Port timing diagram for 2-s SI engines is shown in Figure 6.13.
Figure 6.13 Port Timing Diagram for Two Strokes SI Engines
The timings for ports for 2-s SI engines is summarized in Table 6.4.
Table 6.4 Port Timing for Two Strokes SI Engines
| Position | Actual timing |
|---|---|
| Inlet port opens | 35° before BDC |
| Inlet port closes | 35° after BDC |
| Inlet port is open for | 70° |
| Exhaust port opens | 43° before BDC |
| Exhaust port closes | 43° after BDC |
| Exhaust poet is open for | 86° |
| Overlap | 70° |
| Spark | 20° before TDC |
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