There is some blowby in all engines no matter how perfect they are. On big V twins, or ant two cylinder engines the pressure increases due to piston size.izaakb said:Where does the crankcase pressure come from? Ring blowby?
How much pressure can really build up? I've never heard of a huge issue with it unless your rings are totally shot.
What most of us remove is the evaporative canister, the juice can by the wishbone on older monsters and the plastic box on the newer ones. Pod air filters require the removal of the breather box. If the breather box is removed a K&N or similar filter is used and the price paid is higher crankcase pressure since you do not have the negative pressure in the airbox to help scavenge. The effect is not very significant so the choice becomes yours. If you go that route I suggest mounting the filter high as there is a (slim) chance you could oil your back tire.JSHoward11 said:If this is the case, then what does everyone install when they remove the stock emissions equipment???