Rb26 Oil Control On Circuits

[R32 Stuart]

Hi All

You's are going about this the wrong way, not being a smart arse, but many have solved their issues with our vent modification - oil flow / pressure restrictors, extra drains back to sump, mines baffles all helps but doesn't fix the problem.

We put pictures and set up on 3 years ago as to what we run on the R32 with standard sump and the R33 with extended sump - both cars have been doing track work for 4 years including Aussie Supersprints, Hillclimbs, World Time Attack and sports sedan racing, Bathurst Regularity and Irace, not a single oil issue on AO50's or slicks.

Prior to changes both cars would fill a 2 and a half to 3ltr catch can in 2 x 40 second hillclimb runs.

See picture attached of R33, vent system - the trick is to let the engine breathe without pushing the oil out - you will not stop any engine from breathing under power, the slower the air flow the less oil it will push out, with R26's they fill the back of the tapet covers up and thats where the vents are and they have no choice but to pump the oil out.

The front vent halves the air flow / breathing, and example under acceleration if rear vents are submerged front works fine - vise versa - the only thing you can't see from catch can behind headlight - R33 has drain back to sump with a light earles one way valve and a splash plate over cam's under oil filler cap

PM if you need any more info

Cheers

[The Bogan]

Mine has 25 covers with another 2 extra baffled fittings installed at the rear, like a 26 cover, didn't fix my problems though, the oil air separator above the motor may be doing the hard work maybe ?

[sav man]

I can't find any pics of our 33, so i'll do it from memory.

The divers side PCV valve is hooked to the drivers side cover (as per factory)

Other drivers side cover goes to a oil air separator on passenger tower

Separator has a drain to sump, and a big port at the top that goes to a big catch can.

one passengers side cover goes to the big catch can, and I can remember where the other port goes.

I'll keep looking for pics

[djr81]

I don't think many of them do the speed series events but plenty of the AL guys are in high hp gtr's that get punted regularly at no limits events etc. The thing they all seem to have in common is xspeed so they must have there head around the problem.

I had a look at the five R's at the last round of the SES - Wanneroo last year. There was five cars and five different catch can set ups and five differing states of engine newness. But none of them had issues - then again none of them had the big oil pumps.....

Don't really know any of the cool kids over at Antilag and havent been to a no limits thing in years.

Cheers for the tip I'll have a scratch around to see who may have what.

I can't find any pics of our 33, so i'll do it from memory.

The divers side PCV valve is hooked to the drivers side cover (as per factory)

Other drivers side cover goes to a oil air separator on passenger tower

Separator has a drain to sump, and a big port at the top that goes to a big catch can.

one passengers side cover goes to the big catch can, and I can remember where the other port goes.

I'll keep looking for pics

Cheers. Sounds a bit like a Nismo separator plus catch can. I have the Nismo bit atleast.

[Strik3r]

What Stuart said is dead on the money. The solution is all about providing an avenue for the engine to breathe where it doesn't have to push oil out with it. I am in the process of pretty much duplicating the setup he has -> I only wish I'd read about it rather than having to come up with the answer after 3 years of cleaning oil out of my engine bay.

One other thing - the one way valve on the drain from the catch can to the sump is a MUST. Otherwise the oil gets forced up the drain and will fill your secondary catch can.

[The Bogan]

One other thing - the one way valve on the drain from the catch can to the sump is a MUST. Otherwise the oil gets forced up the drain and will fill your secondary catch can.

Is this so even if the drain goes to the hot side of the sump, this one way valve is something I havent looked at, is it a EARLS or SPEED FLOW product ?

And where do I get one ?

[DCIEVE]

Try Gav - he's a regular poster on here and from memory is running a trust pump.

[R32 Stuart]

Is this so even if the drain goes to the hot side of the sump, this one way valve is something I havent looked at, is it a EARLS or SPEED FLOW product ?

And where do I get one ?

Hi Mark

You owe me a rum one day - couple of pics attached - had to jack car up and lay on my back to get this photo lol

Our one way valve is definitely Earls (sorry no part #'s) if you cant' find PM me - this was only added to R33 as precaution to vent system as sometimes ran slicks - EC sub 1.39's / 1.40's on AO50's & 1.01's Wakefield Park - Note - this is Nitto Oil pump - consistently runs 4 bar plus

The ugly pic is the prototype on K''s R32 - that runs consistent 1.03's Wakefield Park AO50's // 1.44's at EC - please note this system used to have catch can pump back to sump (electric) - but has been disgarded for 3 years has no oil return to sump from catch can (after a day at Wakefield from catch can drain - we might get 10 drops of oil - 15 drops of water)

80,000km N1 spec engine - no issues whatsoever. Note - no head oil restrictors whatsoever - runs 3 plus bar - full factory engine head has not been off this engine. R32 is daily driver, R33 is registered but caged

For the last 7 years we have used Nulon Synthetic 20W- 50W in both engines - no issues.

