I'm not sure about the intake blow-by but piston blow by I can help with . If you know just a bit about cars you might know about the four stroke cycle. ( I hope). They are inatke, compresion, power, and exhaust. Basicly, the piston rings are there to hold compression during the compression stroke. Blow by is when the air (Fuel Mixture) that the piston is trying to compress blows-by the sides of the piston during the comprssion stroke, because of those worn piston rings that suround the piston (piston, piston, piston). Thats basicly whats going on. Unless you've got that other type. I'm not sure 'bout the other, I've never seen it.
