Canister reburn exhaust systems

Claim 1

An axial flow reburn canister system for an internal combustion engine having an electrical ignition system and a carburetor and having an exhaust pipe leading to a muffler, comprising a cylindrical casing of greater diameter than the exhaust pipe and having axially disposed inlet and outlet end portions shaped to couple into the exhaust pipe in advance of the muffler; at least one canister tube unit tranversely filling said casing and approaching its ends, said unit comprising a pair of spaced end plates peripherally welded to the casing and having perforations extending therethrough receiving the ends of canister tubes which are welded therein, whereby the exhaust gases must pass through the canister tubes on their way to the muffler; the casing having an axial space located downstream of one of the end plates to provide an exhaust reburn chamber; axially-spaced transversely disposed baffle plates within the chamber spaced downstream of said one end plate, each baffle plate covering substantially three-fourths of the cross-sectional chamber area and being shaped to provide a zig-zag path through the chamber; at least one spark plug in said chamber disposed between the baffle plates and connected in the ignition system; means for admitting air into the casing at the inlet end portion of the casing; and means for returning burnt gases from the downstream end of the chamber to the carburetor.