Induction conduits of internal combustion engines

Claim 1

In a cylinder head for an internal combustion engine including a valve seat, a valve guide and a valve cooperating with the valve guide and valve seat, an induction conduit terminating in the valve seat and including, in the wall of the induction conduit intermediate the valve guide and the valve seat, an appendage projecting into the interior of the conduit and disposed in the radial plane with respect to the longitudinal axis of the valve, said radial plane being inclined at an angle of between 0° and 45° to the transverse axis of the valve parallel to the axis of the engine shaft and the appendage, in plan view having a rectangular cross sectional shape, being delimited laterally by a first surface substantially parallel to said longitudinal axis of the valve and delimited at its end facing the valve seat by a second surface substantially orthogonal to the first, the said second surface being machinable for the selective removal of material to control the degree of turbulence caused by the appendage in the air flowing through the conduit in use thereof.