Inlet tuning of crankcase supercharged four cycle engine

Details Inlet tuning of crankcase supercharged four cycle engine Inlet tuning of crankcase supercharged four cycle engine

1982-12-22

1984-10-09

Burns, Wendell E.

Internal-combustion engines

Four-cycle

Crankcase compression of air or combustible mixture to be...

123318, F02B 7502

Patent

active

044754990

ABSTRACT:
A crankcase supercharged four cycle engine (10) includes an outside air inlet port (22) positioned so that upon each expansion stroke of the piston (11) a discrete pulsed charge of pressurized air is fed to the crankcase (15), and hence from the crankcase through a one-way valve (26) into surge tank (28). The surge tank chamber (29) is connected through a tuning pipe (31) to a manifold volume chamber (34) leading to the air intake (20) of the engine cylinder (12). The tuning pipe is designed with the correct length and volume to provide a resonant frequency which increases engine torque at low speed. The construction provides a closed loop connection (24) between the crankcase and engine cylinder which is subjected to air pressure pulses which are directly responsive to the frequency of reciprocation of the piston. A pressure multiplier effect is obtained within the loop to substantially increase the pressure of air ultimately fed to the cylinder.

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