Exhaust system for vehicle

1. An exhaust system for operating in rain a vehicle having an engine which emits exhaust gases through an exhaust manifold, the exhaust system comprising:

an exhaust passageway of a singular pipe having a proximate end fluidly connected with the exhaust manifold for receiving exhaust gases from the engine, and a distal end for emitting exhaust gases to atmosphere and through which the rain may enter the exhaust passageway;

said exhaust passageway of the singular pipe defining an interior passageway surface and an exterior passageway surface;

said exhaust passageway having at least a portion thereof with a vertical vector such that fluid entering the distal end of the passageway may flow downwardly along the interior passageway surface under the influence of gravity toward the intake manifold;

said exhaust passageway of the singular pipe having at least one outwardly protruding bead portion formed therein intermediate of the proximate end and the distal end of the singular pipe;

the bead portion having an upper portion and a lower portion;

said bead portion being disposed on a vertical vector portion of the exhaust passageway and having one or more open drain holes therein on a lower portion of the bead through which at least a portion of water in the bead may be released from the interior of the exhaust passageway prior to flowing further in a downward direction past the bead portion of the exhaust passageway.

2. An exhaust system in accordance with claim 1 in which the the singular pipe defines a longitudinal axis at the location of the bead and the bead extends radially outwardly relative to the longitudinal axis.

3. An exhaust system in accordance with claim 1 in which the bead portion is configured to collect at least a portion of the rain flowing downwardly along the interior passageway surface of the exhaust passageway of the singular pipe before the rain flows through the one or more open holes.

4. An exhaust system in accordance with claim 1 in which the bead portion is disposed on a vertically extending section of the exhaust passageway of the singular pipe.

5. An exhaust system in accordance with claim 1 in which the bead portion is disposed on a section of the exhaust passageway which extends at an angle between horizontal and vertical.

6. An exhaust system in accordance with claim 1 in which the bead defines a semi-circular configuration.

7. An exhaust system in accordance with claim 1 in which the exhaust passageway is used on a vehicle which may travel in a given driving direction, such that the exhaust passageway defines a forward side in the direction of vehicle travel and a rearward side opposite the direction of travel, and at least a portion of the one or more holes in the bead portion are disposed on the rearward side of the exhaust passageway.

8. An exhaust system in accordance with claim 1 in which the bead portion and holes are configured to prevent any rain from flowing downwardly along the interior passageway surface past the bead portion.

9. A singular exhaust pipe for use with an engine which emits exhaust gases through an exhaust manifold, comprising:

a fluid exhaust passageway defining an interior surface and an exterior surface, and having a proximal end fluidly connected with the exhaust manifold for receiving exhaust gases from the engine, and having a distal end for emitting exhaust gases to atmosphere and through which rain may enter the exhaust passageway;

said exhaust passageway having at least a portion thereof with a vertical vector such that the rain entering the distal end of the exhaust passageway may flow downwardly along the interior surface of the fluid exhaust passageway toward the intake manifold;

said internal surface of the exhaust passageway defining one or more circumferentially disposed and outwardly extending grooves, with the one or more grooves having an inner surface which extends to an outer diameter greater than the outer diameter of the internal surface of the exhaust passageway proximate the one or more grooves on either side thereof, such that the rain flowing downwardly along the interior surface of the fluid exhaust passage flows into the one or more outwardly extending grooves;

at least one open hole in the outwardly extending grooves through which rain flowing into the one or more grooves may pass out of the exhaust passageway such that at least a portion of the rain entering the proximal end of the exhaust passageway may be prevented from passing downwardly below the one or more grooves of the exhaust passageway.