Turbo jet muffler

A muffler comprising:

• a body defining a chamber having an inlet side and an exhaust inlet to the inlet side of said chamber adapted to be coupled to an internal combustion engine;
• said inlet terminating in said chamber in a porous pipe;
• means defining at least one constricted outlet opening from said chamber for exhaust gases;
• means in said constricted outlet opening including a plurality of helical vanes for imparting helical flow to exhaust gases exiting said chamber;
• means including at least one opening in the inlet side of said muffler body for introducing ambient air into said constricted opening adjacent the helical flow exhaust gas flow for mixing with the exhaust gases;
• means defining a tailpipe section for exhausting exhaust gases;
• and
• venturi means communicating with said constricted outlet opening and said tailpipe section defining means.

A muffler comprising:

• a body defining a chamber having an inlet side and an exhaust inlet to the inlet side of said chamber adapted to be coupled to an internal combustion engine;
• means defining an outlet opening from said chamber;
• said inlet terminating in said chamber in a pipe having a porous section for diffusing exhaust gases into said chamber, said exhaust inlet, said chamber and said outlet opening means constituting a flow path for said exhaust gasses;
• means including a plurality of helical vanes in one of said chamber and said outlet opening means for imparting helical flow to exhaust gases in said flow path;
• a body of sound absorbing material in said chamber and porous wall means retaining said sound absorbing material in place;
• venturi means in said flow path between said helical vanes and said outlet opening means;
• and
• means including at least one opening in the inlet side of said muffler body for introducing ambient air into said helical exhaust gas flow downstream of one of said venturi and said outlet opening means for mixing with the exhaust gases.