Faster Burn Rate

Advantageously, the combination of maintaining a pressurized crossover passage and firing after top dead center (ATC) produces an enormous turbulence in the power cylinder just before the initial start of combustion.

This turbulence is further enhanced when the crossover valve is allowed to remain open for a short period of time after the start of combustion (Fig. 7), and closed prior to the flame front propagating up into the crossover passage (Fig. 8).

Figure 7 - Start of Combustion, Crossover Valve Open

Figure 8 - Advance Combustion, Crossover Valve Closed

The massive turbulence results in an extremely fast burn rate. Burn rate (also known as combustion duration) is the amount of time it takes for the trapped fuel/air mixture in the power cylinder to completely combust. It has been well known for some time that burn rate is a powerful multiplier of engine efficiency.

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