Here is my Enya .60.
I soft-soldered a steel patch to the inlet manifold, so as to provide enough material to accept a threaded nipple.
When the engine is running, you can clearly see the flow of "mostly-oil" from the crankcase to the inlet manifold. It's a surprisingly good flow rate ... and it guarantees that fresh lubricant is reaching those hard-to-lubricate timing gears.
Here is my Saito 2.20.
The manifold is an alloy casting, so I drilled a small hole into the flange and let in a piece of brass tubing. I carefully flared the end of the brass tubing such that the silicon tube is more securely retained.
