INTRODUCING SCHUBECK FLAT HYDRAULIC LIFTERS

All of the proprietary material technology used to produce Schubeck solid lifters, applies to the flat hydraulic lifter as well.  Besides taking advantage of the reduced friction, with no wear and no break-in required, our hydraulic lifters have two additional benefits:  1.  A RPM increase, because they will not pump-up, and 2.  Lost power is regained because leak down is no longer a problem.

We all know that lifters pump up, causing the valves to hang open, which in turn, puts a lid on the engine's rev ability. The Rev limit usually starts around 6,000 RPM.

Schubeck “Zero Lash” Hydraulic lifters are a drop-in prevention for the pump-up problem because Zero Lash means no preloading the hydraulic travel. Preloading sets the stage for lifters to pump up, which is like an RPM  limiting governor.  Schubeck lifters are produced using a more substantial snap ring and snap ring groove, to better resist the upward movement of the push rod seat during the pump up attempt. The valve lash, having been set at zero instead of a preload, cannot be influenced by the process and is stopped short by the snap ring.  The engines' rpm limit will increase, similar to one having solid lifters.

Loss of power from "Leak down” occurs when the valves lose lift because the lifters fail to support the open valves against the spring pressure.  Oil bleeding past the hydraulic piston in the lifter, usually caused by a worn check ball or debris in the oil, will allow the hydraulic portion of the lifter to leek down.  When multiplied by the rocker arm ratio, as much as .100, in valve lift can be lost.  You never know when it occurs or how bad you may have this power robbing engine cancer, but we do know how it can be prevented. Schubeck hydraulic lifters restrict plunger travel, limiting the leak down to between .010-.012; if it occurs at all.