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   Emissions and Crankcase Ventilation 
     Breather System Design #3
           Larger Separator Tanks and an exhaust pressure scavenging System

   Emissions and Cranckcase Ventilation Issues

Home   Research and decision making    Standards and calculations    Exhaust scavenging     D-I-Y   
    These breathers are tricky. How do you pull the oil out of the air stream without creating back pressure. Plus... how do you remove the collected oil from the separators.  Well, that WAS one of my original design parameters... to facilitate, oil return to the crank from the breather system.   So this third series of breather/separators were built.

breathermodel3a.jpg (18846 bytes)          breathermodel3b.jpg (13454 bytes)

    These units were built up with a oil return line at the bottom of the containers.  The oil return line actually protrudes into the engine block. This is to allow the oil to drain out, and limit the effects of the vacuum pulling on the canister.  These models were to test various ratios of breathing to the various ports.  The one on the left/top, in the above two photos was made from half a Propane can. (see next photos)

breathermodel3ainside1.jpg (16589 bytes)

breathermodel3ainside2.jpg (11796 bytes)

   The tall pipe, welded directly to the bottom square horizontal tube, was designed to have the rocker breather pipe, dump its oil to the bottom of the separator/breather, but allow the air to escape to the main tank out the side holes.  The top center pipe, has multiple holes in it's insided end, with the end slightly smashed flat.  This is the high-vacuum port.    The port on the side allows over-pressure to vent via the small filter if needed.  On this one, the oil return line is welded into the top of the large square tube (the floor of the main canister) This allows the accumulated oil to drain out and back into the crankcase all by itself.  So I don't have to remember to empty catch cans and such.

steelwool4.jpg (8942 bytes)

   I stuffed #4 steel wool inside as the main separator media.  The stuff looks like Shredded Wheat. When you unravel a 'biscuit' the stuff REALLY fluffs up.  At least the #4 steel wool doesn't burn with a  propane torch like the aluminum screen cooking stove vent screen material, or the house window screen I first tried in previous models.

   You'll notice here the brass pipe routing the rocker vent down to the separator tank.  You'll also notice a 'larger' pipe on the center separator port, that seems to dissappear under the heater valve. 

    With this '3a' version, I introduced a new trick! A new source of vacuum. An exhaust scavenging system!

  This is also a good shot of the extra vent filter added during model #2.

breathermodel3flowroute3.jpg (28745 bytes)


   Emissions and Cranckcase Ventilation Issues

Home   Research and decision making    Standards and calculations    Exhaust scavenging     D-I-Y   

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