Quote:
Originally Posted by BlackZenkiS14
I'm not going to argue, and really don't care if you use an empty beer bottle for a "catch can" , and do nothing to to pull vacuum in your crankcase.
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The pipes are called breather pipes for a reason; pressure goes up and down with every piston movement.
Unless you are really building pressure badly in your crankcase, you dont need to pull vacuum. You need to equalize pressure between crankcase and head, to avoid oil pooling up there and thats it.
Crankcase pressure becomes a problem when it goes so high it cant equalize, and it blocks oil from going back to the crank case. That happens when rings dont do their job anymore, which means your engine either needs a rebuild or you are pushing some tons of boost. I am talking 700+ HP territory here.
I know the current trend is all about oil mist, catch can, crank scrapers and so on. But guess what ? You dont need all that. Sure, it is "better", but the question is "do you need it". And the answer is "no". You may want it because it is trendy, it looks cool, or just any other reason, but you dont need it.
Quote:
Originally Posted by BlackZenkiS14
But for my engine, I want better, and a properly setup closed loop catch can is probably on the list.
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Then go dry sump. It is even better. Dont tell me you dont need it; you dont need the closed loop catch can either. and you dont need the vacuumed crankcase either.
Yes, sure, vacuum is better, as oil gets sucked down to the crankcase instead of just using gravity. But do you have oil pooling in the head ? If the answer is no, then you dont need vacuum, it is simple as that.
And if you want the ultimate engine tech ... buy a race engine. these usually come with dry sump and cylinders have "walls" on the bottom, and various pressure equalizing system. They are designed to take a beating and output high HP somewhat reliably, to an extent no one can reach with the engines we use.
TL;DR:
Yes vacuum is better, but you dont need it.