PVC Catch can system.... Final conclusive answer
On The Tree
Joined: Feb 2011
Posts: 111
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ok i have a just standard ls1 with a few mods making around 430 rwhp no turbo or anything and wanted to know what diagram i would work off of for my setup and which catch can i should get, any help would be appreciated thanks.
I used to sell them. I dont any more but am looking to have them made again. I have seen a big push to have them offered again. I am working with two machine shops now to see what we can do.[/QUOTE]
please pm me with some pricing on the cylinders if possible
i wouldnt mind something with more capacity.
the top hole needs to fit a standard valvecover grommet 1.25" and the bottom would prefer to have a drain than unscrew it.
for the sides, need two 1/8 or 1/4 npt fittings on the bottom and one 3/8 npt thread at the top
also if anyone has ties on an adapter from the double helis ls oil fill tube to a standard valvecover breather grommet 1.25" (other than $30 metco) please do let me know!
please pm me with some pricing on the cylinders if possible
i wouldnt mind something with more capacity.
the top hole needs to fit a standard valvecover grommet 1.25" and the bottom would prefer to have a drain than unscrew it.
for the sides, need two 1/8 or 1/4 npt fittings on the bottom and one 3/8 npt thread at the top
also if anyone has ties on an adapter from the double helis ls oil fill tube to a standard valvecover breather grommet 1.25" (other than $30 metco) please do let me know!
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If I'm understanding that diagram correctly, then it will be fine when you're not in boost, but when the throttle body is pressurized, then no evacuation occurs. On my LT1, I have almost the same configuration but I have the vacuum point on the pipe going to my Air filter instead of the throttle body. That way I always have vacuum, never pressure. The only drawback is it is a rather weak vacuum, especially at idle. But on balance, it does a good job of drawing condensation moisture out of the engine. Every week when I open the drain on the catch can, there is about 1/8 to 1/4 cup of oil tinged water that comes out.
If I'm understanding that diagram correctly, then it will be fine when you're not in boost, but when the throttle body is pressurized, then no evacuation occurs. On my LT1, I have almost the same configuration but I have the vacuum point on the pipe going to my Air filter instead of the throttle body. That way I always have vacuum, never pressure. The only drawback is it is a rather weak vacuum, especially at idle. But on balance, it does a good job of drawing condensation moisture out of the engine. Every week when I open the drain on the catch can, there is about 1/8 to 1/4 cup of oil tinged water that comes out.
I should mention I am only planning on around 700hp max over the life of the build.
Last edited by ryle; Mar 1, 2012 at 07:37 AM.
Right now, my configuration pulls from both valve covers and the intake(LT1) but I'd love to get a 'real' vacuum pump to help with ring seal as well as condensation, etc. Have you guys discovered a pump that will live on a daily driver? I think that most of them I see are 'race only' and would expire/wear out on a daily driver rather quickly.
What is the reasoning for this? Is there more positive pressure in the crankcase than the valley cover can vent while in boost? After all the valley cover is seeing the same pressure as the valve covers and is connected internally. That being said it is venting the same air so the only limiting factor would be the flow potential of the valley cover orifice.
I should mention I am only planning on around 700hp max over the life of the build.
I should mention I am only planning on around 700hp max over the life of the build.
take your valley cover and blow though it. personally i dont think its enough to properly vent a stock engine. i believe gm caved on their pcv flow in order to limit oil consumption. the newer ones are even more restrictive.
only part of the system where i would use the valley cover is as a fresh air inlet
mightyquick - i think a race/vac pump of any kind trying to get ring seal is not really same category as setting up for proper pcv function. i tried one and got rid of it quickly.. one of those things on a more 'normal' car that you never really see the ROI on.
I welded a -12 bung to the drivers side valve cover and ran a single line all the way back to behind my rear axle and mounted a vented breather there, I also ran my coolant overflow to the same location on the passenger side, I wanted all my oil and coolant to blow out behind my rear wheels incase anything should happen during a pass
Last edited by cjmatt; Mar 2, 2012 at 10:25 AM.
I welded a -12 bung to the drivers side valve cover and ran a single line all the way back to behind my rear axle and mounted a vented breather there, I also ran my coolant overflow to the same location on the passenger side, I wanted all my oil and coolant to blow out behind my rear wheels incase anything should happen affirming a pass
my coolant overflow is set to shoot right on my windsheild so me and everybody else sees it when it happens, and bonus to keep off my own tires.
i see everyone is running a hose to the inlet of the turbo,what "I" think should happen is the hose going to the inlet of turbo, should run thru another catch can for safety of absolutley no oil being sucked,and then hose befor MAF,you really dont need unmetered air ,,maybe this was talked about and i missed it..
depends on how that hose is used. if it is for a fresh air inlet (such as me) then the air goes the other way most of the time.
also in general i dont reccomend spending on mods that arent necessary.
if the tube isnt getting oily then you arent having oil that you need to catch. this is my case.
also in general i dont reccomend spending on mods that arent necessary.
if the tube isnt getting oily then you arent having oil that you need to catch. this is my case.
Thats a good idea too. I figure if anything happens thats going to cause me to leak, someone will let me know i was spraying out the back of the car. I end up running pure water anyway