Adjustable fast bleed lifter

Details Adjustable fast bleed lifter Adjustable fast bleed lifter

2006-11-07

2006-11-07

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Tappet

C123S090480, C123S090550

Reexamination Certificate

active

07131411

ABSTRACT:
A limited leak-down variable duration lifter and its adjustment is provided to maximize performance gains at low engine rpm when used with a conventional cam and more particularly with a conventional hi-performance camshaft. The increased performance gains were here-to-for unobtainable with conventional variable duration lifters and the conventional adjustment. By utilizing an adjustable valve train to precisely position the plunger of an accelerated leak variable duration lifter near the bottom of its travel, optimum reductions of lift and duration are achieved without exceeding amounts that would be detrimental to the engine and its valve train. To maintain proper rocker arm geometry, the plunger is positioned closer to its seat in the assembled state by either reengineering the internal dimensions of the lifter, or by providing a spacer or spacers between the plunger and the push rod cup, or plunger and seat.

REFERENCES:
patent: 2941523 (1960-06-01), Bergmann
patent: 3921609 (1975-11-01), Rhoads
patent: 4133332 (1979-01-01), Benson et al.
patent: 4228771 (1980-10-01), Krieg
patent: 4524731 (1985-06-01), Rhoads
patent: 4913106 (1990-04-01), Rhoads
patent: 4977867 (1990-12-01), Rhoads
Unaware of any Non Patent Literature Documents.

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