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Single Turbo Oil Feed On Series 1 Block

leeroy_25
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leeroy_25 Community Regular

leeroy_25

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Posted

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

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