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Not really because its unavoiable to stop swarf entering the sump when drilling the hole for the fitting. I doubt a one way valve is needed but if you want to fit one it shouldnt hurt. The other place you could use is the external oil returns from the head and the turbo (Although I have read on here that its not ideal)

The fittings are easy to get, I have some sitting infront of me right now. I use PSI Parts (from this forum) and www.vpw.com.au They are generally dearer than the catch can itself.

Edited by MintR33
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i had mine tapped into my oil return off my turbo

that would be the best way to do it. even weld a hose onto the turbo drain pipe and T it off there. you could also get a T piece made and connect that to the rubber piece that goes from the turbo drain to the block.

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I guess you could plumb it into the turbo drain if you use a one way valve. Heres what SK says

You can have a return (drain) to the sump form the catch can if you like. Don't T it into the turbo oil return as it is under a bit of pressure and the oil can run up into the catch can.

:D

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I personally wouldn't T' it in to the turbo's oil drain.

If you are not concerned with emissions (which I presume your not as chances are you have a larger turbo, injectors etc) hide the catch can under the exhaust manifold, shove a little filter on top and run a separate 3/4" hose to the sump.

The biggest advantage of doing this is the sump is now venting to atmo so there's considerably less pressure if any within the sump, power increases 'slightly' and oil is able to drain from the head back to the sump considerably quicker.

We all know RB's tend to throw a lot of oil in to the head, that oil then struggles to return to the sump.

Remove the sump pressure and it greatly aids oil return from the head.

I personally am a fan of 'slightly' restricting oil to the head combined with venting the sump.

Do it once do it properly. :(

Edited by TheRogue
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im in the same boat, i have a rear of head mod to sump, and now a catch can which will be plumbed into the sump.....\

do i need to have a filter on the line form the can to the sump??? can i make it a straight line and be vented to atmo??? will it affect anything with the oil??

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i have a dash 10 screw fitting on the sump, 2 of them, next to each other, one for the hear return, other for catch can,

its on the turbo side so wouldnt the swing of the crank sorta suck the oil down instead of pressureise it???

whats a AN fitting???

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i have a dash 10 screw fitting on the sump, 2 of them, next to each other, one for the hear return, other for catch can,

its on the turbo side so wouldnt the swing of the crank sorta suck the oil down instead of pressureise it???

whats a AN fitting???

AN is derived by the standard set by the Army Navy for fittings. They are the type of fittings you have, and are measured in dashes, i.e. dash 10 (aka. -10). Each dash is an increment of 1/16".

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