Two-stroke engine transfer ports

Details Two-stroke engine transfer ports Two-stroke engine transfer ports

2006-09-05

2006-09-05

Gimie, Mahmoud (Department: 3747)

Internal-combustion engines

Two-cycle

Whirl through piston-controlled ports

C123S0650PE

Reexamination Certificate

active

07100550

ABSTRACT:
A two-stroke internal combustion engine including a cylinder; and a piston movably mounted in the cylinder. The cylinder includes an exhaust port and transfer ports. The transfer ports include a first pair of the transfer ports disposed closer to the exhaust port than a second pair of the transfer ports which are disposed further away from the exhaust port. The first pair of transfer ports are angled relative to each other at a first angle of about 70° to about 85° and the second pair of transfer ports are angled relative to each other at a second angle of about 120° to about 150°. Directional discharge of scavenged air out of the transfer ports10establishes a flow path for the scavenged air to minimize losses of the fresh unburned fuel into the exhaust port.

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