Catch Can - How Much Oil Is Collected?

[MearCat]

I was thinking about making a catch can at home instead of buying one. Most of the catch cans you can buy are quite large and could easily fit 0.5 - 1.0 Litres of oil in them.

For those of you with a catch can, I was wondering how much oil is actually collected/drained from the can, and how often. Please provide your engine type, kms the engine has done and power output to get a gauge on how big I should make the can for my car.

[Snowman]

For reference I have a stock RB26 (bottom end) - making about 325rwkw's and every time I go out onto the track for a 3 lap sprint I have to drain about 1.5L of oil out of my catch can.

But my car is pretty excessive in this front.

[nugget400hp]

lol, u need a rebuild if your going through that much man

[R31Nismoid]

He's well aware of the one

[bluefire]

The amount oil coming out will depend on the condition of the motor and the amount of boost your running. As rings wear out they allow more blowby. Raising boost will also create more blowby. for example my RB25 with about 40km with stock boost does not blow out a single drop of oil. Our shop race car s13 sr20 with 1.4 bar boost, blows out about a quart of oil after about 2-3 laps. we had to plumb a drain tube from the bottom of the catchcan to the turbo oil return hose so that we didn't starve the motor of oil.

-Bluefire

Edited February 8, 2006 by bluefire

[R31Nismoid]

In an RB it has more to do with just "worn" rings etc.

SR's and RB's cant be compared in this topic.

RB's have a large problem here even if they are totally healthy in the motor side of things

[MearCat]

I'm not concerned with anybody who races their cars. I'm only really interested in daily driver cars and how much a stock or lightly modified RB would blow. Does the average Jo that uses their car for a run to work and back each day with the occasional spriited drive really need an catch can that can hold 1 Litre of oil. I think not.

[paulr33]

You should perhaps look into the reason you require a catch can, if you need one then most likely something is leaking, such as the turbo seal as you are getting oil in the intake piping. You may as well just fix the turbo seal rather than making a fix for the oil in the intake for a normal street car if that makes sense.

[MearCat]

My car only has 21,00km on it so it doesn't get any really noticable oil blow-by (nor leaking seals), but I want to prevent oil coating my intake piping now and in the future. IMO a catch can would be useful to gauge whether any seals DO start leaking in the future.

[Guilt-Toy]

I was going to ask this myself. I dont get anywhere near as much as 1 litre but sometimes if i really gas it.. I can get 200mls of oil in the bottle i rigged up. got a oil catch can and im going to run it back to the sump and into the intake as well.

Sydkid told me that any high performance engine needs a catch can. I got away with having one till 220rwkw and he said i shoulda needed one for that much power even...

So yeah now i got a gt3540 running low boost and it does bow oil when i give it heaps.

Edited February 8, 2006 by Guilt-Toy

[inissane]

i have a mild rb20 and there is bugger all blowby to the catch can running ~12psi even when thrashing hard

[MearCat]

I was actually considering using a fuel filter/water trap that diesel engines use (See pic). This can hold about 100mL but you can get bigger ones. Only costs about $35 too

Edited February 8, 2006 by MearCat

[gt-t_r34]

in my r32 rb20 runs .8bar in about 4-6 months i have about 250mls in mine