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Ah right, I think I have it now. If is was to stop oil syphoning out of the oil line to prevent dry start ups of the turbo then it all makes sense. I saw some threads saying that without it the oil drip tank would full up on shut and could not work out how it prevented this, but syphoning back makes sense as it seats in the cone on the bottom side, preventing this.
Was the sping under the ball a factory fitment? That would in theory then prevent it from acting as a check valve against syphoning.
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1988 930: 3.5L 100mm LN slipins, LN FFA rods, Supertec studs, GT3582R with T4 1.07A/R twin scroll housing, RarlyL8 equal length divided headers, dual Tial MVS 38mm WG's, Carrera 3.2 heads with 993 big valves. 964 Cams, full bay IC, KEP st1 clutch. PE3 sequential ECU with 750cc EV14 injectors, CoP twin plugs, J&S Safegaurd, Aquamist HSF3 water inj. Wavetrac LSD.
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