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Old 08-12-15, 16:16   #1
TUF:03T
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Catch can setup

What does everyone do for catch can set up, I currently use 2x 5/8 breather hoses out of standard position into 1.5 litre catch can with top k&n breather, then has a drain back which tees into turbo drain to sump, my issue is it still blows enough oil out the breather to make a big mess, can anyone help
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Old 10-12-15, 06:09   #2
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Come on guys some one must have experience with rb30 pumping too much oil to the head
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Old 10-12-15, 06:53   #3
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All I can think of is piston rings or glazed bores mate, either that or your turbo drain pipe is pressurising from a dodgy turbo?

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Old 10-12-15, 19:36   #4
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It is making around 440hp on 22psi so engine is healthy, was thinking maybe to much crankcase pressure making it difficult for oil to get down from head,

Was looking to install -12 line from front end of Tappett cover to sump above oil level?
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Old 10-12-15, 20:19   #5
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I run dual -10 fittings but don't run back to sump, and 5-6 runs at drags my forged motor only blows by 1litre but I run e85 and around 26-27psi
U will always get some blow by but how much do u think is a lot?
R u still on 98pump?
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Old 10-12-15, 21:06   #6
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lol because its making power its healthy? my wagon still smashes tyres at 110kph with a cracked head and low comp in 3 cylinders...... as above you will always get a little oil vapour, but i ran my engine for 6+ years, never emptied the catchcan and it had about 100ml of oil before the head went so i think you have bigger issues.

if you have no blockages in your oil system, your gonna need a bottom end rebuild cos u got some mad blowby.

i would never advise someone to run there catchcan back to the sump either, all your doing is introducing water into your oil through condensation.

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Old 13-12-15, 07:09   #7
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Quote:
Originally Posted by dougall83 View Post
I run dual -10 fittings but don't run back to sump, and 5-6 runs at drags my forged motor only blows by 1litre but I run e85 and around 26-27psi
U will always get some blow by but how much do u think is a lot?
R u still on 98pump?
It's more that it pushes it out of the can, it drains back so I'm unsure, I'm going to block of the drain back and monitor it, it is also on e85
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Old 13-12-15, 08:45   #8
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As psi wagon said I think if ur oil line isn't blocked u have a problem
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Old 13-12-15, 11:55   #9
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I run a small 1L catch can and had problems with oil coming out the catch can. I ended up getting a -12 fitting from rocker cover to sump in the back lower corner of the rocker cover and in the front and then stuck steel wool in the catch can to separate the oil from the air.

Pushing 30psi all day every day, and it's only at the track I get oil in the can - but so far with the big return lines I haven't had any issues.
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Old 13-12-15, 17:02   #10
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I had an engine rebuild (basic) 25,000 km ago.

Both hoses off rocker cover to a breathable catch can.

At the start, I was seeing a litre every 1000km when putting my foot down a lot on high boost (normal driving would see the can close to empty of course).
It has gradually slowed down to around 50-60 ml every 1000km and this is with the same sort of driving.

I have noticed that if I overfill with oil by just a little, I do notice a little more at times.

I plan to get a catch can made and installed this week with dash-10 fittings and then route two hoses from rocker cover to the can.

From a lot of searching online, I see some people have made another hose from can to the intake near the turbo, what are people's thoughts?

Hope that helps tuf03t

---------- Post added 13-12-15 at 17:33 ----------

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I run a small 1L catch can and had problems with oil coming out the catch can. I ended up getting a -12 fitting from rocker cover to sump in the back lower corner of the rocker cover and in the front and then stuck steel wool in the catch can to separate the oil from the air.

Pushing 30psi all day every day, and it's only at the track I get oil in the can - but so far with the big return lines I haven't had any issues.
Hey Morgz, from a lot of searching online, I see that once people go bigger with their hoses, It makes the difference.
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Last edited by calaist5; 13-12-15 at 18:01.
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Old 14-12-15, 11:52   #11
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Yeah the problem is with high RPM and boost the RB30s will pump a lot of oil into the head and you need to get it back down to the sump, otherwise it's all going to flow over into your catch can. People either restrict the oil going into the head, or you make it easier for the oil to drain back to the sump.
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Old 31-12-15, 16:20   #12
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The following pictures are what my mechanic has done.
I am yet to really take it for a long drive.
The only down side I have noticed driving home was, there was a slight whistle sound (no it's not the turbo lol).
I am guessing this is air entering the induction Pipe near the turbo.

