Mechanical compression release

A compression release mechanism for relieving compression during engine starting in an internal combustion engine having a camshaft rotatably disposed within a housing, the camshaft having inboard and outboard cams and a cam gear disposed thereon, said mechanism comprising:

• a flyweight having a hub extending substantially perpendicularly therefrom, a non-cylindrically shaped bore disposed in said hub;
• and
• a release pin disposed substantially axially parallel to the camshaft, said release pin including a first end having a shape corresponding to said bore, said first end received in said bore, said release pin having a lift member disposed at a second end thereof, said lift member adapted to selectively engage a valve actuation device, wherein the release pin includes an annular groove within which a retaining ring is received to thereby retain the release pin in the compression release mechanism.

A compression release mechanism for relieving compression during engine starting in an internal combustion engine having a camshaft rotatably disposed within a housing, the camshaft having inboard and outboard cams and a cam gear disposed thereon, said mechanism comprising:

• a one-piece flyweight having a hub extending substantially perpendicularly therefrom, a bore disposed in said hub;
• and
• a release pin including a first end having a shape matching said bore, said first end received in said bore, said release pin having a lift member disposed at a second end thereof, said lift member adapted to selectively engage a valve actuation device, said release pin rotatably disposed through the inboard and outboard cams, wherein the release pin includes an annular groove within which a retaining ring is received to thereby retain the release pin in the compression release mechanism.

A compression release mechanism for relieving compression during engine starting in an internal combustion engine having a camshaft rotatably disposed within a housing, the camshaft having inboard and outboard cams and a cam gear disposed thereon, said mechanism comprising:

• a one-piece flyweight having a hub extending substantially perpendicularly therefrom, a bore disposed in said hub;
• and
• a release pin including a first end having a shape matching said bore, said first end received in said bore and secured therein by crimping a portion of the hub against the first end of the release pin, said release pin having a lift member disposed at a second end thereof, said lift member adapted to selectively engage a valve actuation device, said release pin rotatably disposed through the inboard and outboard cams.