2008 IS250.
I am thinking about adding a catch can by splicing the PCV hose to capture oil/fuel/water vapor to reduce / eliminate the intake valve deposits that causes engine problem (stalling, stumbling when starting, etc), after the extended warranty expires at 10 years 100k miles.
If I understand correctly, the fuel vapor has a lower boiling and flash points than water vapor, and water vapor has a lower boiling and flash points than oil vapor. So in order to condense fuel vapor inside the catch can I will have to keep the catch can temperature cool enough that water would condense along with fuel, potentially collect a lot of water if I do not want it in my intake.
I am thinking about having some check valve in the can so when there is no vacuum, the collected water would drain outside the car via a hose to a container outside, or keep the temperature high enough so the water vapor and fuel vapor would be sucked back into the intake and drain only the oil back to the sump.
The setup would be a hose coming from the valve cover that split into 2 paths, 1 toward the input of the catch can, 1 to a check valve (i.e. a PCV in reverse direction) that would drain oil back into the engine. The output of the catch can would just go into the intake as it would be in a normal PCV setup. If I can do this I do not need to ever dump the fluid between oil change again; it would be perfect.
So how do I control the temperature of the catch can to "distill" the right fluid? and how do I keep it cool under the hood? I can think of some elaborate cooling mechanism, like putting the catch can inside another container with air feeding into the crankcase (from air before throttle body). This air should be cool enough to shield the catch can from under hood heat. However this would dramatically increase the size of the catch can and vacuum plumbing complexity.
Am I over engineering this for a non turbo car just to get rid of intake valve deposit?
I am thinking about adding a catch can by splicing the PCV hose to capture oil/fuel/water vapor to reduce / eliminate the intake valve deposits that causes engine problem (stalling, stumbling when starting, etc), after the extended warranty expires at 10 years 100k miles.
If I understand correctly, the fuel vapor has a lower boiling and flash points than water vapor, and water vapor has a lower boiling and flash points than oil vapor. So in order to condense fuel vapor inside the catch can I will have to keep the catch can temperature cool enough that water would condense along with fuel, potentially collect a lot of water if I do not want it in my intake.
I am thinking about having some check valve in the can so when there is no vacuum, the collected water would drain outside the car via a hose to a container outside, or keep the temperature high enough so the water vapor and fuel vapor would be sucked back into the intake and drain only the oil back to the sump.
The setup would be a hose coming from the valve cover that split into 2 paths, 1 toward the input of the catch can, 1 to a check valve (i.e. a PCV in reverse direction) that would drain oil back into the engine. The output of the catch can would just go into the intake as it would be in a normal PCV setup. If I can do this I do not need to ever dump the fluid between oil change again; it would be perfect.
So how do I control the temperature of the catch can to "distill" the right fluid? and how do I keep it cool under the hood? I can think of some elaborate cooling mechanism, like putting the catch can inside another container with air feeding into the crankcase (from air before throttle body). This air should be cool enough to shield the catch can from under hood heat. However this would dramatically increase the size of the catch can and vacuum plumbing complexity.
Am I over engineering this for a non turbo car just to get rid of intake valve deposit?
