Patent ID: 6213065
Filing Date: 2001-04-10
Classification: F02B,F02D,Y02T

Abstract:
A two-cycle engine exhaust port power regulator comprisingan exhaust port power control assembly;a tongue shoulder attached proximate the top of an engine's combustion cylinder; anda tongue access channel disposed within the shoulder and exhaust port wall;the power control assembly further comprisinga sliding tongue disposed within the access channel and comprising an advancing end and an opposed withdrawing end;a spring biased to advance the tongue within the access channel; anda pneumatic exhaust control piston attached to the withdrawing end of the tongue, disposed to advance and withdraw within a shock absorbing gas pressurizing control cylinder such that as the tongue is withdrawn within the access channel, the control piston is advanced within the control cylinder and that as the tongue is advanced within the access channel, the control piston is withdrawn within the control cylinder;the control piston disposing the control cylinder intoa pneumatic chamber defined by a first face of the control piston disposed upon the withdrawing end thereof, so as to counter the advance tongue biasing of the spring; anda dampening chamber defined by a second face of the control piston disposed upon the advancing end thereof;the dampening chamber comprising a spring abutment zone wherein the spring is disposed to counter the force of the pressurizing gas causing the control piston to withdraw within the control cylinder;the sliding tongue further comprising a pneumatic tunnel communicating with the portion of the exhaust port proximate the tongue's advancing end and with the pneumatic chamber;whereby, upon high powered engine operation wherein relatively high RPM compression forces are present, the tongue is pneumatically caused to withdraw within the access channel, disposing a larger volume of the exhaust port to increase engine exhaust emission, thereby increasing power; and upon low powered operation wherein relatively low RPM compression forces are present, the tongue is caused to advance within the access channel, disposing a smaller volume of the exhaust port to retard engine exhaust emission; thereby enhancing engine performance efficiency throughout the range of operation.