Rb26 Blowing Oil In Catchcan

[DVS JEZ]

Looks good but i really dislike the fitting method of having to take off one of the oil returns from under the turbo.

[N1GTR]

Yeah mate around that money, surely someone could make that exact thing up here locally for stuff all though

[djr81]

If its not connected to the turbo intake (which he said it isnt) then it cant find its way to the intercooler unless a turbo seal is leaking

If the Nismo catch can is connected to the turbo inlet as designed the oil goes there & finds its way into the intercooler. If it is vented to atmosphere then it will just make a mess of the engine bay like most cans do.

Point is it is at best a bandaid fix. It will knock down some oil & return it but there should not be half a litre there in the first place.

[Mark-32]

Sorry to bring back this topic, but after speaking to a tuner today that knows a fair bit of oil control issues in rb's, and also runs a nitto pump in his race car, i just had a few other questions relating to the nismo style oil / air seperators and oil return.

Seeings have my external oil drain from the head plumbed into the driverside of the sump. My tuner said this would be flowing minimal oil down it once tthe head is full of oil due to the way the crank rotates and oil could possibly be blowing up that pipe into the head when pulling high revs for a while.

Just have a few questions about my setup if anyone can fill me in. Regarding the nismo style catch can that was pictured, do the rocker cover breather pipes run into the cylinder on each side, then the lower outlet pipe acts a return and just drains back into the engine via the rear turbo oil drain on the side of a block?.

Also, will I still need to fit the mines style rocker baffles to the engine?

Will another pipe coming off the oil/air seperator then run into a larger normal style catch-can that vents to atmo and that has a return line from the catch can that T's into my current oil drain from the head into the driversside of the sump?

Sorry for all the questions just wanted to understand how that setup works and know others thoughts so I can solve this issue permanenttly without pulling the head off again. Not keen to buy things if its just overkill.

[trick]

hey mark.

actually have the same issues with a mates car.

having to take the head off and reduce the oil restrictor down to 1.0mm, pain in the arse i know but the engine was coming out anyway

in regards to the nismo catch can i have one installed in my 34 gtr, i have -5's too and 1.4bar of boost and i have no oil problems and am running a n1 oil pump but not sure on the restrictor size, i didnt build the engine

any way the nismo catch can will drain the oil away perfectly but it depends how much oil your getting in the head, if its filling the head quickly and you blow smoke staright away i think the head needs to come off a catch can wont fix that

but if its only after a track day and continous high revs then it blows smoke a nismo catch can might do the trick

the nismo catch can drains with the turbo drain, included in the kit is a Y piece, not too hard to fit, easier than taking the head off anyway

mike

[BoostdR]

It has a 1.2 restrictor fitted. And we also removed the spring in the oil pump to lower the oil pressure. I just thought with all of this done as reccomended here in the rb oil guide section that everything would be sweet. I thought wrong

Tomei oil restrictors are 1.5mm. You can't measure them accurately with a vernier, best to use a drill bit.

What oil pressure max does it have now?

[Ziller]

Its running to atmosphere and it actualy blew a fair bit of oily vapor out the actual filter attached to the catch can.

Had a similar problem, I had a brand new built engine with all the goodies, tomei pump, restrictor, oil drain back, catch can, etc etc....

Tried many things to amend, long story cut short, piston to bore clearance was out and not within range due to poor machining when being bored and honed, this caused a build up of crank case pressure.

The fix, new workshop rebuilt the engine properly (Nizpro) removed the oil drain back system and tossed it in the bin, none of this other mumbo jumbo.

Problem gone!!!

[Mark-32]

How much for the autech cans?

[Mark-32]

hey mark.

actually have the same issues with a mates car.

having to take the head off and reduce the oil restrictor down to 1.0mm, pain in the arse i know but the engine was coming out anyway

in regards to the nismo catch can i have one installed in my 34 gtr, i have -5's too and 1.4bar of boost and i have no oil problems and am running a n1 oil pump but not sure on the restrictor size, i didnt build the engine

any way the nismo catch can will drain the oil away perfectly but it depends how much oil your getting in the head, if its filling the head quickly and you blow smoke staright away i think the head needs to come off a catch can wont fix that

but if its only after a track day and continous high revs then it blows smoke a nismo catch can might do the trick

the nismo catch can drains with the turbo drain, included in the kit is a Y piece, not too hard to fit, easier than taking the head off anyway

mike

Hi mate, my engine only blew oil into the catch can after doing 2 full laps at WOT around a circuit that took 1min roughly per lap.

So its not all that bad,

Im entering the car in a drift day next weekend but im going to fit mines style rocker baffles and hope for the best.

Im just hoping that because drifting is not constant WOT lap after lap it may give the oil enough time to return to the sump on the half lap of cruising back to the start line!

