002 breather

[Jimc]

Just an unimportant question/observation....I notice the 002 has a crankcase ventilation system on it. A small canister with a hose that runs to the intake. I just find it strange that the 002 has this but the 003 does not. Anyone got any idea why?

 

[massey]

From what I understand, the crank on the 002 has both pistons going up and down together creating a lot of windage/pressure in the crankcase. The 003 always has two moving up and two moving down somewhat balancing out the pressure created by the piston movement. In my 002's pulling the dipstick while it's running even with the breather results in a fine mist/splatter from the dipstick tube (leak down on both is negligible), while the 003 there is no pressure or mist with the dipstick pulled while running.

 

[Jimc]

Massey that makes perfect sense and i never really thought of that. Thanks!