How does a bi-fuel engine work?

The twin vertical bank hybrid internal combustion H-engine system comprises an assembly having an engine block with parallel left side and right side vertical inline piston banks. Each has a crankshaft and pistons, a cylinder head and individual fuel feeds operable on a first and second fuel type respectively.
Each piston bank operates independently of the other, but is housed within the same engine block with separate lubrication systems. The car owner selects which bank to run based on fuel availability, convenience or lower cost of a certain fuel type. The chosen engine is mechanically or electrically selected and engages a drive gear on the crankshaft of the selected engine, which transfers power to the transmission. A selector control actuates a transfer system that prevents simultaneous operation of both engines.

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