[Mark-32]

My mines rocker baffles turned up today, but I have one last question If anyone can help me try solve my oil issues before I take my car to the track again on the weekend.

As I stated earlier, my external oil drain hose runs from the rear of the head to the driverside of my sump. I know its on the wrong side of the engine but I didnt realise I had it wrong until it was too late.

Anyway....My question is- if the car still blows oil into the can after I install the baffles, could I cut my oil return line low down near where it bolts to the sump and fit a T-peice in line into the hose, then run out of the t-peice up to my catch can and use this as an oil return from my catch can?

Or because its on the wrong side of the sump to begin with will this cause the crankcase pressure to exit via my catch-can and not the head and possibly make matters worse by breathing heavily into the catch can?

Hopefully the mines baffles fix the problem but any other help or advise is much appreciated, I've thrown a few dollars on the drift day coming up on the weekend and really dont want the oil issues to wreck my day.

[N1GTR]

Yes do that

[O2 Autosports]

whats your rev limit?

[BoostdR]

My mines rocker baffles turned up today, but I have one last question If anyone can help me try solve my oil issues before I take my car to the track again on the weekend.

As I stated earlier, my external oil drain hose runs from the rear of the head to the driverside of my sump. I know its on the wrong side of the engine but I didnt realise I had it wrong until it was too late.

Anyway....My question is- if the car still blows oil into the can after I install the baffles, could I cut my oil return line low down near where it bolts to the sump and fit a T-peice in line into the hose, then run out of the t-peice up to my catch can and use this as an oil return from my catch can?

Or because its on the wrong side of the sump to begin with will this cause the crankcase pressure to exit via my catch-can and not the head and possibly make matters worse by breathing heavily into the catch can?

Hopefully the mines baffles fix the problem but any other help or advise is much appreciated, I've thrown a few dollars on the drift day coming up on the weekend and really dont want the oil issues to wreck my day.

You can make the problem worse with the mines baffles as they do not allow much drain back once oil gets into the baffles. In the instructions it lists to put silicon half way up the internal runner. I would leave it as is so oil can drain back. Also leave a gap in the foam to allow the oil to fall.

matt

[Mark-32]

So I fitted the mines baffles friday night hoping to fix my issues and took the car to a drift day on saturday only to have the same problems.

After doing two laps in the car my fuel pump shorted out due to a broken fuel tank baffle, then after finally fixing that problem I took the car out to try again.

To start with the car was blowing alot of white smoke out the exhaust on idle and acceleration, It had never done this before and I have no idea why it happend as my catch can is vented to atmo.

Then after the smoke cleared, I did another lap at high revs in 3rd gear and then came into the pitts to find the catch can full of oil,

Can anyone fill me in on exactly where I go next with this?

Like what size restrictor I need to be using, as obviously the head is going to have to come off yet again,

And also why the car would have been blowing the smoke like it did. Im confident the piston to bore clearance is right but im also really hoping its not due to oil passing past the rings as i spent a shitload doing the rebuild and had it done by a highly reccomended workshop in vic with heaps of RB experience.

From my understanding the only way oil can enter the exhaust is from the combustion chamber?

[BoostdR]

I have just installed a 1.1mm restrictor from hioctanedirect also fitted my pump with STD springs as my reinmax pump springs were .1mm thicker. It was also running just under 8bar max. I would rather around 6.

I have also had the white smoke. Seems to get past the valve stems every now and then. Mine does it when it has been hot, sits for a bit then restated. Totally clears up after 10min or so. Only happens when the head has been full of oil.

[T04GTR]

nismo oil air seperator with your catch can. nothing else will work.

[Mark-32]

nismo oil air seperator with your catch can. nothing else will work.

So the oil air seperator and nothing else????

Surely if i did that alone its not actualy fixing the problem of the head being overly full of oil though?

[Mark-32]

nismo oil air seperator with your catch can. nothing else will work.

Is it a bad thing having that much oil running around in the head and rocker covers full to the top, the head would have to hold 3-4 litres of oil so that would still leave 7 litres in the sump?

Im only asking as really dont want to pull the head off it again, but also dont want to get it if its a band-aid fix sort of thing.

[BoostdR]

I tried everything. I have a nismo can, also installed a breather from the dipstick to the oil cap. I found that when it spits it out it comes in a large quantity, faster than it t

Drains back to the sump from my can. Only way to get it to work I found was to run a scavenger pump from the can to force the oil back into the sump. All of which is not optimal.

As I said before.

1.1mm restrictor

Reduced oil pressure

Installed head drain to front passenger side of sump.

If I still have the issue slightly I will install my boost pressure activated scavenger pump in the head drain line.

Matt

[Shane_954]

I assume you've been chatting to brad about his 25? He has 3 catch cans in series, and two of them have scavenger pumps. Thats seeing consistent 8600 and doesnt have anymore issues.