Blow-by?
Haha I loved the picture and the labeling... but that actually taught me how a catch can worked... I didn't realize it operated off vacuum from the air filter side of the compressor. Good deal!
Originally Posted by StoleIt
any good kits out there for this or all custom build?
. but if you have some basic tools you could make your own kit for prolly half if everything is sourced out right.and to clear up the vtakkk think thats a stupid honda joke since they have vtec and people think since that they have that their car is mad fast yo
if you have a lab top, i'd look into megasquirt. you can build your own for around $200 and a new updated verison, sister card i believe they call it just came out.
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Thread Starter
TECH Apprentice
Joined: Nov 2005
Posts: 304
Likes: 0
From: Newmarket, Ontario
I just built one it cost $15 CND and about 10 min.
1 X 2" ABS cap
1 X 2" ABS threaded male cap
1 X 2" ABS threaded female cap
1 X 2" ABS pipe
1 X pack of 3M rough sanding pad (used as filter)
1 X ABS cement
2 X barbed brass fitting with NPT thread
Glue cap on one side of pipe (about 6 inches of pipe)
Glue threaded female cap on the other side
Drill hole 5/8 in the middle of on ABS threaded male cap
Screw in Brass fitting to ABS threaded male cap
Drill hole 1/3 up on in pipe
Screw in Brass fitting to ABS pipe
Stuff 2/3 with 3M rough sanding pad (it's plastic and acts like a filter)
Screw on ABS threaded male cap
Attached pipes and done...
Simply unscrew cap to check out what's going on, optional valve at bottom to dump out oil if desired.
Valve breathers are the same way but instead of attaching the brass fitting to the side of the pipe, just drill holes in the solid cap (to let air escape, only one brass fitting needed).
1 X 2" ABS cap
1 X 2" ABS threaded male cap
1 X 2" ABS threaded female cap
1 X 2" ABS pipe
1 X pack of 3M rough sanding pad (used as filter)
1 X ABS cement
2 X barbed brass fitting with NPT thread
Glue cap on one side of pipe (about 6 inches of pipe)
Glue threaded female cap on the other side
Drill hole 5/8 in the middle of on ABS threaded male cap
Screw in Brass fitting to ABS threaded male cap
Drill hole 1/3 up on in pipe
Screw in Brass fitting to ABS pipe
Stuff 2/3 with 3M rough sanding pad (it's plastic and acts like a filter)
Screw on ABS threaded male cap
Attached pipes and done...
Simply unscrew cap to check out what's going on, optional valve at bottom to dump out oil if desired.
Valve breathers are the same way but instead of attaching the brass fitting to the side of the pipe, just drill holes in the solid cap (to let air escape, only one brass fitting needed).
Originally Posted by StoleIt
wah? I mean just a good catch can type thing/breathers. not a vacuum pump.
but yeah you can make your own like above and i'd prolly go that route cause i've seen some for liek 100usd.
TECH Enthusiast
iTrader: (27)
Joined: Aug 2005
Posts: 741
Likes: 0
From: Anheuser Busch, Houston Texas
Question: is there actually any positive vacuum on the intake before the turbo inlet? Isn't the whole reason people have to add a vacuum pump because there is no good source of vacuum that can adequately keep up with a (previosuly non turbo'ed) turbo crankcase pressure at boost to do much better at actively pulling crankcase gasses out?
There has to be some answer to this between two passive filter/vents and a $2k vacuum pump that can pull blow by out better than just venting. Or I am just massively confused.
There has to be some answer to this between two passive filter/vents and a $2k vacuum pump that can pull blow by out better than just venting. Or I am just massively confused.
Isn't putting restriction in front of the turbo inlet a very bad thing? I think that's what you're ultimately doing... this layout forces the compressor to create the vacuum you're using to depressurize the crank case.. anybody else concerned about that?
Originally Posted by FastKat
Isn't putting restriction in front of the turbo inlet a very bad thing? I think that's what you're ultimately doing... this layout forces the compressor to create the vacuum you're using to depressurize the crank case.. anybody else concerned about that?
restriction
its not a restriction, the compressor makes a vacuum and it pulling out the the blow by isn't gonna cause a restriction like a say a putting a 1 in exhaust on a v8
Originally Posted by lo_jack
Question: is there actually any positive vacuum on the intake before the turbo inlet? Isn't the whole reason people have to add a vacuum pump because there is no good source of vacuum that can adequately keep up with a (previosuly non turbo'ed) turbo crankcase pressure at boost to do much better at actively pulling crankcase gasses out?
There has to be some answer to this between two passive filter/vents and a $2k vacuum pump that can pull blow by out better than just venting. Or I am just massively confused.
There has to be some answer to this between two passive filter/vents and a $2k vacuum pump that can pull blow by out better than just venting. Or I am just massively confused.
but the reason pumps were ran is to yes get rid of crankcase pressure and just adding breather filters wasn't enough. also this was on older engines
and you had to regulate how much vaccum was made as too much can cause problems with wrist pins
read a few posts i made up, when it boost a n/a pcv setum will be sealed shut
Teching In
Joined: Mar 2006
Posts: 23
Likes: 0
From: Milehigh, Colorado
in a nuttshell, run a hose from valve cover to intake before turbo, problem solved...pulls the pressure out when you get into high boost..no restriction, still feeding off the main intake, your talkin 1 inch hose with a bung attatched to the intake somewhere...Had the same problem on my Typhoon.........
