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Figure 1

This figure represent a partial longitudinal sectional view of a four-stroke engine having a variable volume combustion chamber with a ratio of 5 between the paired cylinders, shown in the start-of-travel position of the variably timed transmission, at the end of the compression phase.

it also shows helical splines mated between the first and third concentric members, having circular helixes contrary to those of the helical splines mated between the second and third concentric members.

Figure 2
This figure is an exploded view of the engine according to figure 1, showing the variably timed transmission removed from the two crankshafts.
Figure 3
This figure represents the engine shown in figure 1, according to an alternative embodiment of the invention, and shows in detail straight splines mated between the first and third concentric members and helical splines mated between the second and third concentric members.

Figures 01-03 Figures 04-09 Figures 10-11