Opss forgot the pics.

I needed some dash 4 AN flex hose for the drain back out of Tracy's
PSRU all the way back to Mike Wills custom oil pan.

He had used rigid aluminium line which is a bad idea if is is really
long. In that case is tends to vibrate, fatigue and crack.
On our eight quart oil pans we have thick materiel on the
front end to accommodate a pipe fittings. There was not
enough height on Mike's trick pan to accommodated the
necessary materiel and  a pipe fitting for the PSRU drain back.

I used AN dash 4 SS braid instead.

I had to re-educated myself on adding AN reusable fittings to AN hose.
A very tricky thing to do.

These are the best written instructions I have found so far.
Follow these  instructions exactly. No skips and no short cuts.
Use paper masking tape. Duct tape and electrical tape tends
to melt. Paper tape burns and remains stiff very important.

The best thing to use for cutting the hose is a hand held
friction saw.

When tightening the back nut clamp the hose in a vice just behind
the back nut. Apply back pressure to the front nut to keep the SS braid
in the fitting.

Paul Lamar


Hi Paul,

Tracy recommends -6 ID at a minimum and notes that there should be no are dips in the line where oil will pool and cause a small amount of back pressure. (similar to a turbo oil return in that sense. That will cause the oil level in the psru to rise and oil will seep out past the input shaft seal.

SS braid is also overkill on a line that sees no pressure, particularly over on the cold side of the engine, but I recommend at least -6.  I have always gotten a misting of oil coming out past that seal because it is difficult to achieve Tracy's goals.  I think that is why Mike used rigid lines, very light weight and easier to prevent dips.  With no pressure in the line a typical crack is unlikely to be catastrophic.

Food for thought.

Glad to see you putting some time into it.

Dave Leonard


Thanks Dave, for paying attention and checking my work.

I needed an engine to test the LII MS ignition as it is a BIG deal :-)
Patent applied for in 100 countries.

I'll risk it and use a better seal on the input shaft. Tracy used a too cheap seal :-).

Here is the hot tip shaft seal for this important location. SS spring loaded Teflon.

How many hours do you have now Dave on your Mazda Turbo powered RV6 ?

Paul Lamar

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