catch can is just that a can to catch the oil vapours. you situate it somewhere in the engine bay and run 2 pipes from the rocker covers to the can and have a little breather filter like an air filter on top. the filter on the can needs to be at least the diameter of the sum of the diameters of the 2 pipes. ie. 2x 7mm pipes go in so filter is 14mm inlet diameter.

i am unsure on the size of pipes needed but from memory i think it is 7mm pipes for standard engine and additional 3mm in diameter for every 100hp extra or something... remember having it too small is just as bad as not having one at all the pressure cant escape ur engine...
IMPORTANT: make the outlets in the rocker cover big enough also!

i have one and u can see it on my pic under my name. it is near the battery where the air box would normally be. i made it from pvc pipe with 2 end caps and some brass screw in fittings.

Yeah.. the issue i got is when we removed the plenium yesterday there is a lot of oil and in the intake manifold.. enough to create run marks in the muck and have to do something about it.. I need it, its not an i want thing..:P

Use steel wool inside the catch can (a DIY one) to catch the oil:D

this would actually defeats the purpose of having the catch can as it vents the oil vapours back into the engine. the porblem of crankcase pressurisation becomes more prevalent in older engines and forced induction / nitrous applications... but im pretty sure he'll be running very high compression in that baby by the sounds of it



i beg to differ, you have a look at most catch cans and the don't have anywhere for venting to the atmosphere, the hose runs from the postive crankcase valve throught the oil catch can and to the throttle body,


if your just venting it to the atmosphere why not just pull the hose of your inlet and throw a filter on the end would be cheaper

i beg to differ, you have a look at most catch cans and the don't have anywhere for venting to the atmosphere, the hose runs from the postive crankcase valve throught the oil catch can and to the throttle body,


if your just venting it to the atmosphere why not just pull the hose of your inlet and throw a filter on the end would be cheaper

Actually you can buy air filters for them now
They look like mini pods that you whack straight on the end of the PCV (im sure this is how it works)
Ive never seen them before so they are new to me but they might of been out for ages

The reason why the gasses are also passed through to the throttle bodyinstead of just being vented to the atmosphere, is because they are extremely toxic and produce a lot of pollution.

All you need to do is place the catch can inline with the current pcv (positive crankshaft ventilation) valve and the throttle body. Once the air has been passed through the catch can there will be a low level of suspended oil in there. There's no point in venting to the atmosphere when it can be put through the engine and cleaned up. Also by running it through the engine you won't be breaking the law so you don't need to worry.

They usually run baffles in them and this is how the oil is collected, although using steel wool as Tuff suggested, works as well.

The reason why the gasses are also passed through to the throttle bodyinstead of just being vented to the atmosphere, is because they are extremely toxic and produce a lot of pollution.

All you need to do is place the catch can inline with the current pcv (positive crankshaft ventilation) valve and the throttle body. Once the air has been passed through the catch can there will be a low level of suspended oil in there. There's no point in venting to the atmosphere when it can be put through the engine and cleaned up. Also by running it through the engine you won't be breaking the law so you don't need to worry.

They usually run baffles in them and this is how the oil is collected, although using steel wool as Tuff suggested, works as well.


shhh your meant to tell them it's the little magic man inside the can that catches the oil droplets and put them in the little bit at the bottom, lol


yes you can buy "little pods" that vent to the atmo they were used on old V8's back when old fart was born :bowrofl: and when there was no concern about teh ozone layer and the epa were not all uptight lil *****s,

The reason why the gasses are also passed through to the throttle bodyinstead of just being vented to the atmosphere, is because they are extremely toxic and produce a lot of pollution.

All you need to do is place the catch can inline with the current pcv (positive crankshaft ventilation) valve and the throttle body. Once the air has been passed through the catch can there will be a low level of suspended oil in there. There's no point in venting to the atmosphere when it can be put through the engine and cleaned up. Also by running it through the engine you won't be breaking the law so you don't need to worry.

They usually run baffles in them and this is how the oil is collected, although using steel wool as Tuff suggested, works as well.


Yeah thats what we are gunna do.. i remember the PCV thing..:P

here u go this is how its done on a 3rd gen.....note dont use this type of hose use the heavy duty hose with a 20psi markin on it

hey thats my engine bay haha

oh yeh. u need to get better hoses then wat it comes with. i just never got around to changing mine but once i get the new engine in then i'll put some nice stuff on it

i think dave from rpw has two in his car.

here u go this is how its done on a 3rd gen.....note dont use this type of hose use the heavy duty hose with a 20psi markin on it

Actually - If you are going to do it, then this isn't a very good example (no offence Meh). In this case - it is only hooked up to the PCV on the front crank case - meaning the rear crank case is still venting unfiltered crap back into the engine.

You can still run a single catch can, you will just need to make sure both PCV valves are plumbed together before the catch can - then split after it back into the two different inlets.

Actually - If you are going to do it, then this isn't a very good example (no offence Meh). In this case - it is only hooked up to the PCV on the front crank case - meaning the rear crank case is still venting unfiltered crap back into the engine.

