i've seen some breather setups that dont seam to vent to atmosphere or the intake and just return to sump which seams madness to me as without a vent surely the engine will just pressurise????

personally for my focus as its only 2l n/a i got a cheap 1l catch tank that was unbaffled and only had 2 ports, made my own baffle (to increase inner surface area to aid oil condensation therefore removing the oil vapour) , connected cam cover to one port, crank case to the other (removing the pcv valve as venting to atmosphere. actually i removed the guts of the valve to use the case as a connector) and the other side of the baffle drilled a hole in the top to accept a pipe connector and breather filter. i could have it return to sump if i wanted but dont want to faff with that so i'm keeping my eye on the site tube. this setup works perfectly for me and has cured my slightly eratic idle that was caused by the fucked pcv valve that loads of people seem to overlook with idle problems.

graham, i'd try a setup like that but use a big breather filter with a large diameter inlet otherwise it could possibly pressurise the engine to some extent if it cant evacuate the excess pressure fast enough. however, on a cossy i'd buy a better catch tank.

oh and i figured out how i was gonna do mine from burton powers little description about breather systems, http://burtonpower.co.uk/technical_1...er_system.aspx

hope this helps mate and enjoy the cossy...i'm soooo fucking jealous!!