Dzowani Posted August 30, 2017 Share Posted August 30, 2017 I recently purchase a catch tank from ebay with a air filter attached. I know you fit one of the hose's to the right side of the Valve cover. Where should i attach the other one? I seen people fit the hoses on both sides of the valve cover? Or should i attach it to the intake? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted August 30, 2017 Share Posted August 30, 2017 Personally i don't like an engine to breath its own oil fumes so i block the hose to the PCV valve then make damned sure the cam covers are well vented (both) to the oil catch tank, which then vents itself to atmosphere. Some claim the PCV system gives some negative crankcase pressure (partial vacuum), to the betterment of ring sealing. the ONLY times I have seen this achieved is on race engines with whopping scavenge pumps and de-aerators that can pull a vacuum. A blown engine, be it super or turbo charged, needs this most when under boost, and of course at such a time the PCV valve is closed, otherwise the crankcase and rest of the engine internally, would be at full boost pressure. On RB26 DETT engines I drain the catch tank back to the sump with a low, very low, spring pressure flap valve, as they are notorious for filling catch tanks with blow by oil as drainage of the cam boxes is iffy, and oil mist is blown out to some tune. This is not the case with a healthy 2JZ, (or 1JZ) that has exemplary head to sump oil drainage. In fact, with RB26's I make a drain from off the back of the head, from a core plug hole that is at the bottom of the upper casting, to drain more oil direct to the sump via a -12 aeroquip hose and a sump fitting. http://www.gatesgarth.com/RB26_Race_Engine3/rb26.html Quote Link to comment Share on other sites More sharing options...
Dzowani Posted August 30, 2017 Author Share Posted August 30, 2017 (edited) Soooo connect both catch tank hoses to both sides to the valve cover and then the 3 one to the intake??? Edited August 30, 2017 by Dzowani (see edit history) Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted August 30, 2017 Share Posted August 30, 2017 No, to the outside air, NOT to the intake! You greens, you try so hard Quote Link to comment Share on other sites More sharing options...
Dzowani Posted August 31, 2017 Author Share Posted August 31, 2017 No, to the outside air, NOT to the intake! You greens, you try so hard Hmmm don't know if you're haveing a laugh at me or beaing serious I'm confused can anybody help me Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted August 31, 2017 Share Posted August 31, 2017 Serious, vent all internal air / fumes to atmo, not back into the intake! Quote Link to comment Share on other sites More sharing options...
T2 MSW Posted August 31, 2017 Share Posted August 31, 2017 Yep as Chris says vent the left and right cam covers to the oil catch can and block off any links that go into the intake. Quote Link to comment Share on other sites More sharing options...
wrighty338 Posted August 31, 2017 Share Posted August 31, 2017 I wouldnt VTA under the hood via that little air filter, id pipe it downwards somewhere.. Quote Link to comment Share on other sites More sharing options...
a98pmalcolm Posted August 31, 2017 Share Posted August 31, 2017 (edited) Why not catch tank then into the intake? Thats were mine go, loads of people do it. I see people do it with no catch tank at all Reason I ran from catch to the intake was the smell from the heater vents was unbearable due to it venting under the hood. Edited August 31, 2017 by a98pmalcolm (see edit history) Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted August 31, 2017 Share Posted August 31, 2017 Because oil fumes effectively dilute the fuel octane and contaminate the engine oil. (The engine thinks it smells bad too, IYSWIM). If you just want a sanitary installation just leave the thing as stock, if you want to keep effective fuel octane as high as possible and engine oil contamination as low as possible, do it as I said earlier. Car makers would love to vent to atmo, but there's no way they would pass emission testing (unless they are VAG perhaps?). Quote Link to comment Share on other sites More sharing options...
a98pmalcolm Posted August 31, 2017 Share Posted August 31, 2017 Because oil fumes effectively dilute the fuel octane and contaminate the engine oil. (The engine thinks it smells bad too, IYSWIM). If you just want a sanitary installation just leave the thing as stock, if you want to keep effective fuel octane as high as possible and engine oil contamination as low as possible, do it as I said earlier. Car makers would love to vent to atmo, but there's no way they would pass emission testing (unless they are VAG perhaps?). Thanks for the explanation Chris, leaving the ventilation stock is a little out out of the question as I'm single turbo and after market inlet. Its all mapped to that set up, i wonder if that would eliminate what the engine thinks? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted August 31, 2017 Share Posted August 31, 2017 If you find the fumes are getting into the interior best leave it as it is, venting to atmo is something I do to all my cars as the oil stays so much cleaner, but yes, you can sometimes smell hot oil Quote Link to comment Share on other sites More sharing options...
Sheefa Posted August 31, 2017 Share Posted August 31, 2017 Vented to atmosphere here. I had a catch tank installed but SRD kindly removed it and a much cleaner (for me and the engine!) setup. It's not like you're leaving plumes of oil residue when out to atmosphere either ! Quote Link to comment Share on other sites More sharing options...
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