Rx Catch Can results
05-19-2014, 12:15 PM
#11
Senior Member
05-19-2014, 12:44 PM
#12
Just Another Member
05-19-2014, 01:01 PM
#13
Senior Member
For starters, I believe the “ugly gunk” to be mostly a mixture of oil (mist in the crankcase pulled or pushed out) and water (normal combustion byproduct leaked past rings), with a smaller amount of fuel and other trace compounds.
Let’s break down some numbers. The OP captured about 4 oz of liquid in 1000 miles. In that same 1000 miles, the engine consumed about 7500 oz of liquid fuel. Most of the catch can “gunk” is combustible and will burn along the fuel. Your engine will also consume about 1800 oz of atmospheric moisture in that time. Therefore, the “ugly gunk” only consitutes about 0.04% of the total water and hydrocarbon liquids ingested by the engine. During that same time, the engine processed about 130,000 oz of air. The same math reveals that the “ugly gunk” is only about 0.003% of the total mass consumed by the engine, about 30 ppm, or 6 drops in a bucket. Those are pretty low numbers.
Just keep in mind that most, if not all, of the road vehicles manufactured in the last 30+ years pull PCV products into the inlet air stream. The F-150 is not unique in that regard. The OEM’s needed to process vapors from the crankcase somehow and figured the best place to send them is the incinerator.
Let’s break down some numbers. The OP captured about 4 oz of liquid in 1000 miles. In that same 1000 miles, the engine consumed about 7500 oz of liquid fuel. Most of the catch can “gunk” is combustible and will burn along the fuel. Your engine will also consume about 1800 oz of atmospheric moisture in that time. Therefore, the “ugly gunk” only consitutes about 0.04% of the total water and hydrocarbon liquids ingested by the engine. During that same time, the engine processed about 130,000 oz of air. The same math reveals that the “ugly gunk” is only about 0.003% of the total mass consumed by the engine, about 30 ppm, or 6 drops in a bucket. Those are pretty low numbers.
Just keep in mind that most, if not all, of the road vehicles manufactured in the last 30+ years pull PCV products into the inlet air stream. The F-150 is not unique in that regard. The OEM’s needed to process vapors from the crankcase somehow and figured the best place to send them is the incinerator.
Again, exactly what kind of engineer are you?
05-19-2014, 01:07 PM
#14
Senior Member
Mostly because you have no idea how the auto industry works! There are a lot of variables as to "why" Ford would not add a catch can. Among them are cost vs. expected vehicle life, regulations, etc. Second, you do NOT drill into the PVC system with the RX catch can install. You drill into the charge pipes, which are about $75 for the pair! This modification will not affect warranty any more or less than any other modification!
05-19-2014, 01:19 PM
#15
05-19-2014, 01:22 PM
#16
Lets all step back. Take a breath.
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engineermike (05-19-2014)
05-19-2014, 02:12 PM
#19
Just Another Member
Mostly because you have no idea how the auto industry works! There are a lot of variables as to "why" Ford would not add a catch can. Among them are cost vs. expected vehicle life, regulations, etc. Second, you do NOT drill into the PVC system with the RX catch can install. You drill into the charge pipes, which are about $75 for the pair! This modification will not affect warranty any more or less than any other modification!
And I don't think I mentioned RX at all, but if you say that's true for the RX can, it's good to know. In any case, I've spoken with several (3) Ford dealers about drilling into the air and fuel delivery systems and they've said that's a definite warranty killer. It's good that "charge pipes" are cheap so you can replace them if you need to. I can't verify that because "charge pipes" are not listed on the Ford Parts web site, so I'll take your word for it. Maybe you have more lenient dealers around you than I have near me.
So thanks. Enjoy your catch can.
05-19-2014, 05:51 PM
#20
Senior Member
No I am not saying that air is not part of the combustion process. The combustion in a DI engine does not occur in such a way to burn off contaminates like an N\A engine!