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Exhaust timing control device for two-cycle engine

  • US 5,878,702 A
  • Filed: 08/01/1989
  • Issued: 03/09/1999
  • Est. Priority Date: 08/02/1988
  • Status: Expired due to Fees
First Claim
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1. An exhaust port system for an internal combustion engine comprising a main exhaust port for discharging combustion products from said engine, an auxiliary exhaust port for discharging combustion products from said engine, means for sequentially opening and closing said exhaust ports during a complete cycle of engine operation, an auxiliary exhaust port control means for selectively opening and closing an auxiliary exhaust passage communicating with said auxiliary exhaust port in response to an engine condition for selectively precluding combustion products from flowing through said auxiliary exhaust port even when said auxiliary port is open, and means for retarding the effective timing of the opening of said main exhaust port upon the operation of said auxiliary exhaust port control means for providing a smooth power curve.

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