Culasse in this context is cylinder head. Google translate is your friend for the rest for the advert . .."We are well aware that one of the great advances in modern technology lies in the development of the turbulence cylinder head favorable to efficiency and greater specific power. We know the bases of the problem following a 'one non-homogeneous air-fuel mixture, not all the fuel burns at the time of explosion, resulting in wasted fuel in the exhaust and significantly reduced power. With the turbulence cylinder head, nothing of the sort to fear .All things remaining equal, the special design of this cylinder head causes swirls of the gas mixture within the combustion chamber; the energetic mixing which results allows the non-vaporized gasoline particles to associate intimately with the pure air, so as to form a much richer mixture which causes an effective explosion with all its happy consequences. The ideal would be to be able to modify an already established type of engine, so as to allow it to benefit from the advantages"
