Need Pics Of Rb26 Enlarged Oil Returns.....

[Ramius83]

Hey guys. Coming from the US on this one. I can't seem to find an accurate picture of the degree of which you all are enlarging the head and block oil returns. My engine builder is second to none here on the East Coast, but hasn't dealt much with this type of mod to the RB26. I need semi-close pictures of the oil returns that you are enlarging and to the degree that you are enlarging them. Are you just cleaning up the casting to facilitate the oil returns or are you actually taking 1-3mm from the returns...????? Thanks in advance.....

[Ramius83]

Anybody??????

[GTRsean]

Here's mine, marked in red are the oil returns, ready to be drilled. I drilled out the rear one's out to the gasket template.

The other oil return holes can be drilled out another .040-.080 thou. Of course the block would be drilled out to the same size to make it worth while.

Put a -10 or larger oil vent line from the sump (above oil level, near the top of sump) into a breather/catch tank too. I need to do this, because at the track my oil is not returning back into the sump quick enough (high revs+boost), and it's filling the catch can!

[DRIFTER]

pretty sure you drill them out from 8mm to 10mm, which is the same size as the holes in the head gasket.

[Ramius83]

GTRSean and DRIFTER, thank you for your responses. It does make sense that the existing returns be enlarged to that of the headgasket. For some odd reason I did not think of that when talking with my engine guy. We lined up the headgasket on head and then onto the block and you can OBVIOUSLY see what needs to be done, exactly that of GTRSean's picture. Thank you both.

[Ramius83]

Put a -10 or larger oil vent line from the sump (above oil level, near the top of sump) into a breather/catch tank too. I need to do this, because at the track my oil is not returning back into the sump quick enough (high revs+boost), and it's filling the catch can!

BTW, you wouldn't happen to have a schematic for this sump vent would you? I am having a hard time picturing this. This is how I am picturing it. Both the cam covers run to the catch tank, K&N filter on catch tank, steel wool in catch tank. Then hose runs from bottom of catch tank to the vent you are talking about above oil level on sump. I already have a fitting there for the oil return/vent from the back of the head. Can I run that same fitting for the catch tank or make another next to it?

[zebra]

run the rear head return down to the sump. I dont have a pic on hand atm