Quote:
Originally Posted by gmsii
well dont really want to slog through all that....feel free to give me the cliff notes.
if we use race cars as empirical evidence, i would dare say practically none of them recirculate oil vapors back into the intake tract. even a dry sump system pulling highlevels of crank case vacuum has a oil tank that vents to atmosphere. yes, you need to figure out a way to relieve crankcase pressure, but oil vapors can cause detonation and gunk up motors...thats why you dont recirculate oil vapors
i can only think of one instance where you would want crank gasses recirculated into the intake tract and that is when drag racers mix nitro into their oil and recirculate the crank/nitro vapors for a power gain.
from a performance perspective, the best to worst the strategies for venting the crank case would be:
drysump pump venting to atmosphere
vacuum pump venting to atmosphere
catch can venting to atmosphere
direct mounted breather venting to atmosphere
PCV recirculation
non vented
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The two bolded options are the only things I have a difference of opinion on. Otherwise I agree. And I should add, I believe those two options should be reversed for a daily driver. If we're talking about a race car than I completely agree.