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Miscellaneous variants of the VAM motor in 3-D.

Spark ignition engine with variable compression ratios, having 4 groups of 2 cylinders and a compression ratio variation programmed in function of the fuel octane number.
Spark ignition engine with variable compression ratios, having 2 groups of 2 cylinders and a compression ratio variation programmed in function of the fuel octane number.
Compression ignition engine (diesel engine) with variable compression ratios, having 4 groups of 2 cylinders and a compression ratio variation programmed in function of the fuel cetane number.
Polyvalent spark and compression ignition engine with variable compression ratios, having 4 groups of 2 cylinders and two types of compression ratio variations programmed in function of the fuel octane and cetane numbers.