Pvc-pcv....
10-22-2005, 02:01 AM
#1
Pvc-pcv.... here's how I got my crankcase vented... all 3 ports on the valve covers each going to a port on the canister and the largest opening crankcase breather filter I could find, the canister is a small lenth 2"pvc pipe w/end caps, I used 3/8"hose.... short of drilling the oilpan or another spot on the engine this is the most vented you can get... and when you need venting the most under boost there is not a checkvalve choking up the system... I kinda got this ideaw after seeing how the 1000hp supra's have there pcv system... go ahead and copy if you need to do something w/your pcv... let me know what you guy's think 
Last edited by Assassin; 10-24-2005 at 09:36 AM.
10-23-2005, 03:18 AM
#4
TECH Fanatic
iTrader: (5)
Join Date: Apr 2005
Location: Phoenix AZ
Posts: 1,005
Likes: 0
Received 0 Likes
on
0 Posts
Lol it is cool man. I need to address that problem myself. ATM i have it hangin infront of the engine lol. they vent right infornt of the pass valvecover. I need something like that. GJ
John
John
Trending Topics
10-23-2005, 05:18 PM
#8
you can get the filter at any autoparts store just make sure the bottom opening is really big and dont forget the gromet......
but it does look very suspicious buying a 1ft peice of pvc and 2 end caps from the hardware store
, then you try to explain what your making and you get 
.......
thanks for the reply's, now I dont feel like a goof...
but it does look very suspicious buying a 1ft peice of pvc and 2 end caps from the hardware store
, then you try to explain what your making and you get .......thanks for the reply's, now I dont feel like a goof...
10-23-2005, 11:05 PM
#11
TECH Regular
iTrader: (4)
Join Date: Jun 2005
Location: Marietta, GA
Posts: 408
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by DeltaT
How will you drain the oil out of it?
Jim
Jim
10-24-2005, 01:13 AM
#12
Originally Posted by DeltaT
How will you drain the oil out of it?
Jim
Jim
10-24-2005, 05:32 AM
#13
It's called PCV because it's Positive... it means that something is sucking the vapours (usually the manifold vacuum).
Your system looks like a race setup: just vented to the atmosphere taking advantage of the blow-by.
Are you sure to vent the crankcase enough when not under boost?
Your system looks like a race setup: just vented to the atmosphere taking advantage of the blow-by.
Are you sure to vent the crankcase enough when not under boost?
10-24-2005, 09:33 AM
#14
maybe I misunderstand your post but, its positive not because there's a vaccume(that would be negitive), its positive because its the pressure created basically by the back side of the pistons and moving parts, when not under boost there is not enough crankcase pressure to be a problem, the rings still seal just fine due to that fact, if you have it routed to the manifold w/ a check valve all it will accually do is just suck up the oil smoke cloud in the valve covers created from when you choked up the system a second ago while under boost, but yes it does breathe enough because of the large opening filter and the inside diamater of the hose used is slightly larger than the openings on the valve covers themselves...
10-24-2005, 11:12 AM
#15
mhhh... maybe my bad English...
To my understanding it was "positive" because it's not "natural" but "helped" by the manifold vacuum.
But you are right: under boost there is pressure in the crankcase, that's why I put a catchcan between the valvecover and the blower inlet - without it I always had oil in the blower (original Vortech setup).
This catchcan empties itself during normal operations (air is sucked through in the opposite way).
It also depends on the climate: we have pretty clod winters here and without a real PCV system my oil is full of water in winter. In summer I probably could drive without it, but only if the engine can warm up enough.
To my understanding it was "positive" because it's not "natural" but "helped" by the manifold vacuum.
But you are right: under boost there is pressure in the crankcase, that's why I put a catchcan between the valvecover and the blower inlet - without it I always had oil in the blower (original Vortech setup).
This catchcan empties itself during normal operations (air is sucked through in the opposite way).
It also depends on the climate: we have pretty clod winters here and without a real PCV system my oil is full of water in winter. In summer I probably could drive without it, but only if the engine can warm up enough.
11-03-2005, 11:32 PM
#16
TECH Addict
iTrader: (2)
Join Date: Feb 2004
Location: Tampa, Fl
Posts: 2,784
Likes: 0
Received 0 Likes
on
0 Posts
Im having a hard time figuring out how you run this system so bare with me. There was originally a 3/8 hose going to the tube on the TB. My vortech capped that tube on the TB and ran the hose over to the inlet of the blower. Now Ive changed to a FMIC and my MAF is power blower so I dont have a way to put that piece in the intake path. Should I just stick a breather on the valve cover and leave the hose hanging. I put the 3/8 hose back on the TB tube and Im now noticing that my truck is dripping oil onto my garage floor so Im assuming this isnt the correct way to do this.
11-04-2005, 02:47 AM
#18
So your valvecover is connected to the TB as stock?
In this case when you are under boost you are blowing air in the crankcase!
Vortech connects the valvecover to the inlet of the blower (and behind the MAF) so that the air sucked by the PCV is metered.
You don't need it because you blow through the MAF.
In your case I would put a breather instead of the oil cap and plug the connector on the TB as Vortech did. Also plug the fitting on the valvecover.
I have a checkvalve between the manifold and the PCV valve and this helps not pressurizing the crankcase.
If you have a lot of blow-by, gasses will come out from the breather when under boost and you may smell them. In this case I would put the cap back and connect the valvecover to the inlet of the blower. In this way the gasses are sucked in the engine and burned. For this connection don't go with a too small hose or pressure won't be released fast enough. Maybe the next bigger diameter than 3/8.
In my system I also have two catchcans, but I would first try without them and see how it works.
In this case when you are under boost you are blowing air in the crankcase!
Vortech connects the valvecover to the inlet of the blower (and behind the MAF) so that the air sucked by the PCV is metered.
You don't need it because you blow through the MAF.
In your case I would put a breather instead of the oil cap and plug the connector on the TB as Vortech did. Also plug the fitting on the valvecover.
I have a checkvalve between the manifold and the PCV valve and this helps not pressurizing the crankcase.
If you have a lot of blow-by, gasses will come out from the breather when under boost and you may smell them. In this case I would put the cap back and connect the valvecover to the inlet of the blower. In this way the gasses are sucked in the engine and burned. For this connection don't go with a too small hose or pressure won't be released fast enough. Maybe the next bigger diameter than 3/8.
In my system I also have two catchcans, but I would first try without them and see how it works.
11-04-2005, 08:21 AM
#19
TECH Addict
iTrader: (2)
Join Date: Feb 2004
Location: Tampa, Fl
Posts: 2,784
Likes: 0
Received 0 Likes
on
0 Posts
thanks. Ive only gotten into boost a few times since I did this. Hopefully I didnt blow the main seal. What do you think? Its not that big of a deal since Im trying to decide on a new motor anyway. I'll get all that fixed today. Thank you
11-04-2005, 09:48 AM
#20
TECH Addict
iTrader: (2)
Join Date: Feb 2004
Location: Tampa, Fl
Posts: 2,784
Likes: 0
Received 0 Likes
on
0 Posts
Anyone have any pics of the lines that need to be vented to this catchcan breather assembly so that I know what Im looking for? Im going to make something like this today.