| 摘要 |
A rollerized timing valve lifter for use in high performance engines. It has a press fit hydraulic mechanism utilizing an oil supply feed means from the roller body through and to the hydraulic mechanism. It has structure to maintain a self adjusting lifter to zero valve lash due to engine wear and heat expansion. It further includes a method of altering valve timing automatically through an oil restricted oil bleed passage way leading to the pressure chamber thereby allowing a leak down or delay of valve timing at low speeds. The passageway is narrow enough to become substantially inoperative at high engine speeds to thereby produce effective solid lifter action.
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