Two Stroke Performance Tuning Chapter 3 - edj.net
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.
The YZR500 works racer's power valve is controlled electronically by a battery-powered motor, but the TZ500 production machine utilizes a much simpler system. Cables run from the tachometer to a centrifugal governor that raises and lowers the port in harmony with engine rpm. Exhaust duration at …
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