Two Stroke Performance Tuning Chapter 3

Two Stroke Performance Tuning Chapter 3 porting and Cylinder Scavenging TODAY, when we take a look down the cylinder of a two- Stroke engine, we find its walls literally filled with ports to handle the induction, transfer and exhaust phases of gas flow through the engine. Those of us who have grown up in the Japanese two- Stroke era take it for granted that every cylinder has a huge exhaust port flanked by anything from four to six transfer ports' However, it hasn't always been this way. As far back as 1904 Alfred Scott patented his original two- Stroke vertical twin. Then in 1906 the French Garard motor appeared with a rotary disc inlet valve. Scott also developed a rotary valve engine in 1912, winning the Senior TT in that year and the following year.

1938. This led to the development of a 125 single employing a porting arrangement originally invented for two-stroke diesels by German engineer Dr.E.Schneurle. It was this concept which ultimately brought success to the two-stroke, both as an economical power source for transport and as a powerful, light-weight power source for competition.

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