DIFF Subgroup
F02B 31/087 Full Title
Modifying induction systems for imparting a rotation to the charge in the cylinder (air intakes or induction systems for internal-combustion engines F02M35/10) > having multiple air inlets
F02B 31/087 Modifying induction systems for imparting a rotation to the charge in the cylinder (air intakes or induction systems for internal-combustion engines F02M35/10) > having multiple air inlets