Exhaust system

Claim 1

IN A CRANKCASE VENTILATING SYSTEM FOR AN INTERNAL COMBUSTION ENGINE OF CONVENTIONAL DESIGN INCLUDING A CRANKCASE, AN OIL FILTER TUBE COMMUNICATING THEREWITH, AND A COMBUSTION AIR INDUCTION PASSAGE MEANS COMMUNICATING DIRECTLY WITH THE ATMOSPHERE FOR OBTAINING THE COMBUSTION AIR FOR SAID ENGINE; THE INVENTION COMPRISING: FILTER TUBE CAP MEANS TO PERMIT FLOW OF ATMOSPHERIC VENTILATION AIR THROUGH SAID FILLER TUBE TO SAID CRANKCASE, FILTER MEANS PROVIDED IN SAID CAP MEANS TO FILTER ATMOSPHEREIC VENTILATION AIR FLOWING TO SAID CRANKCASE, VALVE MEANS PROVIDED IN SAID CAP MEANS TO LIMIT FLOW TO ONE DIRECTION FROM THE ATMOSPHERE TO THE CRANKCASE AND PREVENT REVERSE FLOW, VENTILATING PASSAGE MEANS COMMUNICATING WITH SAID CRANKCASE AT ONE END AT A POSITION SPACED FROM THE FILLER TUBE TO ESTABLISH A FLOW OF VENTILATING AIR THROUGH THE CRANKCASE FROM THE FILLER TUBE, AND MEANS CONNECTING SAID VENTILATING PASSAGE MEANS TO SAID COMBUSTION AIR INDUCTION PASSAGE MEANS AT THE OTHER END WHEREBY PRESSURE DIFFERENTIALS EXISTING BETWEEN SAID COMBUSTION AIR INDUCTION PASSAGE MEANS AND SAID CRANKCASE WILL CAUSE A FLOW OF VENTILATION AIR AND BLOWBY FROM THE CRANKCASE TO THE COMBUSTION AIR INDUCTION PASSAGE MEANS FOR MIXING WITH THE COMBUSTION AIR TAKEN DIRECTLY FROM THE ATMOSPHERE.