Ideas On Slimmest Possible Oil Return From Back Of Head...

[bubba]

My motor had an oil return from the back of the head but when we put it in my car it didn't fit (was in a commodore) so we put a blank there (the fitting for the return was so huge it was preventing us from tilting the motor back to get the gearbox in and out).

Now this hasn't presented an issue until a track day a few weeks ago where the sustained high revs started pushing a heap of oil into the catch can.

I'm trying to find the slimmest possible way of putting a decent sized oil return back on.. something along the lines of drilling/tapping the blank fitting in there at the moment and screwing in a banjo fitting of some sorts..

Any suggestions? and how big (ID) would the return have to be?

[Sydneykid]

The problem is it's a gravity return, no pressure to move the oil though the pipe/hose. Plus, at high rpm, there is a lot of oil to move. So the biggest possible fitting and hose is the go.

Cheers

Gary

[bubba]

Thanks Gary

Yeah I figured it was gravity return and that's why the old fitting was so large.. wonder if I can find/make something that is wide but not deep..

Maybe two small banjo fittings.. guess I'm going to have to peruse mucho catalogues and see if there is anything to suit.

If I drill/tap the existing bung I have in there, I would need to be doing so as low as possible yes?

[Al]

Not sure what you term as big, but this is how mine has been done.

[bubba]

Yeah that's pretty much what it used to have but that fitting sticks a good couple of inches out the back of the head, there is probably *just* enough room to have it there but it has to be taken out everytime the engine goes in or out.

I'm trying to come up with a way to do the same thing but with something that only protudes say 20mm out of the head.

Edited June 10, 2008 by bubba

[Al]

I could assure you mine does not stick out 2" from the head, just the thickness of that fitting.

Had no issues fitting and removing the engine, with that fitting, but mine is an R33 GTST

[GTScotT]

big hammer and give the firewall a massage

[r33_racer]

I machined up and fabricated one that fits the ID of the whole welsh plug hole with an ally pipe coming off it that goes down towards the inlet side, the ID of the return pipe is 3/4" and has a -12 fitting on the end. The whole block sticks out 39mm from the back of the head. In our r33, there is no problem with clearance when taking the motor in and out. The same fitting was used in a r32 4 door and the firewall had to be moved back for it to clear, but it wasnt much.

But both these are used in dry sump setups. But I would imagine you would want the return as big as possible as gary stated.

As said you can always move the firewall back a little!

[bubba]

Hmm guess it's back to the mallet and old fitting.

Cheers guys.

[R34GTFOUR]

just tap it in, give it the old tap tap taparoo.

Whats the problem you oil fitting you to good for your home???

ok im tired, im going to bed now...

Edited June 11, 2008 by R34GTFOUR

[bubba]

just tap it in, give it the old tap tap taparoo.

Whats the problem you oil fitting you to good for your home???

ok im tired, im going to bed now...

lol wut?

get some sleep and try again

[infamous_t]

just tap it in, give it the old tap tap taparoo.

Whats the problem you oil fitting you to good for your home???

ok im tired, im going to bed now...

lol, don't worry, I got it, Happy Gilmore ftw!

[bubba]

It was this bit I didn't get... "Whats the problem you oil fitting you to good for your home???" wut??

[benm]

It makes sense if you drink a 6pk before reading it....

[bubba]

It makes sense if you drink a 6pk before reading it....

Unfortunately I can't test that theory till after work.

But please, back on topic

[shanef]

It makes sense if you drink a 6pk before reading it....

only a 6pk? man they bread em soft down south

P.S watch the game last nite?

[Duncan]

I've got the same fitting as Al, also with 3/4" return and I don't have too much oil in the head problems. Mine is tapped into the head beside the welshplug though because a the engine doesnt sit flat in the engine bay and b you cant tap into a brass welsh plug so you have to machine a replacement for that as well. this is in a 32 (gtr). I have massaged the firewall for tilting clearance but did not need to just to fit it

[bubba]

Cheers guys.

My head has had the welsh plug removed and thread tapped in, there is currently 1" BSP plug/bung/blank/whatever in there. Been talking to my mechanic and we're just going to put the old 90deg fitting that he was using back in.

Any dramas with T'ing into the turbo oil return?

[shanef]

highly doubt it man. both aren't under pressure and are fairly large in size

[bubba]

Cheers