One other disadvantage of the draft tube was the dropping of oil (that had
condensed from oil vapour?) onto the roadway.
Ron Beckett, J.P.
Emu Plains, Australia
1986 Range Rover HiLine Auto 4.6 Litre
1971 Hillman Hunter Royal 660
1985 Suzuki GS850GZ motor bike
1998 Holden Commodore Berlina V6
----- Original Message -----
From: David Kernberger <snip>
> Prior to either of these, there was
> usually an open tube directed downward to vent crankcase fumes directly to
> the air. Intake manifold vacuum was not used to suck the vapors out.
> Sometimes the bottom end of the tube was cut off at an angle which was
> supposed to cause some suction when the car was moving (venturi effect).
> These were called road draft tubes.
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