Power plants – Internal combustion engine with treatment or handling of... – Pulsed – timed – tuned or resonating exhaust
Patent
1990-03-21
1991-09-03
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Pulsed, timed, tuned or resonating exhaust
F02B 2702
Patent
active
050441590
ABSTRACT:
In an exhaust system for two-stroke cycle engines, comprising an exhaust pipe whose front end, which is characterised by a constant cross-section, is followed by two or more conical sections, these conical sections are configured as diffusers, which are connected to the front end of the exhaust pipe with its constant cross-section by means of branch pipes of different length, and which open into a common exhaust header at the other end, which header in turn is connected to the exhaust tail pipe comprising a catalytic converter and/or a silencer. This arrangement has the effect that a pressure wave coming from the cylinder is twice reflected as a suction wave arriving at the still open exhaust port at different times due to the difference in pipe length. In this manner the effective duration of the suction wave is prolonged over that of comparable exhaust systems of a known kind.
REFERENCES:
patent: 4178685 (1979-12-01), Inaga
Alten Hans
Fischer Christof D.
Landfahrer Klaus
Plohberger Diethard
Wojik Karl
AVL Gesellschaft fur Verbrennungskraft-maschinen und Messtechnik
Hart Douglas
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