Plumbing for oil catch tank, pics please!

[Taiquri]

Originally Posted by willrobdon

Nice work on the welding. That looks very good.

Thanks! Now i need to sort the windscreen washer tank

[GhostWKD]

Holy thread revival... But get shouted at if dont use search first heh

If i'm plumbing in a catch tank this weekend, what size are each of the pipes I need to bung and the outlets on the rockers?

Got a catch tank with 2 fittings - plan is to blank both bits of pipework on the fuel rail (literally cut and then bung?) and then where it currently goes to 2nd turbo, blank the turbo side and instead take the feed into the catch tank, then out of the catch tank to a breather... Think i've read somewhere that the rocker cover fittings are 22mm (is this OD or ID?), but the other ends of the pipes are 14/15mm - is that correct?

Am trying to be prepared and picking up bits to bung pipes with and pipework to get down to 15mm for my catch tank - but failing impressively as cannot confirm the sizes as above

Thanks in advance for any help

[doyle4281]

There is a lot of great information in this thread, and a lot of interesting setups. I too am interested in optimizing the performance and reliability of my engine, and it seems that no component is too small to overlook. One thing I have noticed, based on looking through other RB setups, is that it seems that many people opt to stray greatly from the original design of the PCV system. Judging by the fact that many very credible builders are using similar methods, I am assuming that it works well. To be more specific, it seems that many opt not to use a PCV valve and eliminate the hose to the intake pipe. My experience with crankcase ventilation is limited aside from OEM arrangements. I can understand removing the PCV valve as our ventilation concerns are primarily focused on "on boost" times, which the PCV valve is closed anyway. Aside from environmental issues, I can understand eliminating it. However, eliminating the hose to the intake pipe seems that it would decrease the efficiency of the crankcase ventilation? From what I understand, the vacuum created in that pipe would create a greater differential to create flow through the crankcase. However, sending that junk through our turbo is not the greatest choice either. How much does the crankcase actually become pressurized above atmosphere? And, without a vacuum source can PCV systems be efficient? I have heard of some using the exhaust as a source of vacuum, which seems like an excellent idea, however it seems risky to trust a check valve in case of after-fires. Being an Evolution owner as well, most leave the PCV and intake tube intact, and simply add catch cans to both sides. Any help would be appreciated

PCV system theory and Oil catch cans. - evolutionm.net

[Samwest]

Heres how i plumbed mine!

[doyle4281]

A friend of mine is in the process of installing an electric vacuum pump to his crankcase ventilation system, I will update when I can. It is an Audi S4 racecar, but the concept is the same.

[ianp]

I've bought an ARC can like this with just the one port fitted



My plan is to run it like this?



Any opinions or better suggestions?

[Chris Wilson]

It's supposed to go here, in place of the stock screen washer fluid reservoir.

[ianp]

No shit?

I know where it goes, I was asking about the hoses

[roadrash9r]

Ianp, by your picture, it will not work at all. Your can is vented, and you will be using the port on the rear turbo after the MAF which will act as a vacume leak leaning out the mixture.

In your picture it looks like you are connecting the tank to the PCV port on the valve cover. If you do that you will be sucking clean air into the tank, then through the valve covers and finaly into the rear turbo port as it always has some suction.

In order to do it correctly, you need to cap off the pcv and its port on the valve cover, and put a sealed catch tank in the line going from the exhaust valve cover to the rear turbo intake port.

[nightcrawler]

reviving this thread...

so its better not to delete the pcv then? as i have read on the other thread about pcv delete, that after fitting an oil catch can, the engine will run leaner. does that mean it needs a remap?

[felixy69]

Originally Posted by godzilladom

JUST SEEN THIS!!!!
would this work?

no dont do that....oil will drip out of the filters

[felixy69]

i always wonder if i can hide the catch can on the bottom of the car/engine??? will that ruin the flow?

[jimmy1234]

Originally Posted by TW60

The two above setups are completely useless. By blocking everything off and creating a closed loop setup, you are essentially destroying what the PCV (Positive crankcase ventilation) system is designed to do: Release excess crankcase pressure. A stock rb26 does this by using a vacuum source (the suction pipe) to aid in releasing this pressure.

The problem, is that rb26's move so much oil that some oil makes its way into the pcv system. A catch can fixes this problem, but only when setup correctly. By completely blocking off the system, or by venting to atmosphere, you are impeding the PCV system of functioning the way it was designed. It is necessary to understand that the pcv valve and breather hoses serve a purpose, and it is ideal to keep things working as close to the way they were designed. The nismo kit works very well. It keeps the pcv valve and breathers intact, uses the intake as a vacuum source and has an oil recirc pipe that T's into the rear turbo drain. The only thing that would make this setup perfect IMO would be using the exhaust as a vac source.

I have seen innumerable threads on various forums asking "will this catch can setup work". Odds are, yes, it will 'work'. But if it will be functional is an entirely different question.

suprised noones picked up on this post


thoughts???

[RadoGTST]

That post made me rethink everything again and I never got round fitting my ARC catch tank.
I'm actually thinking about blocking off the vent on it and welding in a return pipe (as per closed catch tanks).
Any thoughts on what TW60 wrote?

[ianp]

Originally Posted by RadoGTST

That post made me rethink everything again and I never got round fitting my ARC catch tank.
I'm actually thinking about blocking off the vent on it and welding in a return pipe (as per closed catch tanks).
Any thoughts on what TW60 wrote?

Thats what I'm doing with mine