v-12 engine with compressed air injection, hand made using traditional methods:12 cm3 of displacement, the diameter of the cylinder is 11,3 mm, the stroke of the pistons 10mm, it works with only 0,1kg/cm2. Is constructed with stainless steel, aluminum and bronze. Patelo dedicates this engine to his grandchildren: Sara, Carmen, Jose and Pablo.This engine is for education, exhibitions, etc., that is the reason to work with compressed air, to avoid contamination. He has made the plans and all parts, except the screws