On a direct injected engine this results in faster carbon buildup on the intake valves. The theory is, that said vapors can coat all along the inside of the intake manifold and attract crud, in addition to intake valves and just generally mucking things up. These vapors aren't quite as easily controlled as fuel is, in terms of combustion. It's primarily for emissions.Īnyway, these gasses bring oil vapors along with them. The PCV is an enclosed system the pulls blow-by gasses (ie gasses from combustion that slip by the piston rings and into the crank case) from inside the crankcase, back through the intake manifold, and into the combustion chambers so it all can be burnt up, as opposed to just venting it all into the atmosphere (evidently they did just that back in the day). The idea behind using a catch can has been around for quite some time but more recently it has become popular again because of direct injection engines.
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