Quote:
Originally Posted by Kingtal0n
Catch cans are more for old engine's with blow-by, or as a safety precaution for when your piston rings come apart and you start pushing quarts of oil out the valve cover. A high performance "Raceing engine" that is warmed up properly, has round cylinder (because deck plate) and the right piston-wall clearance (because mazworx) with the right grade oil should not produce significant amounts of blow-by.
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I'm not sure where in your head you determined catch cans are strictly for old, poorly assembled or unhealthy engines. Either way that's your personal opinion and you're entitled to it.
If you pull a vacuum on your crank case, regardless of the quality of build you have, you are going to pull oil vapor out of it. If one doesn't want to have that oil vapor go back into their motor, lowering octane ratings and potentially damaging their motor, guess what? They add a catch can. Sure, it won't stop all, but it will prevent most from entering your engine.