Hmm, annoying to say the least.
After some more research I discovered any constriction in the PCV system in a big Derve is bad news for all the oil seals, big and small. With compression at maybe 24-30:1 or something stupid the extra pressure in the crank blows them out.
The outlet is 15mm. I bought a 15mm catchcan..... Turns out thats 15mm OD
12mm ID
So its venting to air at the moment while I get something machined up.
Bloody marvelous. I did get a partial refund from the seller though as they said it was fair enough that it didnt state it in the ad.
6th gen Prelude please Mr Honda. RWD 2.4 turbo lude.