# Catch can design and fabrication **URL:** \ **Category:** Shift518 Automotive\ **Created:** [January 28, 2011, 6:29am UTC](https://forums.speedlife.net/t/catch-can-design-and-fabrication/256654 "2011-01-28T06:29:39Z")\ **Posts on this page:** 1\ **Showing post:** 31
**Author:** ![Boxersix](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/boxersix/32/6327_2.png) [@Boxersix](https://forums.speedlife.net/u/Boxersix)\ **Post date:** [January 31, 2011, 1:28pm UTC](https://forums.speedlife.net/t/catch-can-design-and-fabrication/256654/31 "2011-01-31T13:28:00Z")
> [@DVI-D??????????? HELP](https://forums.speedlife.net/t/dvi-d-help/39276/7): > > I like the idea of recirculation. Vacuum in the crankcase is known to promote ring seal and reduce oil leaks. In the sake of cleanliness the filters are fine. A guy on LS1Tech did a good PCV set up with a turbo car. Yes it did need a few check valves. You won’t see the benefit to run case vacuum to promote ring seal(using low tension rings) until at least 12-14" hg, and you can’t get that running off an intake manifold or turbo inlet while the engine is under any sort of useful load… If you’re pulling more than 1-1.5"hg in your inlet tube, you have a clogged air filter. that’s why people with big HP doing this either run a separate belt driven vacuum pump, or a dry sump system with roots scavenge sections that create case vacuum. --- _[View the full topic](https://forums.speedlife.net/t/catch-can-design-and-fabrication/256654)._