Quote:
Originally Posted by tunermt
Vent to atmosphere is extremely common set up you haven?t ever seen something?s like that before? Very easy way to keep crank case pressure low while keeping all blow by fumes out of the engines combustion cycles. Only time I?d ever recirculate to intake would be for emissions inspection.
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I am not picking on you! I just want you to understand how pcv works so that you can properly care for your engine. I want you to have a very healthy and clean engine.
You are not keeping the crank case pressure low if you don't have pcv lol
When you run an engine, any engine, it creates blow by, which raises crankcase pressure above atmospheric
So say atmosphere is sea level 103KPA
When the engine starts there, with no pcv, the crankcase pressure will be higher than 103KPA for the entire time it runs.
This puts additional pressure on oil seals (creates oil leaks) and reduces the ring-seal (increased blow-by).
This also allows combustion byproduct easy access to engine oil which quickly becomes contaminated and broken down as partially combusted hydrocarbon fragments dissolve
You should never run an engine like that.
-Daily drivers use active manifold suction (for simplicity and low maintenance)
-Race cars use a vacuum pump
Sometimes these are combined with an active-exhaust venturi driver or electric pump but that is rare and adds complexity
heres a picture, pay close attention to the exact pressure numbers KPA, and the bottom where it shows with and without pcv in terms of KPA
You want to be below the yellow line (at sea level, 101.xKPA) at all times, typically 1 to 2.2" Hg or roughly 12-25" of water (its easier to set pcv using inches of water as a measurement)