TECH Enthusiast
iTrader: (27)
Joined: Aug 2005
Posts: 741
Likes: 0
From: Anheuser Busch, Houston Texas
AV: You run the catch can in line on the hose that goes back to the turbo inlet to solve (as best as possible) that problem, no?
Ok I think I have seen the 1" hose to turbo inlet on WRX's, so I think I get that concept.
Fourmula: I did know if you run too much vacuum (14"hg?) with a pump you start pulling oil off the pins. But apparently there are mechanical advantages to running a fairly stout vacuum in the crankcase, that we wont get into here, since thats not the point.
So let me get this straight: plug the TB inlet, and run a 1" hose to the turbo inlet off the valve cover with a catchcan inline to act as the "new" pcv when under boost? Would it make any difference to also run the stock PCV into the catch can as well, for when you aren't under boost and it is hypothetically operational? It shouldnt mess it up since it should be closed under boost, and the can would be catching the blow by from the "new" boosted PCV setup.
Ok I think I have seen the 1" hose to turbo inlet on WRX's, so I think I get that concept.
Fourmula: I did know if you run too much vacuum (14"hg?) with a pump you start pulling oil off the pins. But apparently there are mechanical advantages to running a fairly stout vacuum in the crankcase, that we wont get into here, since thats not the point.
So let me get this straight: plug the TB inlet, and run a 1" hose to the turbo inlet off the valve cover with a catchcan inline to act as the "new" pcv when under boost? Would it make any difference to also run the stock PCV into the catch can as well, for when you aren't under boost and it is hypothetically operational? It shouldnt mess it up since it should be closed under boost, and the can would be catching the blow by from the "new" boosted PCV setup.
Originally Posted by lo_jack
AV: You run the catch can in line on the hose that goes back to the turbo inlet to solve (as best as possible) that problem, no?
Ok I think I have seen the 1" hose to turbo inlet on WRX's, so I think I get that concept.
Fourmula: I did know if you run too much vacuum (14"hg?) with a pump you start pulling oil off the pins. But apparently there are mechanical advantages to running a fairly stout vacuum in the crankcase, that we wont get into here, since thats not the point.
So let me get this straight: plug the TB inlet, and run a 1" hose to the turbo inlet off the valve cover with a catchcan inline to act as the "new" pcv when under boost? Would it make any difference to also run the stock PCV into the catch can as well, for when you aren't under boost and it is hypothetically operational? It shouldnt mess it up since it should be closed under boost, and the can would be catching the blow by from the "new" boosted PCV setup.
Ok I think I have seen the 1" hose to turbo inlet on WRX's, so I think I get that concept.
Fourmula: I did know if you run too much vacuum (14"hg?) with a pump you start pulling oil off the pins. But apparently there are mechanical advantages to running a fairly stout vacuum in the crankcase, that we wont get into here, since thats not the point.
So let me get this straight: plug the TB inlet, and run a 1" hose to the turbo inlet off the valve cover with a catchcan inline to act as the "new" pcv when under boost? Would it make any difference to also run the stock PCV into the catch can as well, for when you aren't under boost and it is hypothetically operational? It shouldnt mess it up since it should be closed under boost, and the can would be catching the blow by from the "new" boosted PCV setup.
lo_jack you hook to the actualy pcv on the engine, from there you run a line to a catch can and then to the turbo intake, the other hole on the valve cover your run a breather filter so the engine can suck fresh air into the crank case. if you do it the other way around you'd have to remove the pcv valve itself so you have a way to get fresh air into the crankcase
also if your still geting oil in your intercooler/charger pipes with a catch can installed you've got some blown seals cause that shouldn't happend
Last edited by 89Formulaws6; Mar 21, 2006 at 11:36 AM.
Okay here's my question better explained. I'm talking about the section of pipe between the air filter and the compression inlet. Since the engine is pulling air through the air filter and the turbo, there is a vacuum AND restriction in that piece of pipe. How much? That depends on a lot of things... the size of the pipe, the restriction of the air filter, whether it's a straight shot or a very curvy inlet tube... all of these can cause additional restriction. Let's say you put a very restrictive air cleaner on... what's that going to do to your compressor? It's going to make it work harder to build a given level of boost, and that's just plain bad.
***I am saying that if you put the vacuum inlet of the catch on this peice of pipe between the air filter and compressor, you're going to make the turbo work harder to produce a given level of boost.*** The compressor (when in boost) is making the vacuum... and it's not a free lunch. The vacuum line is going to put added strain on the compressor. How much? I dunno... that's what I want to find out!
***I am saying that if you put the vacuum inlet of the catch on this peice of pipe between the air filter and compressor, you're going to make the turbo work harder to produce a given level of boost.*** The compressor (when in boost) is making the vacuum... and it's not a free lunch. The vacuum line is going to put added strain on the compressor. How much? I dunno... that's what I want to find out!
