Ls1 pvc system
The intake manifold vacuum is applied to the crank case via PCV valve. Often done through a valve cover, which typically contains an oil baffle. (crankcase:valve cover -> pcv valve&line -> intake manifold)
Then, somewhere else, perhaps on the other valve cover, through another similar oil baffle, the crankcase is connected to the post-air filter tube (air intake tube) where the crankcase is allowed to draw in fresh air from that source, which then flows towards the pcv valve and into the intake manifold. (crankcase:valve cover -> line -> post air filter tube)
This is the general path for all PCV systems in all engines manufactured around the world.
The catch can would go wherever you have oil collecting issues in any of the pcv lines. Some engines have oil that works its way out of the crankcase, towards the air filter tube (post air filter) and use a catch can there to help stop the oil. Other engines have oil issues coming out of the crankcase and heading towards the intake manifold, so we may install a catch can there to help catch it (until we fix the real problem: oil baffle in the engine, or excess crankcase pressure due to blow-by (bad/loose rings or poor cylinder shape or poor parts application)). Some engines lose oil in both directions, and use two catch cans...
Then, somewhere else, perhaps on the other valve cover, through another similar oil baffle, the crankcase is connected to the post-air filter tube (air intake tube) where the crankcase is allowed to draw in fresh air from that source, which then flows towards the pcv valve and into the intake manifold. (crankcase:valve cover -> line -> post air filter tube)
This is the general path for all PCV systems in all engines manufactured around the world.
The catch can would go wherever you have oil collecting issues in any of the pcv lines. Some engines have oil that works its way out of the crankcase, towards the air filter tube (post air filter) and use a catch can there to help stop the oil. Other engines have oil issues coming out of the crankcase and heading towards the intake manifold, so we may install a catch can there to help catch it (until we fix the real problem: oil baffle in the engine, or excess crankcase pressure due to blow-by (bad/loose rings or poor cylinder shape or poor parts application)). Some engines lose oil in both directions, and use two catch cans...
Last edited by kingtal0n; Nov 29, 2016 at 04:52 AM.
what I did was get the LS6 valley cover with integrated PCV, which eliminates much of the hose routing. The fitting comes out behind the throttle on the passenger side, and in the factory system loops up into a fitting on the "neck" of the intake manifold with a short U- shaped hose. To install catch can, simply connect the fitting on the valley cover to the cam inlet and can outlet to the manifold neck fitting. The throttle fitting connects to a valve cover fitting on the passenger side to provide filtered air ingress to the crankcase.
Yes, the LS6 PCV design is far better than the LS1 and genIII truck engine setup.
http://ls1howto.com/index.php?article=18
http://ls1howto.com/index.php?article=18