You can still run a single catch can, you will just need to make sure both PCV valves are plumbed together before the catch can - then split after it back into the two different inlets.

I thought You only had ONE PCV Valve at the front? And at the rear it just goes back into the rocker cover?

Actually - If you are going to do it, then this isn't a very good example (no offence Meh). In this case - it is only hooked up to the PCV on the front crank case - meaning the rear crank case is still venting unfiltered crap back into the engine.

You can still run a single catch can, you will just need to make sure both PCV valves are plumbed together before the catch can - then split after it back into the two different inlets.

yep i know :D
i just havnt been bothered to do it all properly yet.
i also seen on the ripp mods website they include a heavy duty pcv valve in their kits

I've got one... $20 home made.. :D

Uhh.. Doesn't having a catchcan venting to the atmosphere make it illegal and also get nice hot oil mist spraying around your engine bay?? Hmmm, say hello FIRE.

Get an unvented baffled catch can if you want to be hardcore.

And it stinks.

Don't waste your time, they arn't needed for even the most hardcore street car.

hey thats my engine bay haha



thats correct, cant find n e pics that has it attached as a samplelol

And it stinks.

Don't waste your time, they arn't needed for even the most hardcore street car.


When your intake is getting that much oil through it it is neeeded.. I dont want to put one on but we need too..:(

Supposedly the oil vapours reduce the octane of the fuel(?) and can lead to pinging, and fouling around the valves...

An older engine with a bit of blow-by probably could do with one...

Cheers
Heath Young

and also one with high compression whether natural or boosted compression

Ok, I'm looking at getting a catch can myself as the intake etc is a bit oily (too much high revving? hehe)

Anyway, its there a way to clean the TB and plenum with only taking the air intake off? Like spray or something? I know its written on this forum but it doesn't say whether you need to dismantle it or not... lol

Take off the intake at the TB and spray some carby cleaner all over the inside of it (TB), opening the butterfly and getting it everywhere! Then replace inlet hose and start her up. Make sure you replace the inlet piping coz these engines dont like to run with out the AFM doing its job, plus unfiltered air is all bad!

Ok, I'm looking at getting a catch can myself as the intake etc is a bit oily (too much high revving? hehe)

Anyway, its there a way to clean the TB and plenum with only taking the air intake off? Like spray or something? I know its written on this forum but it doesn't say whether you need to dismantle it or not... lol

Go down to your local mechanic and ask for a "carbon blast" will take about 30 - 40 mins all up. They hook a bottle of solvent up to one of the vacuum lines into the intake, then let it sit for 25 minutes then start the car and rev the tits off it and it will blow out enough white smoke to stop traffic if the wind is blowing the right way.

Its the only way to remove all the crap from the tops of your valves............ which is where it really matters. The thin coating of gunk on the inside of the T/B and plennum isn't really a problem.

Its the only way to remove all the crap from the tops of your valves....

....apart from taking them out :cool:

hey, cool thanks :) I'll give the carby cleaner a go, and after I get the oil catch can set up I'll look at getting the vacuum method done!

What would happen if I sprayed the carby cleaner into the vacuum line while I hand throttle it? lol

What would happen if I sprayed the carby cleaner into the vacuum line while I hand throttle it? lol

It's not what it's designed for. Whatever the active ingredient in carby cleaner is - it evaporates very quickly, meaning it probably wouln't even make it to your valves.

It's not what it's designed for. Whatever the active ingredient in carby cleaner is - it evaporates very quickly, meaning it probably wouln't even make it to your valves.
Yeah it's some sort of hydrocarbon or alcohol, and it evaporates flat out.

It's not what it's designed for. Whatever the active ingredient in carby cleaner is - it evaporates very quickly, meaning it probably wouln't even make it to your valves.

it might make it down there. But if you've used brake cleaner before you'll see its basically the same thing but evaporates in seconds compared to carby cleaner.

ego think about an oil separator instead of a catch can. more expensive but it uses interior baffles and crap (i forgot how it works ok) and in the end of a spirited punt your car doesnt smell like an oil fire.

ego think about an oil separator instead of a catch can. more expensive but it uses interior baffles and crap (i forgot how it works ok) and in the end of a spirited punt your car doesnt smell like an oil fire.


Interesting.. never heard of these things..:)

**Goes and uses google search**..:P

ego think about an oil separator instead of a catch can. more expensive but it uses interior baffles and crap (i forgot how it works ok) and in the end of a spirited punt your car doesnt smell like an oil fire.

Basically all it is, is a catch can which isnt vented to the atmosphere; containing baffles (steel plates, mesh, etc... ), just a maze for the air flow... so the oil is more or less separated from the air and flows down to the bottom of the canister. Of course they arent as effective as an actual vented catch can but they still do a great job. I'm running mine in series with the original pcv line, without any baffles and its amazing the amount of oil it catches... can't believe that much crap would be otherwise burnt or gooing up my intake runners.