Vct Oil Return Line

[works 510]

Lads,

Just finalising the small bits and bobs of my motor build,

Its a Rb30det using a R33 RB25 head with aftermarket RB20 cams.

As the VCT gear isnt fitted, would blocking the drain line up at the head be harmful?

Just looking for a simpler motor, and if its not needed, it wont be fitted

Cheers,

[The Mafia]

I am not sure what you mean, but if you are talking about the feed that passes through the block into the head, and you do not block this, you will have a catastropic failure.

Where is the "drain" that you are talking about? Pics?

[works 510]

The offending drain passage.

[The Mafia]

don't block that one!

I did this last weekend:

Use tapered fitting where you can, but for the y piece, I went to bunnings and got a Brass tap splitter. The 90 degree bend on the left are also brass tap fittings. The rest are hydraulic tapered fittings.

I used Loctite 567 on them. They will never ever leak. They binded up so well with that shit.

Good luck.

Edited July 8, 2010 by The Mafia

[D_Stirls]

From my understanding that isn't a drain as such but more of a balance tube to balance the pressure between the head and the sump (it sits too high in head to be purely a drain). By having an axillary tube preform this function is means that the oil drain gallery's don't have air trying to move towards the head allowing for better oil draining.

CA's have the same thing on the other side of the engine.

Edited July 8, 2010 by D_Stirls

[works 510]

Learn something new everyday, will retain that part

Cheers for the info, and for the pics

[R31Nismoid]

You going to put some shielding on that hose Jono?

I hope so

[The Mafia]

not sure yet - Its hose that is rated at some decent temperature (Got it from the hydraulic place) But I might just do it for piece of mind.

What do you suggest shielding it with?

[works 510]

This is what I ended up doing for anyone in the future with the same question I had.

Cost was about $80 including hose from pirtek.

Still going to give it some heat wrap.

Edited July 12, 2010 by works 510

[D_Stirls]

The only problem is see with those setups are that any blow-by will want to get up that tube to get to the head to be breathed. The down side is that the return oil from the turbo is trying to get down the same tube. As the tube won't be 100% full you probably won't have a problem but if you turbo starts smoking you know where to look.

[works 510]

I see what you mean, but what other options are there, other than putting that line directly to the sump?

Rb30 blocks dont have a threaded hole for that front drain/breather.

Im also running a rear head drain back to the sump.

[lukeybrah]

what thread size and pitch is the VCT return bung in the block? looking to get that fitting with the Y piece