公开(公告)号：US10648399B2

公开(公告)日：2020-05-12

申请号：US15723846

申请日：2017-10-03

Applicant: POLARIS INDUSTRIES INC.

Inventor： James A Barczak ,  Lawrence J. Hosaluk ,  Dallas J. Blake ,  Darren J. Hedlund

IPC: F02B25/20 ,  F02B75/02 ,  F02B25/14 ,  F02B27/04 ,  F02B33/04 ,  F02F1/24 ,  F02F1/22

Abstract: A two cycle engine having a block defining an exhaust port and a cylinder, a head, and a piston defining a combustion chamber is disclosed. The exhaust port has a resonant frequency that causes a portion of the combusted and uncombusted exhaust gasses to flow from the exhaust system and back into the combustion chamber. At a speed above the predetermined speed, a majority of the portion of the combusted and uncombusted exhaust gasses flows from the exhaust system and back into the combustion chamber without engaging the skirt of the piston.

公开(公告)号：US20190101050A1

公开(公告)日：2019-04-04

申请号：US15723846

申请日：2017-10-03

Applicant: POLARIS INDUSTRIES INC.

Inventor： James A Barczak ,  Lawrence J. Hosaluk ,  Dallas J. Blake ,  Darren J. Hedlund

IPC: F02B25/20 ,  F02B75/02 ,  F02F1/24 ,  F02B25/14

Abstract: A two cycle engine having a block defining an exhaust port and a cylinder, a head, and a piston defining a combustion chamber is disclosed. The exhaust port has a resonant frequency that causes a portion of the combusted and uncombusted exhaust gasses to flow from the exhaust system and back into the combustion chamber. At a speed above the predetermined speed, a majority of the portion of the combusted and uncombusted exhaust gasses flows from the exhaust system and back into the combustion chamber without engaging the skirt of the piston.