Engine oil cooler feed line insert.

[Tony Wheeler]

Originally Posted by ajmac

That fitting is only waisted as on the V8 it came from there was no cooler return drilled into the block so the horizontal port was used to return the cooled oil into the gallery.

Now that's what I call OPTIMISTIC! Hoping that massively obstructed horizontal passage can pass enough oil to keep the bearings wet, and praying that no tiny morsel of gunk arrives to block it off completely!

waisted outlet fitting.jpg

I think it's reasonable to assume those tiny red apertures are not intended to flow oil, but merely transmit oil pressure to the port, so that a sensor can be fitted if required (sender switch or capillary pipe). For example British T16 PRV mod discussed a while back:

T16 British mod PRV for oil cooler.jpg

Obviously the only safe route for "full flow" oil cooler return is via the third port found on military spec flatheads (or drilled by hot rodders). Oddly enough the Ford CMP manual depicts "full flow" filtration achieved by means of a waisted bushing. This system has never been found on any vehicle, but the diagram serves to demonstrate the potential application for hot rodders. Hence the screw-in waisted fitting may be an aftermarket product for conversion to "full flow" filtration, without having to drill and tap for a grub screw. As you say Alistair: "the long fitting simply does the same job as the grub screw".

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