Reciprocating internal combustion engine with balancing and pre-compression, comprising: at least one active cylinder (4); at least one auxiliary cylinder (6), positioned at right-angles to the active cylinder; the throw (2) of the pistons (7, 26) of the relative cylinders positioned on the same drive shaft (1); fuel supply parts (16); the auxiliary cylinder equipped with cylinder head (22) with a one-way valve (23) for air inlet and a one-way valve (24) for air outlet, the cylinder head of the active cylinder (13, 40) having at least one outlet valve (15) and at least one opening (9, 42) for the inlet of the air into the active cylinder; finally, the phase of the piston (26) of the auxiliary cylinder (6) precedes the phase of the piston (7) of the active cylinder (4) by 90 degrees. The description includes two-cylinder versions, two-and four stroke, for petrol and diesels cycles, as well as multi-cylinder and turbocharged versions. |