Flat Slide System ST – Complete 41 mm

Complete flat slide system for the Porsche 911 RSR with a diameter of 41 mm.Flat slide systems have been used in Porsche racing vehicles since the 1960s to achieve maximum engine performance.The main advantage of a flat valve system is that when the valve is fully open, the maximum flow values can be achieved with a minimum opening cross section.In contrast to a throttle valve system, neither a vertical flap nor a shaft or screws interfere here, which on the one hand reduce the usable flow cross section and on the other hand can introduce unwanted turbulence into the gas column.This in turn has the advantage of being able to achieve higher flow values despite the reduced cross-section, which can always be directly converted into performance.Furthermore, the mass of the gas column is reduced due to the smaller cross section, which enables an additional increase in performance due to the vibration behavior of the gas column.Flow measurements in our house have shown a flow value reduction of less than 1%.The intake funnels supplied always have exactly the right cross-section, here 41 mm, and due to the extremely high manufacturing quality, there are no annoying edges or transitions when installed.The only disadvantage that a slide system had for a long time could be completely eliminated through complex construction and processing in this system.For a long time this was the high “breakaway torque” from idle to the partial load range, which is a thing of the past with this system.When idling, the high negative pressure below the slide plates led to an increased need for force to open the slide, which suddenly decreases as soon as the negative pressure collapses when the slide is opened.Our systems prevent this completely by guiding the slide plate in hardened industrial needle bearings, which are constructed with such high precision that the high-strength slide plates slide almost frictionlessly in the housing with no contact whatsoever.The housing, in turn, was manufactured using the aluminum sand casting process of the time and is protected against warping and jamming by means of a complex heat treatment, despite different temperature influences.In addition, the surfaces of the raceways of the needle bearings are resistant to wear in a further galvanic hardening process and are therefore maintenance-free.All visual aspects are absolutely true to the original, be it the color and design of the intake funnels and housings, or the covers of the slide linkage made of clear fiberglass plastic.In short, this flat slide system is an authentic new edition of the system that was available from the factory at the time, which we have of course successfully tested in racing, with countless detailed improvements that significantly increase the quality and durability compared to before.