Catch Cans - Volume And Number Of Lines On Closed Ie Non Vented Unit

[Scooby]

recently i saw a catch can made by a well known Sydney fabricator (page 19 of latest HPI magazine). what made it interesting was that it had a line from each rocker cover fitting to the can (connected where the hose joins the rocker covers in stock configuration) as opposed to the normal single line from both rocker covers.

i've heard arguments that a single line from both rocker covers is too small in volume for the fumes being evacuated. the same argument suggested that catch cans had to be of a certain volume for the same reason, although the requirement to retain oil and a filter medium will obviously play some part in overall size. interestingly the Nismo one is about the size of a coke can but drains into the turbo oil drain, and draws from the rocker covers via one line.

based on the number of set ups using a single line to draw from both rocker covers there doesn't seem to be a problem with this approach, and the one in HPI is overkill. does anyone know differently?

cheers

[H@ME]

Hey these i would have taken pics of mine but mine is set up like (looking from front of car) right hand rocker cover > to catch can. 2nd line from the intake line to catch can. i'll try post pics later.

[Rezlo]

Just for interest sakes, anyone know what size 90deg fittings (Earls, aeroquip ectr) one can use on the breather holes to do it in braided/aluminum fittings? I presume RB25 and 26 have the same OD vent pipes?

Also are most of you guys keeping the PCV valve and hose in place? or do you just yank it out and plug it?

[Craved]

-10 AN fittings should work, 22mm should be the ID of the GTR hoses : -10 thread size is 22mm

[Rezlo]

the RB25 uses a 16.2mm roughly ID holes in the valve covers, more than enough meat to go to a 18mm AN adapter...