That's all assuming that a well-designed baffled breather tank is used to get the vapor to turn to liquid. Part of the reason why it's going in the fender to help cool the vapors. My current catch can is just letting those vapors float right out the top through the breather.How does that change the fact that vapor makes it past the filter? My -12 line has to travel 30" forward, then another 30" back before it gets to the breather tank.
My engine obviously brand new and unbroken in,....but mine still smokes like a chimney.