Single Turbo Oil Feed On Series 1 Block

[leeroy_25]

I am building an RB30/RB26 ad running a single turbo setup.. I have the series 1 block which does not have the oil feed in it for a turbo so was planning to take a feed from the oil pressure switch. What I noticed though is I think most the turbo takes a -4AN (1/4") bore fitting where as the oil switch is only 1/8"NPT Will I get sufficient oil for the turbo from here? Looking in side the turbo it seems the oil holes to the bearings are only very small but I want to be sure.. I guess I could open up the oil switch hole in the bock to take a larger fitting but only want to do that as a last resort as the engine is pretty much built and I don't want to risk getting metal swarf inside the gallery when drilling and tapping it out!

Advice please.

Thank you

Lee

[fletch rb30]

It will be ok.

Or if your worried, you could always drill and tap the oil filter adapter for a 1/4 fitting

[cdorhout]

FYI, I believe the fitting in the block for the oil pressure sensor is 1/8 BPT, not NPT. You should double check, but I'm fairly sure.