What are people's thoughts?

The inside with baffles



Included is a section to make it serviceable (I added some stainless steel wool in the middle) and a tap


This is the induction pipe with a -10 fitting which accommodates outlet from catch can.


---------- Post added 31-12-15 at 16:54 ----------

Finished setup
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Old 05-01-16, 10:55   #13
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That'll work!
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Old 08-02-16, 21:52   #14
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Just clicked 1100kms and haven't lost a drop yet.

Should have went bigger breather hoses from the start.
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Old 09-02-16, 16:49   #15
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Hi TUF:03T.
Can you send us a picture of how you have it setup up.
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Old 12-02-16, 12:21   #16
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you will probably also find that the pressure in the crank case was pushing oil up the drain from the can to the turbo drain.

You would have been better off putting a one way valve on it to stop it from pumping out of the sump.
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Old 03-02-17, 12:47   #17
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From a lot of searching online, I see some people have made another hose from can to the intake near the turbo, what are people's thoughts?

Post earlier from
Calaist5

Also interested in what people have done.

Ive just had my vl calais turbo pump out a heap of oil from the breather filter from the catch can.
Im going to check the return hose for blockages and look into bigger hose size?
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Old 03-02-17, 13:47   #18
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For my situation if you read the past thread, I had problems until I went bigger hoses and made the above can.

I have not used oil since.

Cheers David
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Old 04-02-17, 00:03   #19
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Quote:
Originally Posted by 355VL1 View Post
From a lot of searching online, I see some people have made another hose from can to the intake near the turbo, what are people's thoughts?
I don't like the idea of excess oil going into the front of the turbo.. just makes a mess. I'd say that would be done as an attempt at keeping it all 'closed loop' pcv - ie nothing venting to atmosphere. But oil in your intake will reduce the octane rating when mixed in the cylinder.
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Old 04-02-17, 12:51   #20
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I don't like the idea of excess oil going into the front of the turbo.. just makes a mess. I'd say that would be done as an attempt at keeping it all 'closed loop' pcv - ie nothing venting to atmosphere. But oil in your intake will reduce the octane rating when mixed in the cylinder.
For legality reasons Morgz?

I do see your point though.

Cheers David
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Old 04-02-17, 23:29   #21
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Yeah legally everything has to be plumbed back, ie breathers recirculating back into the engine or intake, nothing venting to atmosphere - mainly important if your needing a rwc, but realistically most people have enough mods that oil breathers are the last of their issues.

But anyone who's done a bit of racing would know how much an engine can breath under heavy load and high rpm - don't want that stuff in your turbo inlet, cooler pipes or inlet.

I just carry a small container when racing and empty the catch can into that after most runs. I lasted approx. 10 runs at Heathcote last time before she sprayed oil all over the engine lol.
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Old 01-06-17, 14:27   #22
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Well it's been 18 months since I even seen the inside of the can.
I pulled the inspection cover off and
I guess there would not have been 20 mls.
Obvisouly it was doing its job as my dipstick reads on full.
Replaced with fresh steel wool.

---------- Post added 01-06-17 at 13:59 ----------

Quote:
Originally Posted by Morgz View Post
Yeah legally everything has to be plumbed back, ie breathers recirculating back into the engine or intake, nothing venting to atmosphere - mainly important if your needing a rwc, but realistically most people have enough mods that oil breathers are the last of their issues.

But anyone who's done a bit of racing would know how much an engine can breath under heavy load and high rpm - don't want that stuff in your turbo inlet, cooler pipes or inlet.

I just carry a small container when racing and empty the catch can into that after most runs. I lasted approx. 10 runs at Heathcote last time before she sprayed oil all over the engine lol.
I understand but I got sick of smelling burning oil and because I'm OCD, I used to hate thinking of all that oil mist in the engine bay lol.
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