Enjoy

[The Bogan]

Thanks for the pics, rang about the one way valve yesterday, they say it needs 3 psi to open, which would mean the can wouldn't ever return the oil from the can to the sump as I don't think the weight of the oil would be enough to open the valve.

I'm looking at a air oil separator above the cam covers prior to the can now.

NISMO make one apparently.

[DCIEVE]

Unique autosports do one as well, identical to Stuarts first pic.

[sav man]

Thanks for the pics, rang about the one way valve yesterday, they say it needs 3 psi to open, which would mean the can wouldn't ever return the oil from the can to the sump as I don't think the weight of the oil would be enough to open the valve.

I'm looking at a air oil separator above the cam covers prior to the can now.

NISMO make one apparently.

Pull the spring out of the one way valve. I did that on mine, and my tuner does it on his cars. The valve still stops oil getting out of the sump

[The Bogan]

Ah, OK, problem for now seem that they only do -8 and my return is -12, Ill have to do some more hunting it seems.

Thanks for the info

[The Bogan]

[GTR81]

Hi Mark

You owe me a rum one day - couple of pics attached - had to jack car up and lay on my back to get this photo lol

Our one way valve is definitely Earls (sorry no part #'s) if you cant' find PM me - this was only added to R33 as precaution to vent system as sometimes ran slicks - EC sub 1.39's / 1.40's on AO50's & 1.01's Wakefield Park - Note - this is Nitto Oil pump - consistently runs 4 bar plus

The ugly pic is the prototype on K''s R32 - that runs consistent 1.03's Wakefield Park AO50's // 1.44's at EC - please note this system used to have catch can pump back to sump (electric) - but has been disgarded for 3 years has no oil return to sump from catch can (after a day at Wakefield from catch can drain - we might get 10 drops of oil - 15 drops of water)

80,000km N1 spec engine - no issues whatsoever. Note - no head oil restrictors whatsoever - runs 3 plus bar - full factory engine head has not been off this engine. R32 is daily driver, R33 is registered but caged

For the last 7 years we have used Nulon Synthetic 20W- 50W in both engines - no issues.

Enjoy

Would it be better to put the oil return fitting a bit higher on the sump ( about where the hole for the dip stick is on the standard sump baffle tray ) so there less chance

of it pushing oil up there. Or at the back of the sump on the drivers side so it's away from the oil in the sump or is it not that simple?

[The Bogan]

"Ive been told" to put it on the hot side as the spinning crank produces a low pressure zone on that side of the sump, where as the cold side has a high pressure zone.

Pics of mine

[r33_racer]

If the drivers side of the crankcase can breathe adequately and your blowby/leakdown isnt shit house then you wont have the oil control issues.

20% leakdown is rebuild time for a performance engine. Might be close to acceptable for a stock street car....no way is it even remotely acceptable for a high powered street/race car. Leakdown should be less then 5% after a refresh/rebuild or even lower.

If you have high leakdown and consequently alot of blow by then you wont ever cure the oil filling your catch can issue.

I will post my mspaint drawing again...

[eXquiSit]

hi stuart

just wondering, for the setup of the r32, does it drain back to the sump from the catch can also?

are all the catch cans non-vented?

thanks!

=)

Hi Mark

You owe me a rum one day - couple of pics attached - had to jack car up and lay on my back to get this photo lol

Our one way valve is definitely Earls (sorry no part #'s) if you cant' find PM me - this was only added to R33 as precaution to vent system as sometimes ran slicks - EC sub 1.39's / 1.40's on AO50's & 1.01's Wakefield Park - Note - this is Nitto Oil pump - consistently runs 4 bar plus

The ugly pic is the prototype on K''s R32 - that runs consistent 1.03's Wakefield Park AO50's // 1.44's at EC - please note this system used to have catch can pump back to sump (electric) - but has been disgarded for 3 years has no oil return to sump from catch can (after a day at Wakefield from catch can drain - we might get 10 drops of oil - 15 drops of water)

80,000km N1 spec engine - no issues whatsoever. Note - no head oil restrictors whatsoever - runs 3 plus bar - full factory engine head has not been off this engine. R32 is daily driver, R33 is registered but caged

For the last 7 years we have used Nulon Synthetic 20W- 50W in both engines - no issues.

Enjoy

[iplen]

As Stuarts example shows there are very simple ways around this problem. My answer was the "Autech style" catch can from Just Jap, with an extra return welded into the front (at the very bottom) which goes to fitting in the top of the oil filler cap. After a hill climb without this setup the car was pretty smokey, having clearly pumped a lot of oil into the cooler etc. After a pretty hard day at Goulburn the inlet is pristine, and it has not used a drop..

I know this is one car and one day, but does it need to be any more complicated than that??

[eXquiSit]

iplen: do you have a hose which drains back?

or pretty much same setup as stuarts?

[iplen]

Just like Stuart's, that was who I talked to prior to setting mine up, the only return is the one running through the oil cap.