[DeTomaso] Crankcase Evacuation System

[JDeRyke at aol.com]

As has been mentioned, a racing crankcase evacuation system makes use of 
exhaust flow rather than carb vacuum, to draw air/fumes in from the crankcase 
and blow them out the exhaust. This obviously inactivates all smog 
attachments and only works at higher rpms. The vacuum pulled can be strong enough to 
invert crankshaft seals front and back so at low engine speeds, you get no 
suction and new oil leaks start. 
It also picks up oil mist and can vastly increase oil useage unless an 
air/oil separator with a return is added (not usually part of racing systems). 
It can remove enough oil mist that ring, cylinder wall, cam and wristpin wear 
increase quite a bit unless the engine is specifically designed for such a 
system. It really doesn't increase engine power; racers like them mainly 
'cause if an oil leak starts, an evacuation system will prevent oil from 
hitting the track and getting them black-flagged. FWIW- J Deryke