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Question to those who have added a filter/catch can to their CCV. I choose to do the mod as a closed loop so that I didn’t have to deal with oil messes and vapors. I installed a Provent 200 as an experiment to see just how much oil was being sucked into the intake of the engine. So, after 1000 miles I have dumped the catch can twice. Approximately after 500 miles each time. I am getting about 1 ounce of oil from the catch can. The miles on the truck have been my daily driving to and from work. I haven’t towed the 5ver since I added the filter. I knew that I was getting oil into the system since I clean the bottom CAC hose after each oil change. So, my question is what are you seeing in oil accumulation from your catch can?
I am not seeing any issues with the engine. Seems to be fine and runs great. I have about 152K on the truck. I have owned it for about 3 years now, and can’t say how the truck’s early days were, but since I have owned it, I have really been diligent on maintenance and upkeep.
Yes, I wanted a way to drain the canister easily. Plus the clear hose lets me see how much oil is in it. The drain hose holds about 12 ounces in total.
It seems clever... extending not only the capacity of your coalesced sump, but lowering the collection point.
As the air filter gets dirtier, the restriction in inches of Hg increases, and that vacuum can pull on the oil collected in the sump of the CCV filter canister.
It appears as if your employment of a valve on the end of a hose lowered the "sump" by 12 inches, which would seem to commensurately increase the headroom of air filter restriction by that many inches of hg, more or less.
Do you know how many liters per minute the ProVent 200 filter can flow? (I can look it up... I'm just lazy).
200 liters per minute, hence the ProVent 200. Duh. That was just too easy for me to remember.
The 200 is at least 50 liters short per minute on flow rate for that 6.4L monster of a motor, based on 350hp.
The more miles, and the older the 6.4 gets, the more flow rate capacity is needed for CCV.
Does the manual mention any filter bypass opening spec?
The ProVent 400 would be a better match up for that motor.
How much bigger in diameter is the ProVent 400 canister? Is it just longer, or is it also wider in diameter?
Sell your 200 to one of us old 7.3L crumudgeons with only 215hp to 235 hp. The 400 would better serve you.
Or at least a 280. Cummins/Fleetguard offers a 280 in a tall skinny cylindrical configuration... but not quite as compact as the Mann+Hummel 200 you have.
Yes, I kind of figured it was a little shy on capacity when I was putting the filter together for this experiment. Couldn't beat the price of the filter. $38 bucks on Ebay. In my thinking of this since I have had some miles on it now. If the filtration was not doing it's job, I would have some carry over out of the canister back into the inlet. I am not seeing this as the hose on the outlet of the canister is clean. If I was not pulling enough vacuum through the loop I wouldn't have oil accumulation, or as much as what I am seeing? This is where I am not sure. Am I getting to much oil out of the oil baffle and into the filter from some means? Not sure.
What you may not be seeing is increased crankcase pressure.
And that increase of crankcase pressure doesn't discriminate... it may find a point of escape that is more easily penetrable than the preordained means of escape through the filter. Like a seal.
The only way to know is to instrument the crankcase pressure and monitor it under a variety of conditions.
Interestingly enough, on an engine where this has been done extensively for a thesis project, the greatest (most positive) crankcase pressures were not at full load, hammer down, max fuel demand.
The plot graphing was sort of like a husband and wife shaking a sheet over a bed to make it... where the wife's name is Idle, and the husband's name is Max. The peak crankcase pressures were found somewhere between Idle and Max, like the parachute effect of Idle and Max shaking the sheet and then lowering it down to the bed. In other words, the pressure plot is not linear.
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