Ralph Wiggum Moar Powar Babeh Lifetime Members 19,331 Member For: 19y 5m 12d Gender: Male Location: Perth Posted 08/06/16 12:37 AM Share Posted 08/06/16 12:37 AM 59 minutes ago, barnz said: I dont have a diagram or pics atm but can take some later. The factory setup has the pcv valve at the rear, they can call it a pcv valve all they like its just a check. That goes to the manifold and sucks in gas under vacum. the most forwad fitting on the rocker is the breather, it lets in make up air as the gases are exhausted or sucked into the manifold if you will. Even when the check is closed by boost pressure the crank case is not sealed as the breather is open. As I said it definitely does vent under boost coz of blow by which is evident from the oil that builds up in the intake piping. The reason you need a check after the can on the vac line rather than at the rocker cover is to stop the can pressurising. The reason the factory puts a check in is to prevent boost being pushed through the crank case and out the breather. Similarly a pcv on a NA engine has a spring that's just a little to weak to hold it closed under idle vacum, as the vacum decreases when the throttle is open the spring closes the pcv which prevents a vacum leak. I dont understand why ppl dont replicate the factory cct with some cans as it is legal and keeps almost all the sh*t being sucked back into the engine. Its not as ideal as venting to atmo in respect to sucking in 100% clean air but its legal and nearly the best of both worlds. Seems like a crazy amount of blow by if dual breathers are required to prevent excessive crank case pressures. My Setup is as you have described. Stock Crankcase breather arrangement (with a catch can) and a PCV catch can with a check valve so the can doesn't see boost pressure. Works a treat. 2 Link to comment Share on other sites More sharing options...
barnz Member 3,047 Member For: 11y 3m 15d Gender: Male Location: Brisbane Posted 08/06/16 12:38 AM Share Posted 08/06/16 12:38 AM yeah I know, ive seen na engines with just filters on the rockers blow a fair bit under wot. Just finding it hard to belive that one breather open with vacum from the intake isnt enough but maybe its not in really high boost applications. Be interested to know if that is the case and roughly how much boost you have to be running to get to that point. Also realistically how long do you need to be at wot to build up excessive pressure with an open breather? Sorta waiting for ralph to jump in and correct me if im wrong lol 13 minutes ago, Ralph Wiggum said: My Setup is as you have described. Stock Crankcase breather arrangement (with a catch can) and a PCV catch can with a check valve so the can doesn't see boost pressure. Works a treat. well there you go How are the inside of your cans baffled/packed and where are the inlet/outlets. This info will help gunna design his as I belive there is a bit of a science to the way the cans are designed/packed. Link to comment Share on other sites More sharing options...
barnz Member 3,047 Member For: 11y 3m 15d Gender: Male Location: Brisbane Posted 08/06/16 12:54 AM Share Posted 08/06/16 12:54 AM Marcus google speedflow check valve they have then in -6 and -8 if your still trying to find them. 1 Link to comment Share on other sites More sharing options...
Ralph Wiggum Moar Powar Babeh Lifetime Members 19,331 Member For: 19y 5m 12d Gender: Male Location: Perth Posted 08/06/16 01:08 AM Share Posted 08/06/16 01:08 AM 28 minutes ago, barnz said: well there you go How are the inside of your cans baffled/packed and where are the inlet/outlets. This info will help gunna design his as I belive there is a bit of a science to the way the cans are designed/packed. Similar to this, they are monza ls series cans (A guy organised a group buy a while back.) They have a baffle/oil seperator plate and an mesh gauze. Double R Ron posted some good pics a while back. 1 Link to comment Share on other sites More sharing options...
barnz Member 3,047 Member For: 11y 3m 15d Gender: Male Location: Brisbane Posted 08/06/16 01:11 AM Share Posted 08/06/16 01:11 AM lol keif, it is so lame that you hide any posts involving crticisim of yourself that I make...that was also just a genuine question....new feature or did you do it? If its a new feature merging double posts yhat would be cool, be better if it took the edit timer from the most recent post though.... 1 Link to comment Share on other sites More sharing options...
k31th less WHY; more WOT Site Developer 29,291 Member For: 16y 10m 25d Gender: Male Location: Melbourne Posted 08/06/16 01:18 AM Share Posted 08/06/16 01:18 AM Link to comment Share on other sites More sharing options...
Ralph Wiggum Moar Powar Babeh Lifetime Members 19,331 Member For: 19y 5m 12d Gender: Male Location: Perth Posted 08/06/16 01:21 AM Share Posted 08/06/16 01:21 AM Some info on my catch can install on this page. Link to comment Share on other sites More sharing options...
barnz Member 3,047 Member For: 11y 3m 15d Gender: Male Location: Brisbane Posted 08/06/16 05:40 AM Share Posted 08/06/16 05:40 AM Better delete ralphs post keif his link isnt even broke it just doesnt exist....inFACT dont worry, delete this post as wll ill start a new thread about it 1 Link to comment Share on other sites More sharing options...
k31th less WHY; more WOT Site Developer 29,291 Member For: 16y 10m 25d Gender: Male Location: Melbourne Posted 08/06/16 05:43 AM Share Posted 08/06/16 05:43 AM 4 hours ago, k31th said: ^^^ Link to comment Share on other sites More sharing options...
barnz Member 3,047 Member For: 11y 3m 15d Gender: Male Location: Brisbane Posted 08/06/16 05:48 AM Share Posted 08/06/16 05:48 AM lol ill let it go. Probably been enough of an ass now... Link to comment Share on other sites More sharing options...
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