Jump to content
SAU Community

Recommended Posts

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.

Link to comment
https://www.sau.com.au/forums/topic/104939-catch-can-how-much-oil-is-collected/
Share on other sites

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.

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 by bluefire

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

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.

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.

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.

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 by Guilt-Toy

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

post-1179-1139384010.jpg

Edited by MearCat

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • The cross sectional area of a circular hole scales with the square of diameter. So a 2mm diameter hole is 4x the area of a 1mm hole. Not double. The 1.7mm hole is nearly 3x the area of a 1mm hole. You do not need restrictors at both ends of the oil supply line. If you have new, additional restrictors at the turbo end, that you did not have before, then you do not need a restrictor at the inlet end.
    • Hi all. Been a while but things are moving along. I just have something that I am wondering about. Since I will use OEM turbo oil pumbing, I got myself a new bolt, the one that goes into the engine block oil feed. As I recall (and see visually) this bolt comes restricted with I think a 1.7mm hole? Not quite sure but it was something around that size. The turbos have 1mm restrictor bolts installed, as necessary due to ball bearings and my higher oil pressures. Can I now just use that OEM bolt with the 1.7mm hole in for the engine block or will this actually be too much oil flow restriction and I have to drill it out first? In my head it would make sense for the bolt to be at least 2mm wide as both turbos take "1mm of oil flow". Do let me know if my logic is flawed here, I just want to make sure I don't kill my turbo bearings with too little oil. Don't know if I can trust the saying I read somewhere that ball bearing turbos essentially only need an oil mist
    • There are several aftermarket options available, from not-too-painful moneyhttps://justjap.com/collections/driveshafts-bearings/products/d-max-reinforced-replacement-rear-driveshaft-set-fits-nissan-s13-s14-s15-r32-r33-r34-c35 and  https://justjap.com/products/crank-motorsport-billet-rear-axles-fits-nissan-skyline-r33-gts-t-r34-gt-t?srsltid=AfmBOorQk4xkGUa98kO7v2ePLUiNt-HRrM2AwWNw9mbSIVE1ujBVwY__, all the way up to The Driveshaft Shop https://driveshaftshop.com/skyline-cv-axles/
    • Yeah based on old XRC5964S specs, it looks to be roughly GTX3576R sized? But this 5964S compressor will flow 90lb airflow somewhat similar to the compressors in both the GTX3584RS or G35-1050.. I fully expected the 0.64 rear A/R to choke up top - seems way too small from typical convention - but these are seemingly beneficial over the prior 0.82 results.. Be interesting to see if he comments on the EFR question in that thread - he mentioned in a prior video that BW EFR's were the "cats pajamas 10 years ago", but by the sounds of things all his kits have been using Xona for quite a while now.
    • Yeah it’s still got the oem manual gearbox and clutch, only kinda mods are a blow off valve, coil overs, and a aftermarket intercooler. Also had it for about 2 months now with a lovely midnight purple paint on it.
×
×
  • Create New...