Jzachlee 1st Gear August 9, 2021 Share August 9, 2021 Hi gurus, Can anyone tell me what does this tubing do? It seems to be connected to the air intake. This is the KIA K3 Forte engine. Many thanks in advance. ↡ Advertisement Link to post Share on other sites More sharing options...
Hamburger Hypersonic August 9, 2021 Share August 9, 2021 Oily air within cam cover recirculate back to the combustion chamber instead of letting back in the atmosphere to prevent pollution. 3 Link to post Share on other sites More sharing options...
Jzachlee 1st Gear August 9, 2021 Author Share August 9, 2021 (edited) Okay, did some research and found out what it is. It is the breather hose. Item B in the illustration below. Edited August 9, 2021 by Jzachlee 1 Link to post Share on other sites More sharing options...
Jzachlee 1st Gear August 9, 2021 Author Share August 9, 2021 3 minutes ago, Hamburger said: Oily air within cam cover recirculate back to the combustion chamber instead of letting back in the atmosphere to prevent pollution. Thank you! Link to post Share on other sites More sharing options...
ER-3682 Twincharged August 9, 2021 Share August 9, 2021 You think extra hose from a Compressor.? Link to post Share on other sites More sharing options...
Kb27 Supersonic August 9, 2021 Share August 9, 2021 try not to modify or damage the breather hose. if you do, your engine compartment may become very oily. 2 Link to post Share on other sites More sharing options...
ER-3682 Twincharged August 9, 2021 Share August 9, 2021 7 hours ago, Kb27 said: try not to modify or damage the breather hose. if you do, your engine compartment may become very oily. Also Pollution & bad smell. Link to post Share on other sites More sharing options...
Watwheels Supersonic August 9, 2021 Share August 9, 2021 PCV(positive crankcase valve) return hose. Basically what it does is let the engine oil vapour and petrol vapour mixture get return thru the air intake. It will make your throttlebody sticky and how air intake valves are dirty is because of this stupid design. I dont understand why it cannot go straight to the lower oil pan. I use my own "delete kit" and use a breather instead. Put a stopper on the intake hose. There is no smell or oil contaminants around the engine. I used it on two cars already. My car's engine is NA so not much of the rubbish vapour will flow out of the PCV return hose(the condition of your engine oil matters). Even for my previous car which is TC I also dont find much vapour on it but if you let it flow back into the air intake manifold it will slowly accumulate and dirty the throttlebody and air intake valves. For TC engines the rubbish vapour will flow thru the intercooler...stay trapped inside maybe (cos when the vapour is cooled it goes from gas state to liquid state), flow thru and damage your MAP (boost sensor) sensor. It is more of a mess for TC engines cos of additional blowby ... The MAP sensor has to be replaced every 2-3 years, maybe earlier. Alternatively you could do an oil catch can but I think that is a waste of time. A delete kit and a breather is maintenance free. I know how to revert things back to stock so when going back for service or car inspection it is not a problem for me. ↡ Advertisement 2 Link to post Share on other sites More sharing options...
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