One-piece lost foam pattern for an intake manifold

Details One-piece lost foam pattern for an intake manifold One-piece lost foam pattern for an intake manifold

1989-08-04

1990-06-05

Okonsky, David A.

Internal-combustion engines

Multiple cylinder

123 73A, F02M 3510

Patent

active

049304615

ABSTRACT:
Disclosed herein is a one-piece foam pattern for an intake manifold for a two cycle internal combustion engine, which pattern comprises a first surface for providing an intake manifold surface adapted to engage an engine block surface and having therein a generally rectangular opening, a second surface extending in generally spaced and parallel relation to the first surface and for providing an intake manifold surface adapted to engage a carburetor mounting surface, which second surface has therein a generally cylindrical opening, and a passage extending between the first and second surfaces and adapted to provide a fuel/air mixture passage in the intake manifold, which passage includes a first portion extending from the rectangular opening in the first surface and having a first transverse surface extending parallel to, and in spaced relation to, the first and second surfaces and having therein a second rectangular opening, which passage also includes a transition portion extending between the circular opening in the second surface and the second rectangular opening and is defined by a semi-cylindrical wall extending from the circular opening in the second surface and including a first axial end at the second surface and a second axial end spaced from the first end, a second wall extending from the second end of the semi-cylindrical wall to the second rectangular opening and in generally parallel relation to the second surface, and a third wall extending from the circular opening and diverging to the second rectangular opening.

REFERENCES:
patent: 4197899 (1980-05-01), Ernest
patent: 4244332 (1981-01-01), Kusche et al.
patent: 4345551 (1982-08-01), Bloemers
patent: 4632169 (1986-12-01), Osborn
patent: 4640333 (1987-02-01), Martin et al.
patent: 4784090 (1988-11-01), Sougawa

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