Exhaust gas discharge system for two-stroke internal combustion engine

Patent · Tue Apr 07 04:00:00 EDT 1992

OSTI ID:5030867

Blair, A J

This patent describes a two stroke internal combustion engine. It comprises first, second, third, and fourth cylinders which sequentially fire in the stated series and at an even firing interval of 90{degrees} and which include respective first, second, third, and fourth exhaust ports which open and close in response to piston movement, and an exhaust gas discharge means communicating with the exhaust ports, including a duct portion, and being operable, in response to firing of the second cylinder and opening of the second exhaust port, to afford passage of exhaust gas from the second exhaust port so as to provide an outgoing positive acoustical pressure wave which travels in the duct portion and which arrives at the first exhaust port prior to closure of the first exhaust port and to provide a returning negative acoustical pressure wave which travels in the duct portion after substantial completion of the travel of the outgoing positive acoustical pressure wave in the duct portion and which arrives at the second exhaust port prior to closing of the second exhaust port.

• Assignee: Outboard Marine Corp., Waukegan, IL (United States)
• Patent Number(s): US 5101626; A
• Application Number: PPN: US 7-554542
• OSTI ID: 5030867
• Country of Publication: United States
• Language: English

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