Catalytic converter having a venturi formed from two stamped com

Details Catalytic converter having a venturi formed from two stamped com Catalytic converter having a venturi formed from two stamped com

1994-10-19

1996-08-27

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

60308, 422180, F01N 328

Patent

active

055489559

ABSTRACT:
The catalytic muffler for small internal combustion engines has a venturi with a flattened profile formed from two stamped pieces, namely the muffler housing and the separator plate. This design eliminates the need for a separate piece of tubing or machined part, as is required in prior art round venturi devices. The catalytic muffler also includes a noise attenuator disposed upstream of the catalyst, thereby eliminating the back pressure which is otherwise applied to the venturi when the noise attenuator is disposed downstream of the catalyst. In addition, back pressure on the venturi is reduced by sizing the port in the separator plate and the exhaust port so that their respective cross sectional areas are substantially equal to the cross sectional area of the catalyst.

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