Spanish engineering company Bocanegra Motor has advanced the concept of the internal combustion engine with no connecting rods. Rigidly connected opposed pistons and shuttling “block” that turns crankshaft. The Spanish design overcomes the short-stroke weakness of a comparable, recent Swiss-designed conrod-less engine. A new twist to piston-to-crankshaft connection refines the linear action of the new Spanish design – and rotary valves instead of the usual poppets is another ...

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