stock air filter vs. simota or K&N

[niky]

They're supposedly life-time, but if they get crumpled or squashed, or some idiot pokes a hole in one with a screwdriver, you'll still need to replace them.

[baludoy]

what are breathers for? are they standard stuff for aftermarket air filters?

[niky]

Crankcase breathers. So you don't have to deal with crankcase recirculation into your intake tube. They're common with old Simota kits because the universal tubes they had didn't have bungs for the PCV hoses.

I haven't experienced any problems with them in the past, but it's always best if your kit has a PCV line attachment.

[baludoy]

Crankcase breathers. So you don't have to deal with crankcase recirculation into your intake tube. They're common with old Simota kits because the universal tubes they had didn't have bungs for the PCV hoses.

I haven't experienced any problems with them in the past, but it's always best if your kit has a PCV line attachment.

ano po ang pcv?

correct me if i'm wrong bos, but i'm getting the impression from your post above that the newer models of simota and knn (and other brands for that matter) do not require or need breathers anymore, sir?

[niky]

PCV = positive crankcase ventilation. Air is recirculated from the valve cover to the intake hose to prevent buildup of hydrocarbon residue (which causes sludge) inside the engine.

It's not the type of filter that dictates whether you need to place a breather on the PCV valve. It's the tube. If you replace your stock intake tube with an aftermarket one that has no bung for the PCV hose, then you need a breather. You can't just seal up the PCV connection on the valve cover (or wherever it is, on your engine) as this is bad for your engine.

Of course, it's also bad to have a breather, as this vents unburned hydrocarbons into the atmosphere... causing more pollution. Thus, most modern intake pipes have bungs for these hoses.