The engine was designed in Britain by Harry Ricardo, who had a good reputation for designing high-performance engines. The choice of Harry Ricardo was due not only to his reputation but to the fact that the Portello factory was busy producing engines for trucks and airplanes. The result was a square engine with bore and stroke, displacement with 2x 2-stage compressors and 2x triple inverted carburetors.AlfaSport Club: AlfaSport Club, accessdate: 4. July 2017 The engine was tested on a test bench in the spring of 1940 and delivered at 7,800 rpm.
