Pre-combustion cycle pressurisation system
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United States of America Patent
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May 13, 2014
Grant Date -
Apr 26, 2012
app pub date -
Mar 26, 2010
filing date -
Mar 30, 2009
priority date (Note) -
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Abstract
A two stroke internal combustion engine (1) incorporating an asymmetric exhaust port/transfer port inversion device (2) characterized in that the device includes a hollow flap valve (100) adapted to pivot about a hollow pivot shaft (101) between a closed position and an open position wherein pivoting the device (2) to the open position as the piston (3) begins the compression stroke allows the transfer of air to continue after the leading edge of the piston has closed off the exhaust port (105) thereby advancing the timing of the exhaust port closing and extending the duration of air transfer from the crankcase primary compression chamber (103).
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