If you think you can tune around this you are correct, sort of. If you do not route the PCV back into the intake manifold then that calculated air is “poof” let out into space causing your fuel trims to be off. Metered air passes through the MAF sensor before entering the engine, then a small amount is passed by the rings and enters back into the intake or intake manifold. It only makes sense that the opposite would be true about getting it out and it would be much easier to achieve under vacuum.Ģ. Think of how much easier it is to get air into the motor under pressure (ie turbo). Without the vacuum the vapors can only be forced out by the pressure in the crankcase. The intake vacuum helps draw vapors out of the motor by creating a low pressure system to force the vapors out. Yes, you might sleep at night better knowing you are not hurting the environment but this is not the only reason to plumb the catch can back into the intake.ġ. There are several reasons this is a bad idea and being friendly to mother nature is only one of them. So why not cap the intake and the intake manifold and have it vent to atmosphere? Now, the CorkSport Catch Can will be working to eliminate those vapors all of the time without the restriction of a PCV valve to prevent it from being able to remove contaminates while your car is under boost. We decided to cap the intake manifold and pull vacuum through the intake so both cam and crank case vapors are trapped in the OCC leaving your motor the cleanest it can be. Instead it is just sitting there waiting for the PCV valve to open back up.
When your car is under boost is the time the catch can should be working the hardest to prevent those contaminates from entering your engine.
We noticed that by adding the PCV check valve to the oil catch can, the OCC worked less effectively because when the check valve closes (the car is under boost) the catch can is no longer able to do the same job of “catching” the vapors. So why does CorkSport no longer have a Check Valve on our Oil Catch Can setup? This is a great question. Most Oil Catch Cans include a PCV valve in the set-up for turbo vehicles, as ours did until just recently. Improving the Design of the CorkSport OCC Why the two locations you ask? Well they go to the closest vacuum source, but in a turbo car you will not have vacuum when you are in boost so a check valve closes and stops the crankcase from being pressurized and boost being lost. One goes from the cam cover to the intake and one goes from the crank case to the intake manifold. With no catch can installed, you have the potential to get build up in the intake manifold causing dirty valves and poor compression.Ī Mazdaspeed 3 has two PCV lines. There are also small amounts of condensation that get trapped in the crankcase and you don’t have to be a rocket scientist to know water and oil don’t mix.Īn oil catch can is designed to “catch” unwanted vapors that are in your crankcase and PCV system and prevent these contaminates from entering your motor. This excess air will cause pressure in the crankcase to slow down the pistons from going up and down and build up oil vapors that create frothing of the oil. There is a small amount of compression that is lost into the crankcase passing by the rings. When the engine is running, the pistons are happily moving up and down. Most understand the basics of what the OCC does, but want to know more about how our OCC does it.įor the last 20 or so years, all cars have had some sort of PCV system installed to re-burn unwanted vapors from your crankcase instead of venting them to the outside world. Since the release of our Oil Catch Can we have had a lot of questions about how our set-up functions.
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