Transcription of Two Stroke Performance Tuning Chapter 3
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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.
Two Stroke Performance Tuning Fig. 3.2: Komet K78 TT porting. Contemporary two-stroke technology was introduced initially to Suzuki, and later to Yamaha in Japan when Ernst Degner defected from East Germany to join Suzuki. By combining designs which Degner brought from MZ with Japanese technology in the field
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