Forrest Gump 9 Posted August 8, 2017 Report Share Posted August 8, 2017 Hello all Is it possible to run the car with the PCV capped off? I'm thinking about running this set up. From the engine block will run to an oil catch can with filter. The PCV will still attached to the intake manifold but will be capped off. Anyone run this set up? Any adverse affect? Just trying to keep the damn intake manifold clean. Quote Link to comment Share on other sites More sharing options...
aussiek2000 Posted August 8, 2017 Report Share Posted August 8, 2017 As long as you vent the crankcase pressure somewhere, you are fine. Quote Link to comment Share on other sites More sharing options...
Zx2guy19 Posted August 8, 2017 Report Share Posted August 8, 2017 As long as you vent the crankcase pressure somewhere, you are fine. This...I ran my PCV blocked off for years on a boosted engine. Granted...that engine did explode. Twice. :dumb: Quote Link to comment Share on other sites More sharing options...
aussiek2000 Posted August 8, 2017 Report Share Posted August 8, 2017 you just don't want to block off all ventilation or you'll blow the seals out of the engine. Quote Link to comment Share on other sites More sharing options...
Zx2guy19 Posted August 8, 2017 Report Share Posted August 8, 2017 you just don't want to block off all ventilation or you'll blow the seals out of the engine. Lol hopefully I didn't imply that was the case. Correct, I had it vented. Quote Link to comment Share on other sites More sharing options...
DKilbourne Posted August 8, 2017 Report Share Posted August 8, 2017 Mine is capped with a breather setup off of each valve cover. Quote Link to comment Share on other sites More sharing options...
caseyctsv Posted August 8, 2017 Report Share Posted August 8, 2017 What is the advantage? Quote Link to comment Share on other sites More sharing options...
Forrest Gump 9 Posted August 8, 2017 Author Report Share Posted August 8, 2017 What is the advantage? Clean intake manifold is the goal. Oil vapor can't be good for combustion Quote Link to comment Share on other sites More sharing options...
DKilbourne Posted August 9, 2017 Report Share Posted August 9, 2017 Clean intake manifold is the goal. Oil vapor can't be good for combustion The excess oil that goes through is definitely not good. I used to have oil in the intake and inside the blower before doing this. Oil mist/vapor brings down the octane rating too. Quote Link to comment Share on other sites More sharing options...
Otis Nice Posted August 9, 2017 Report Share Posted August 9, 2017 This...I ran my PCV blocked off for years on a boosted engine. Granted...that engine did explode. Twice. :dumb: :lolguy: Quote Link to comment Share on other sites More sharing options...
Forrest Gump 9 Posted August 17, 2017 Author Report Share Posted August 17, 2017 Here's the reason why oil catch can is needed https://i.imgur.com/FGI3z1X.jpg Quote Link to comment Share on other sites More sharing options...
Suprafiedd Posted August 17, 2017 Report Share Posted August 17, 2017 I've seen it done four ways and some variations below: 1. PCV + additional line to a catch can vented to atmosphere 2. PCV + additional line to a catch can that is plumbed back into intake pipe pre-TB using the venturi effect (Speed density cars; I don't think you want to do this to a MAF car) 3. No PCV but separate lines off VC/crankcase to check valves in the exhaust to utilize the venturi effect. 4. No PCV but separate lines off VC/Crankcase to catch can vented to atmosphere. This may offer oil/fuel smell in or around the engine bay. I like No 2 and 4 the most and have used them in various high horsepower application. V8 guys love option 3 but the valves clog up over time (moroso makes a kit) The gain of the factory PCV is at low engine speeds as it draws the crankcase pressure back into the intake for better ring sealing and reduce stresses on engine seals (mains, cams, etc.). At higher engine load/speed it seals off that intake path. In some turbo cases, people have even put auxiliary vacuum pumps on the crankcase to help alleviate this known crank case pressure. Ironically it has helped more than anticipated at times due to promotion of better ring sealing/combustion. Quote Link to comment Share on other sites More sharing options...
iwashmycar Posted August 17, 2017 Report Share Posted August 17, 2017 Heck I just pulled this out of my lowly 4.0 N/A Toyota engine in just 6 weeks with my catch can. That's quite a bit saved from the intake in +/- 1000 miles http://i.imgur.com/mSKECcRl.jpg Quote Link to comment Share on other sites More sharing options...
Grudes Posted August 17, 2017 Report Share Posted August 17, 2017 Also NOS + Oil = holes in pistons Quote Link to comment Share on other sites More sharing options...
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