Inlet port with sharp edge swirl lip

Details Inlet port with sharp edge swirl lip Inlet port with sharp edge swirl lip

1998-12-22

2000-05-02

Argenbright, Tony M.

Metal working

Method of mechanical manufacture

Prime mover or fluid pump making

123306, F02B 3104, B23P 1500

Patent

active

060557273

ABSTRACT:
A cylinder head for an internal combustion engine includes a helical inlet port with a sharp edge swirl lip on a generally cylindrical valve stem recess. The helical inlet port has an inlet passage, a bowl-shaped chamber which has a rim that terminates in an annular valve seat and which encompasses an annular space about a generally cylindrical valve stem guide for a poppet valve stem. One surface of the bowl meets one wall of the inlet passage along a swirl edge, which has a radius of less than about 0.5 mm, and preferably a sharp edge with a radius of less than about 0.1 mm. Such swirl edges may be formed by casting the inlet port with excess material, which is then machined away only within the bowl along a cylindrical cutting line.

REFERENCES:
patent: 4207854 (1980-06-01), Alford et al.
patent: 4366787 (1983-01-01), Gale
patent: 4433651 (1984-02-01), Nakakita et al.

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