setup 1: delete pcv from plenum, block up everything associated. route hoses from front inlet cam covers to a catch can, vent back into the accordian pipes at stock location.. deleting the pcv's completly is this reccomended for street cars ??? or only track cars ? setup 2: route pcv hose from pcv in plenum to a new nipple on inlet cam covers route hoses from front inlet cam covers to a catch can, vent back into the accordian pipes at stock location.. both these would be a legal setups right ? now to decide which one im doing ???
Been covered many times..... Use search for information. IMHO, there's no benefit in PCV valve deletion
i did use search and didnt find anything on whether the first setup is used for track cars only or reccomended ok for street cars aswell.. there is alot of talk about deletion but i couldnt find if it was good for street cars hence the question... and thanx for ur opinion but care to explain why you think that ? what is your reasoning behind it ?
This is the right answer "there's no benefit in PCV valve deletion" full stop, and the same can be said for the egr imo.
All crankcases have to breathe/relieve pressure.... so drawing those fumes into the combustion chamber via a valved system specifically designed for the job is a 'no brainer'. What's the alternative : throw it in a tin that you have to empty periodically, or let it dribble down the side of your motor till it deposits itself on the road I also agree with beaver, there's no point in deleting a working Egr valve.... only problem is, when they stop working they're nearly impossible to replace with the engine 'in situ'..... that's why most people give them the 'heave ho' if they pull the motor for any reason.
In my opinion the less oil in the intake system the better. Go with option one, both are legal, no sense in two IMO.
this is all very valid points but im just trying to get my head around it all that some of the best zeds on this forum do not run a pcv system at all... black beast wizard badxtc just to name a few, with all no ill effects ??? they all reccomend to delete the pcv's completly and run a catch can off the front inlet cam covers but have their catch cans vented to atmos... i was thinking doing that setup but run the catch can back to the stock accordian pipe location ? i can still do this other option where i can still use the pcv's valve and route to inlet cam covers but im trying to figure out the most simplist way and better way to keep oil out of the plenum etc...
There is the other reason that they are rerouted to a catch can system is to stop oil from flowing into the pipe work on (iirc) hard left hand corners. The Oem design was slightly flawed for when the engine is in race mode. Hence they capture this excessive oil in a can and simply allow the vapour to exit into the atmosphere. Where by blanking the Pcv's off it stops any excessive unwanted oil entering the plenum. Which results in smoking... If you're not keen to vent to atmosphere. Get a catch can, have your feed hose 3/4 to the top of the can, fill the can with medium steel wool and have your vent hose exit the top. Vent hose can then be plumbed into the accordion pipe with a check valve in place. The steel wool will cut down on oil vapour or misting, and the check valve will act like a Pcv and stop the can from pressurising when on boost. Assuming you have a turbo engine. If na, just run the hose back without the check valve.
The only thing really worth doing I think is re-routing the pick ups from the passenger side exhaust cam cover as they can fill with oil on fast right hand corners. I guess you can put a catch can in the system somewhere if you want but anything venting to atmosphere is illegal I think. Not sure that it would be worth the effort though.
why do u need a check valve there ? theres no check valve from factory there ? the turbo sucks all the time no pressure there ??? yeah thats the easiest thing to do but i got eveyrthing out of the way atm so i might aswell go abit further into it... whats ur opinion on deleting the pcvs and putting a catch can from the front intake cam covers then routing back into accordian pipes .. or would u still do that to the fronts but for the plenum pcv still leave it but as you said just change the pickup to the intake cam covers..
Pcv is spring loaded. I'm assuming you're plumbing the hose into the accordion pipe that attaches to the throttle body. If this is where you're putting it the positive charge pressure will pressurise the can. When plumbed up normally the positive pressure closes the Pcv up until your off the throttle and the engine returns to vacuum. I you're plumbing it to the turbo suction pipe them yes, always under vacuum.. Check valve would be ideal between the accordion that attaches to the throttle body and can. If that makes sense.
the accordian pipe is the one between the pod and the turbo ... stock location where the front intake cam covers go to...
There is NO real benefit in deleting the PCV system and plumbing the discharge from a catch can back into the inlet somewhere. Just because some dudes with hot cars did this does not mean its a valid "modification". It does NOT result in any measureable increase in performance unless the engine is so shagged and chuffing so much oil that it actually affects combustion and AFR's. It results in a permanently, partially pressurised crankcase (slight, however well vented) which tends to result in increased oil weeping from seals and gaskets along with dosing more of the intake system with oil which condenses from the vapours. Fitting catch cans and the like really harks back to the days when engines didnt actually have any pcv system and just discharged crankcase fumes and condensed out oil to the ground. OR the engine lunches itself and trys to spew the liquid contents of its bowels out the vent pipe.......Not a good thing on a racetrack. Seems to me a total WOFTAM to fitup catchcans and so-on sundry bollocks onto road cars with perfectly working pcv systems. E
thanx for the reply guys ive decided which setup im going with after the replies and doing alot of reading... im going to keep the stock location pcv's in place in the plenum and just reroute the pickup points to the inlet cam covers... now for the front inlet cam covers i will run them to a catch can. can i run the vent from the catch can back to the stock location on the accordian pipes (where the original points on front inlet cam covers go to) ... ???
